{"id":376,"date":"2020-08-13T12:35:05","date_gmt":"2020-08-13T12:35:05","guid":{"rendered":"http:\/\/blog.semibing.com\/?p=376"},"modified":"2025-06-16T03:40:58","modified_gmt":"2025-06-16T03:40:58","slug":"fan7621","status":"publish","type":"post","link":"https:\/\/blog.semibing.com\/index.php\/2020\/08\/13\/fan7621\/","title":{"rendered":"FAN7621BSJX\/FAN7621SJX: Order today,ships in 3 days."},"content":{"rendered":"\r\n
<\/figure>\r\n

2000pcs of FAN7621BSJX or FAN7621SJX in stock for sale ,ON fairchild, new and original<\/strong><\/h3>\r\n
\"FAN7621BSJX<\/figure>\r\n\r\n\r\n\r\n
\"https:\/\/www.semibing.com\/Inquiry\"<\/a>\r\n
Click the red button for inquiry! Thanks<\/figcaption>\r\n<\/figure>\r\n\r\n\r\n\r\n

Brief Introduction of FAN7621BSJX or FAN7621<\/strong><\/p>\r\n\r\n\r\n\r\n

The FAN7621BSJX or FAN7621SJX<\/strong> is a pulse frequency modulation controller for high-efficiency half-bridge resonant converters.Offering everything necessary to build a reliable and robust resonant converter, the FAN7621B simplifies designs and improves productivity, while improving performance. The FAN7621B includes a highside gate-drive circuit, an accurate current controlled oscillator, frequency limit circuit, soft-start, and built-in protection functions. The high-side gate-drive circuit has a common-mode noise cancellation capability, which guarantees stable operation with excellent noise immunity. Using the zero-voltage-switching (ZVS) technique dramatically reduces the switching losses and efficiency is significantly improved. The ZVS also reduces the switching noise noticeably, which allows a small-sized Electromagnetic Interference (EMI) filter. The FAN7621B can be applied to various resonant converter topologies; such as series resonant, parallel resonant, and LLC resonant converters.<\/p>\r\n\r\n\r\n\r\n

Features of FAN7621BSJX or FAN7621<\/strong><\/h2>\r\n\r\n\r\n\r\n
\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Features<\/strong><\/td>\r\n<\/tr>\r\n
\u00a0<\/td>\r\n\u00a0<\/td>\r\n<\/tr>\r\n
Variable Frequency Control with 50% Duty Cycle for Half-bridge Resonant Converter Topology<\/td>\r\n\u00a0<\/td>\r\n<\/tr>\r\n
High Efficiency through Zero Voltage Switching (ZVS)<\/td>\r\n\u00a0<\/td>\r\n<\/tr>\r\n
Fixed Dead Time (350ns)<\/td>\r\n\u00a0<\/td>\r\n<\/tr>\r\n
Up to 300kHz Operating Frequency<\/td>\r\n\u00a0<\/td>\r\n<\/tr>\r\n
Pulse Skipping for Frequency Limit (Programmable) at Light-Load Condition<\/td>\r\n\u00a0<\/td>\r\n<\/tr>\r\n
Remote On\/Off Control using CON Pin<\/td>\r\n\u00a0<\/td>\r\n<\/tr>\r\n
Protection Functions: Over-Voltage Protection (OVP), Overload Protection (OLP), Over-Current Protection (OCP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD)<\/td>\r\n\u00a0<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n
\r\n\r\n\r\n\r\n\r\n
Applications<\/strong><\/td>\r\n<\/tr>\r\n
PDP TV LCD TV Desktop PC Server Video Game Console<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n

FAN7621BSJX FAN7621SJX, PFM CONTROLLER FOR HALF-BRIDGE<\/p>\r\n\r\n\r\n\r\n

Converter Offline Half-Bridge Topology Up to 300kHz 16-SOP<\/p>\r\n\r\n\r\n\r\n

Product Attributes<\/p>\r\n\r\n\r\n\r\n

Categories:\u00a0\u00a0\u00a0\u00a0\u00a0 Integrated Circuits (ICs)<\/p>\r\n\r\n\r\n\r\n

PMIC – AC DC Converters, Offline Switchers\u00a0<\/p>\r\n\r\n\r\n\r\n

Manufacturer:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ON Semiconductor\u00a0<\/p>\r\n\r\n\r\n\r\n

Packaging:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Tape & Reel (TR) \u00a0\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Part Status:\u00a0\u00a0\u00a0\u00a0\u00a0 Active\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Output Isolation:\u00a0\u00a0\u00a0\u00a0 Isolated\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Internal Switch(s):\u00a0\u00a0 No\u00a0\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Voltage – Breakdown\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Topology\u00a0 Half-Bridge\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Voltage – Start Up\u00a0\u00a0\u00a0 12.5V\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Voltage – Supply (Vcc\/Vdd)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 10V ~ 25V\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Duty Cycle\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 50%<\/p>\r\n\r\n\r\n\r\n

Frequency – Switching\u00a0\u00a0\u00a0\u00a0\u00a0 Up to 300kHz\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Power (Watts) 192W\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Fault Protection\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Current Limiting, Over Load, Over Temperature, Over Voltage\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Control Features\u00a0\u00a0\u00a0\u00a0\u00a0 Frequency Control\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Operating Temperature\u00a0 -40\u00b0C ~ 130\u00b0C (TJ)\u00a0\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Package \/ Case\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 16-SOIC (0.209″, 5.30mm Width)\u00a0\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Supplier Device Package 16-SOP\u00a0\u00a0\u00a0\u00a0<\/p>\r\n\r\n\r\n\r\n

Mounting Type:Surface MountFAN7621B \u2014 PFM Controller for Half-Bridge Resonant Converters<\/p>\r\n\r\n\r\n\r\n

FAN7621B<\/p>\r\n\r\n\r\n\r\n

PFM Controller for Half-Bridge Resonant Converters<\/p>\r\n\r\n\r\n\r\n

FAN7621BSJX or FAN7621SJX<\/strong> \u00a0Features:<\/p>\r\n\r\n\r\n\r\n

1,Variable Frequency Control with 50% Duty Cycle<\/p>\r\n\r\n\r\n\r\n

for Half-bridge Resonant Converter Topology<\/p>\r\n\r\n\r\n\r\n

2,\u00a0 High Efficiency through Zero Voltage Switching (ZVS)<\/p>\r\n\r\n\r\n\r\n

3,\u00a0 Fixed Dead Time (350ns)<\/p>\r\n\r\n\r\n\r\n

4,\u00a0 Up to 300kHz Operating Frequency<\/p>\r\n\r\n\r\n\r\n

5, Pulse Skipping for Frequency Limit (Programmable)<\/p>\r\n\r\n\r\n\r\n

at Light-Load Condition<\/p>\r\n\r\n\r\n\r\n

6,\u00a0 Remote On\/Off Control using CON Pin<\/p>\r\n\r\n\r\n\r\n

7,\u00a0 Protection Functions: Over-Voltage Protection<\/p>\r\n\r\n\r\n\r\n

(OVP), Overload Protection (OLP), Over-Current<\/p>\r\n\r\n\r\n\r\n

Protection (OCP), Abnormal Over-Current Protection<\/p>\r\n\r\n\r\n\r\n

(AOCP), Internal Thermal Shutdown (TSD)<\/p>\r\n\r\n\r\n\r\n

Applications<\/p>\r\n\r\n\r\n\r\n

8, PDP and LCD TVs<\/p>\r\n\r\n\r\n\r\n

9, Desktop PCs and Servers<\/p>\r\n\r\n\r\n\r\n

10, Adapters<\/p>\r\n\r\n\r\n\r\n

11,\u00a0 Telecom Power Supplies<\/p>\r\n\r\n\r\n\r\n

12, Video Game Consoles<\/p>\r\n\r\n\r\n\r\n

The FAN7621BSJX FAN7621SJX is a pulse frequency modulation,<\/p>\r\n\r\n\r\n\r\n

controller\u00a0 for\u00a0 high-efficiency\u00a0 half-bridge\u00a0 resonant<\/p>\r\n\r\n\r\n\r\n

converters. Offering everything necessary to build a<\/p>\r\n\r\n\r\n\r\n

reliable and robust resonant converter, the FAN7621B<\/p>\r\n\r\n\r\n\r\n

simplifies designs and improves productivity, while<\/p>\r\n\r\n\r\n\r\n

improving performance. The FAN7621B includes a high-<\/p>\r\n\r\n\r\n\r\n

side gate-drive circuit, an accurate current controlled<\/p>\r\n\r\n\r\n\r\n

oscillator, frequency limit circuit, soft-start, and built-in<\/p>\r\n\r\n\r\n\r\n

protection functions. The high-side gate-drive circuit has<\/p>\r\n\r\n\r\n\r\n

a common-mode noise cancellation capability, which<\/p>\r\n\r\n\r\n\r\n

guarantees\u00a0 stable\u00a0 operation with excellent noise<\/p>\r\n\r\n\r\n\r\n

immunity.\u00a0 Using\u00a0 the\u00a0 zero-voltage-switching\u00a0 (ZVS)<\/p>\r\n\r\n\r\n\r\n

technique dramatically reduces the switching losses and<\/p>\r\n\r\n\r\n\r\n

efficiency is significantly improved. The ZVS also<\/p>\r\n\r\n\r\n\r\n

reduces the switching noise noticeably, which allows a<\/p>\r\n\r\n\r\n\r\n

small-sized Electromagnetic Interference (EMI) filter.<\/p>\r\n\r\n\r\n\r\n

The FAN7621B can be applied to various resonant<\/p>\r\n\r\n\r\n\r\n

converter topologies; such as series resonant, parallel<\/p>\r\n\r\n\r\n\r\n

resonant, and LLC resonant converters.<\/p>\r\n\r\n\r\n\r\n

Related Resources<\/p>\r\n\r\n\r\n\r\n

AN4151 \u2014 Half-bridge LLC Resonant Converter Design<\/p>\r\n\r\n\r\n\r\n

using FSFR-series Fairchild Power Switch (FPS TM )<\/p>\r\n\r\n\r\n\r\n

FAN7621BSJ<\/p>\r\n\r\n\r\n\r\n

-40\u00b0C ~ 130\u00b0C\u00a0 16-Lead Small Outline Package (SOP)<\/p>\r\n\r\n\r\n\r\n

-50 -25 0 25 50 75 100<\/p>\r\n\r\n\r\n\r\n

Temp ( O C)<\/p>\r\n\r\n\r\n\r\n

Normalized at 25 O C<\/p>\r\n\r\n\r\n\r\n

Figure 14. CON Pin Enable Voltage vs. Temperature\u00a0 Figure 15. OCP Voltage vs. Temperature<\/p>\r\n\r\n\r\n\r\n

\u00a9 2009 Fairchild Semiconductor Corporation\u00a0 www.fairchildsemi.com<\/p>\r\n\r\n\r\n\r\n

FAN7621B \u2022 Rev. 1.0.1\u00a0 9<\/p>\r\n\r\n\r\n\r\n

FAN7621B \u2014 PFM Controller for Half-Bridge Resonant Converters<\/p>\r\n\r\n\r\n\r\n

Functional Description<\/p>\r\n\r\n\r\n\r\n

1. Basic Operation: FAN7621B is designed to drive<\/p>\r\n\r\n\r\n\r\n

high-side and low-side MOSFETs complementarily with<\/p>\r\n\r\n\r\n\r\n

50% duty cycle. A fixed dead time of 350ns is introduced<\/p>\r\n\r\n\r\n\r\n

between consecutive transitions, as shown in Figure 16.<\/p>\r\n\r\n\r\n\r\n

High-side<\/p>\r\n\r\n\r\n\r\n

MOSFET<\/p>\r\n\r\n\r\n\r\n

gate drive<\/p>\r\n\r\n\r\n\r\n

Low-side<\/p>\r\n\r\n\r\n\r\n

MOSFET<\/p>\r\n\r\n\r\n\r\n

gate drve<\/p>\r\n\r\n\r\n\r\n

Dead time<\/p>\r\n\r\n\r\n\r\n

time<\/p>\r\n\r\n\r\n\r\n

Figure 16. MOSFETs Gate Drive Signal<\/p>\r\n\r\n\r\n\r\n

2. Internal Oscillator: FAN7621B employs a current-<\/p>\r\n\r\n\r\n\r\n

controlled oscillator, as shown in Figure 17. Internally,<\/p>\r\n\r\n\r\n\r\n

the voltage of R T pin is regulated at 2V and the charging<\/p>\r\n\r\n\r\n\r\n

\/ discharging current for the oscillator capacitor, C T , is<\/p>\r\n\r\n\r\n\r\n

obtained by copying the current flowing out of R T\u00a0 pin<\/p>\r\n\r\n\r\n\r\n

(I CTC ) using a current mirror. Therefore, the switching<\/p>\r\n\r\n\r\n\r\n

frequency increases as I CTC increases.<\/p>\r\n\r\n\r\n\r\n

Figure 17. Current Controlled Oscillator<\/p>\r\n\r\n\r\n\r\n

3. Frequency Setting: Figure 18 shows the typical<\/p>\r\n\r\n\r\n\r\n

voltage gain curve of a resonant converter, where the<\/p>\r\n\r\n\r\n\r\n

gain is inversely proportional to the switching frequency<\/p>\r\n\r\n\r\n\r\n

in the ZVS region. The output voltage can be regulated<\/p>\r\n\r\n\r\n\r\n

by modulating the switching frequency. Figure 19 shows<\/p>\r\n\r\n\r\n\r\n

the typical circuit configuration for R T pin, where the<\/p>\r\n\r\n\r\n\r\n

opto-coupler transistor is connected to the R T pin to<\/p>\r\n\r\n\r\n\r\n

modulate the switching frequency.<\/p>\r\n\r\n\r\n\r\n

Figure 21. Internal Block of Control Pin<\/p>\r\n\r\n\r\n\r\n

Protection: When the control pin voltage exceeds 5V,<\/p>\r\n\r\n\r\n\r\n

protection\u00a0 is\u00a0 triggered.\u00a0 Detailed\u00a0 applications\u00a0 are<\/p>\r\n\r\n\r\n\r\n

described in the protection section.<\/p>\r\n\r\n\r\n\r\n

Pulse Skipping: FAN7621B stops switching when the<\/p>\r\n\r\n\r\n\r\n

control pin voltage drops below 0.4V and resumes<\/p>\r\n\r\n\r\n\r\n

switching when the control pin voltage rises above 0.6V.<\/p>\r\n\r\n\r\n\r\n

To use pulse-skipping, the control pin should be<\/p>\r\n\r\n\r\n\r\n

connected to the opto-coupler collector pin.<\/p>\r\n\r\n\r\n\r\n

\u00a9 2009 Fairchild Semiconductor Corporation\u00a0 www.fairchildsemi.com<\/p>\r\n\r\n\r\n\r\n

FAN7621B \u2022 Rev. 1.0.1\u00a0 13<\/p>\r\n\r\n\r\n\r\n

FAN7621B \u2014 PFM Controller for Half-Bridge Resonant Converters<\/p>\r\n\r\n\r\n\r\n

6. PCB Layout Guideline: Duty imbalance problems<\/p>\r\n\r\n\r\n\r\n

may occur due to the radiated noise from main<\/p>\r\n\r\n\r\n\r\n

transformer, the inequality of the secondary-side leakage<\/p>\r\n\r\n\r\n\r\n

inductances of main transformer, and so on. Among<\/p>\r\n\r\n\r\n\r\n

them, it is one of the dominant reasons that the control<\/p>\r\n\r\n\r\n\r\n

components in the vicinity of R T pin are enclosed by the<\/p>\r\n\r\n\r\n\r\n

primary current flow pattern on PCB layout. The direction<\/p>\r\n\r\n\r\n\r\n

of the magnetic field on the components caused by the<\/p>\r\n\r\n\r\n\r\n

primary current flow is changed when the high-and-low<\/p>\r\n\r\n\r\n\r\n

side MOSFET turns on by turns. The magnetic fields with<\/p>\r\n\r\n\r\n\r\n

opposite direction from each other induce a current<\/p>\r\n\r\n\r\n\r\n

through, into, or out of the R T pin, which makes the turn-<\/p>\r\n\r\n\r\n\r\n

on duration of each MOSFET different. It is strongly<\/p>\r\n\r\n\r\n\r\n

recommended to separate the control components in the<\/p>\r\n\r\n\r\n\r\n

vicinity of R T pin from the primary current flow pattern on<\/p>\r\n\r\n\r\n\r\n

PCB layout. Figure 28 shows an example for the duty-<\/p>\r\n\r\n\r\n\r\n

balanced case. The yellow and blue lines show the<\/p>\r\n\r\n\r\n\r\n

primary current flows when the lower-side and higher-<\/p>\r\n\r\n\r\n\r\n

side MOSFETs turns on, respectively. The primary<\/p>\r\n\r\n\r\n\r\n

current does not enclose any component of controller.<\/p>\r\n\r\n\r\n\r\n

In addition, it is helpful to reduce the duty imbalance to<\/p>\r\n\r\n\r\n\r\n

make the loop configured between CON pin and opto-<\/p>\r\n\r\n\r\n\r\n

coupler as small as possible, as shown in the red line in<\/p>\r\n\r\n\r\n\r\n

Figure 28.<\/p>\r\n\r\n\r\n\r\n

Figure 28. Example for Duty Balancing<\/p>\r\n\r\n\r\n\r\n

\u00a9 2009 Fairchild Semiconductor Corporation\u00a0 www.fairchildsemi.com<\/p>\r\n\r\n\r\n\r\n

FAN7621B \u2022 Rev. 1.0.1\u00a0 14<\/p>\r\n\r\n\r\n\r\n

FAN7621B \u2014 PFM Controller for Half-Bridge Resonant Converters<\/p>\r\n\r\n\r\n\r\n

Typical Application Circuit (Half-Bridge LLC Resonant Converter)<\/p>\r\n\r\n\r\n\r\n

Application\u00a0 Device\u00a0 Input Voltage Range\u00a0 Rated Output Power<\/p>\r\n\r\n\r\n\r\n

Output Voltage<\/p>\r\n\r\n\r\n\r\n

(Rated Current)<\/p>\r\n\r\n\r\n\r\n

LCD TV\u00a0 FAN7621B<\/p>\r\n\r\n\r\n\r\n

390V DC<\/p>\r\n\r\n\r\n\r\n

(340~400V DC )<\/p>\r\n\r\n\r\n\r\n

192W\u00a0 24V-8A<\/p>\r\n\r\n\r\n\r\n

Features<\/p>\r\n\r\n\r\n\r\n

High efficiency ( >94% at 400V DC input)<\/p>\r\n\r\n\r\n\r\n

Reduced EMI noise through zero-voltage-switching (ZVS)<\/p>\r\n\r\n\r\n\r\n

Enhanced system reliability with various protection functions<\/p>\r\n\r\n\r\n\r\n

FAN7621<\/p>\r\n\r\n\r\n\r\n

FAN7621B \u2014 PFM Controller for Half-Bridge Resonant Converters<\/p>\r\n\r\n\r\n\r\n

Typical Application Circuit\u00a0 (Continued)<\/p>\r\n\r\n\r\n\r\n

Usually, LLC resonant converters require large leakage inductance value. To obtain a large leakage inductance,<\/p>\r\n","protected":false},"excerpt":{"rendered":"

Brief Introduction of FAN7621BSJX or FAN7621 The FAN762 […]<\/p>\n","protected":false},"author":1,"featured_media":377,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[19],"tags":[322],"yoast_head":"\nFAN7621BSJX\/FAN7621SJX: Order today,ships in 3 days. - 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