Data Sheet

ManualsBrandsON SEMICONDUCTOR ManualsPMICsPMIC - AC/DC converter, offline switcher Half-bridge Frequency control SOP 16

FAN7621S • Rev. 1.0.1 3

FAN7621S — PFM Controller for Half-Bridge Resonant Converters

Pin Configuration

Figure 3. Package Diagram

Pin Definitions

Pin # Name Description

1 HV

This is the supply voltage of the high-side gate-drive circuit IC.

2 CTR This is the drain of the low-side MOSFET. Typically, a transformer is connected to this pin.

3 HO This is the high-side gate driving signal.

4 NC No connection

5 NC No connection

6 AR

This pin is for discharging the external soft-start capacitor when any protection is triggered.

When the voltage of this pin drops to 0.2V, all protections are reset and the controller starts

to operate again.

7 NC No connection

8 R

This pin programs the switching frequency. Typically, an opto-coupler is connected to control

the switching frequency for the output voltage regulation.

9 CS

This pin senses the current flowing through the low-side MOSFET. Typically, negative

voltage is applied on this pin.

10 SG This pin is the control ground.

11 NC No connection

12 LV

This pin is the supply voltage of the control IC.

13 NC No connection

14 LO This is the low-side gate driving signal.

15 NC No connection

16 PG This pin is the power ground. This pin is connected to the source of the low-side MOSFET.

(3) H O

(4) N C

PG (16)

FAN7621S

NC (13)

NC (15)

(5) N C

(6) A R

(7) N C

LO (14)

(12 )

CS (9)

NC (11)

SG (10)

(2) C T R

(1) H V

(8) R