SCY99080CDWR2G 데이터 시트보기 (PDF) - ON Semiconductor

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SCY99080CDWR2G

High Performance Switch-Mode Power Supply Controller for Backlight and LLC Converters

ON Semiconductor 

DDA002C

Pin Function Description

Pin No. Pin Name

1

BO

Function

Brown−out

2

CIG

Warm−up time

3

DGS

Synchronous output clamp

4

SS

Soft−start

5

R_Fmin Minimum frequency resistor

6

R_Fmax

Maximum frequency

resistor

7

FB

Optocoupler connection

8

OTP_latch

OTP latch input

9

DT

10

EN1

11

EN2

Dead time

Enable input 1

Enable input 2

12

Lgs

Lower gate signal

13

Hgs

Upper gate signal

14

GND

Ground

15

Lgd

Low−side driver

16

Vcc

Controller Supply

17

HB

Half−Bridge

18

Hgd

High−side driver

19

Boot

High side driver supply line

Pin Description

Detects low input voltage conditions and stops the controller. An internal

current source sets the hysteresis.

A capacitor connected to ground sets the pre−heat time for ballast applica-

tions.

A resistor connected between this pin and ground adjusts the maximum on−

time available on Lgs and Hgs pins.

Monitors the soft−start capacitor voltage to recognize end of the soft−start

period, discharges the soft−start capacitor during any IC restart.

Connecting a resistor between this pin and ground, sets the minimum oscil-

lator frequency reached for VFB ≥ 5.1 V

A resistor connected between this pin and ground sets the maximum fre-

quency excursion reached for VFB ≤ 1.2 V

An optocoupler connected (by collector) between this pin and ground (by

emitter) changes the converter operating frequency. The switching frequency

increases when optocoupler pulls the FB pin down to ground.

If the voltage on this pin decreases below 1.5 V, the circuit latches off. This

pin sources 170 mA current so an NTC resistor can be connected directly to

this pin.

A resistor connected between this pin and ground sets the deadtime

between drivers.

When the voltage level on this pin exceeds a reference level for more than

50 ms, all pulses are stopped and the circuit permanently latches off.

When the voltage level on this pin exceeds a reference voltage, the circuit

stops pulsing. The IC auto−restarts via full startup sequence (PFC delay,

pre−heat, soft−start) when EN2 is released.

Duplicates the lower gate signal for synchronization purposes. On time is

limited based on the Rdgs resistor value.

Duplicates the upper gate signal for synchronization purposes. On time is

limited based on the Rdgs resistor value.

The controller ground

Drives the low−side half−bridge MOSFET

Energizing the controller. This pin accepts voltage up to 20 Vdc

Connects to the half−bridge output

Drives the high−side half−bridge MOSFET

This pin supplies the internal high−side driver

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