FAN6920 Ver la hoja de datos (PDF) - Fairchild Semiconductor

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componentes Descripción

Fabricante

FAN6920

Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Controller

Fairchild Semiconductor 

Marking Information

16

ZXYTT

FAN6920FO

TPM

1

- Fairchild Logo

Z - Plant Code

X - Year Code

Y - Week Code

TT - Die Run Code

F - Frequency (M = Low, H = High Level)

O - OLP Mode (L = Latch, R = Recovery)

T - Package Type (M = SOP)

P - Y = Green Compound

M - Manufacturing Flow Code

Figure 3. Marking Diagram

Pin Configuration

RANGE

1

COMP

2

INV

3

CSPFC

4

CSPWM

5

OPFC

6

VDD

7

OPWM

8

16

HV

15

N.C.

14

ZCD

13

VIN

12

RT

11

FB

10

DET

9

GND

Figure 4. Pin Configuration

Pin Definitions

Pin # Name Description

The RANGE pin’s impedance changes according to VIN pin voltage level. When the input voltage

1 RANGE detected by the VIN pin is higher than a threshold voltage, it sets to low impedance; whereas it

sets to high impedance if input voltage is at a high level.

Output pin of the error amplifier. It is a transconductance-type error amplifier for PFC output

2

COMP

voltage feedback. Proprietary multi-vector current is built-in to this amplifier; therefore, the

compensation for PFC voltage feedback loop allows a simple compensation circuit between this

pin and GND.

Inverting input of the error amplifier. This pin is used to receive PFC voltage level by a voltage

3

INV divider and provides PFC output over- and under-voltage protections. This pin also controls the

PWM startup. Once the FAN6920MR is turned on and VINV exceeds in 2.3V, PWM starts.

Input to the PFC over-current protection comparator that provides cycle-by-cycle current limiting

4 CSPFC protection. When the sensed voltage across the PFC current-sensing resistor reaches the internal

threshold (0.82V typical), the PFC switch is turned off to activate cycle-by-cycle current limiting.

Input to the comparator of the PWM over-current protection and performs PWM current-mode

control with FB pin voltage. A resistor is used to sense the switching current of the PWM switch

5 CSPWM and the sensing voltage is applied to the CSPWM pin for the cycle-by-cycle current limit, current-

mode control, and high / low line over-power compensation according to DET pin source current

during PWM tON time.

Continued on the following page…

© 2010 Fairchild Semiconductor Corporation

FAN6920MR • Rev. 1.0.3

4

www.fairchildsemi.com

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