© 2010 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN6921AMR

• Rev. 1.0.2

4

Marking Information

1

- Fairchild Logo

Z - Plant Code

X - Year Code (1-Digit for SOP, 2-Digit for DIP)

Y - Week Code (1-Digit for SOP, 2-Digit for DIP)

TT–Die-Run Code

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

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

T - Package Type (N=DIP, M=SOP)

P - Y:Green Package

M - Manufacture Flow Code

16

ZXYTT

FAN6921AFO

TPM

Figure 3. Marking Diagram

Pin Configuration

GND

DET

FB

RT

VIN

ZCD

NC

HV

OPWM

VDD

OPFC

CSPWM

CSPFC

INV

COMP

RANGE

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Figure 4. Pin Configuration

Pin Definitions

Pin #

Name

Description

1

RANGE

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

detected by the VIN pin is lower than a threshold voltage, it sets to high impedance; whereas it

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

2

COMP

Output pin of the error amplifier. Transconductance-type error amplifier for PFC output 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.

3

INV

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

divider and provides PFC output over- and under-voltage protections.

4

CSPFC

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

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

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

limiting.

5

CSPWM

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

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 the DET pin source

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