FL7734 查看數據表（PDF） - Fairchild Semiconductor

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FL7734

Single-Stage Primary-Side-Regulation PWM Controller for PFC and Phase Cut Dimmable LED Driving

Fairchild Semiconductor 

Marking Information

ZXYTT

7734

TPM

F: Fairchild Logo

Z: Plant Code

X: 1-Digit Year Code

Y: 1-Digit Week Code

TT: 2-Digit Die Run Code

T: Package Type (M=SOP)

P: Z: Pb free, Y: Green package

M: Manufacture Flow Code

Figure 3. Top Mark

Pin Configuration

VS 1

TCIC 2

MOD 3

HOLD 4

DIM 5

FB 6

MBLD 7

SG 8

Figure 4.

16 VDD

15 PG

14 GATE

13 CS

12 BIAS

11 BLD

10 RBLD

9 VIN

Pin Configuration

Pin Definitions

Pin #

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Name

Description

VS

Voltage Sense. VS pin detects the output voltage for linear frequency control and discharge

time for output current regulation. VS voltage detection protects LED open and short conditions.

TCIC Constant Input Current. TCIC manages switching mode control.

MOD Modulation. Min. FB is clamped by MOD voltage.

HOLD Holding Current. External HOLD resistor sets the level of constant input current.

DIM

Phase Angle Sense. DIM voltage indicates the amount of phase angle. It is the reference

voltage of the error amplifier in the feedback loop.

FB Feedback. FB is the output of the error amplifier.

MBLD Maximum Bleeding. Resistor connected to MBLD determines maximum bleeding current.

SG Signal Ground.

VIN Input Voltage Sense. VIN pin detects input voltage for phase angle detection.

RBLD

Bleeding Control Resistor. RBLD current set by external resistor decides the amount of

bleeding current.

BLD Bleeding Control. BLD flows current into RBLD.

BIAS

Bleeding Circuit BIAS. External bleeding switch is biased by an internal clamping circuit via

BIAS pin.

Current Sense. CS pin connects a current-sense resistor to detect the MOSFET current for the

CS output current regulation. Over-current protection and sensing resistor short protection are

triggered by this pin.

GATE PWM Signal Output. Gate driver in this pin switches power MOSFET.

PG Power Ground.

VDD

Power Supply. Connects to a decoupling capacitor. IC operating current and MOSFET driving

current are supplied from this pin.

© 2014 Fairchild Semiconductor Corporation

FL7734 • Rev. 1.0

3

www.fairchildsemi.com

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