FAN6747 データシートの表示（PDF） - Fairchild Semiconductor

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FAN6747

Highly Integrated Green-Mode PWM Controller

Fairchild Semiconductor 

Marking Information

ZXYTT

6747F

TPM

Pin Configuration

: Fairchild Logo

Z: Plant Code

X: Year Code

Y: Week Code

TT: Die Run Code

F: L = OCP latch

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

P: Y = Green Compound

M: Manufacturing Flow Code

Figure 3. Top Mark

Pin Definitions

Figure 4. Pin Assignments

Pin #

1

2

3

4

5

6

7

8

Name

GND

FB

NC

HV

RT

SENSE

VDD

GATE

Description

Ground. This pin is used for the ground potential of all the pins. A 0.1µF decoupling capacitor

placed between VDD and GND is recommended.

Feedback. The output voltage feedback information from the external compensation circuit is fed

into this pin. The PWM duty cycle is determined from this pin and the current-sense signal from

Pin 6.

No Connection.

High-Voltage Startup. This pin is connected to the line input via diodes and resistors to achieve

brownout and high/low line compensation. Once the voltage of the HV pin is lower than the

brownout voltage, PWM output is turned off. High/low line compensation dominates the OCP

level and cycle-by-cycle current limit, to solves the unequal OCP level and power limit problem

under universal input.

Over-Temperature Protection. For over-temperature protection, an external NTC thermistor is

connected from this pin to GND. The impedance of the NTC decreases at high temperatures.

Once the voltage of the RT pin drops below the threshold voltage, the controller latches off the

PWM. If the RT pin is not connected to the NTC resistor for over temperature protection, it is

recommended to connect one 100KΩ resistor to ground to prevent noise interference. This pin is

limited by internal clamping circuit.

Current Sense. This pin is used to sense the MOSFET current for the current mode PWM and

OCP. If the switching current is higher than OCP threshold and lasts 220ms, the controller

latches off the PWM.

Supply Voltage. IC operating current and MOSFET driving current are supplied using this pin.

This pin is connected to an external bulk capacitor of typically 10µF. The threshold voltages for

startup and turn-off are 16.5V and 9V, respectively. The operating current is lower than 2mA.

Gate Driver Output. The totem-pole output driver for the power MOSFET. It is internally

clamped below 14V.

© 2010 Fairchild Semiconductor Corporation

FAN6747 • Rev. 1.0.3

3

www.fairchildsemi.com

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