Rev. 1.10

2

July 17, 2013

HT7A6005

Block Diagram

Pin Assignment

32V

UVLO

14V / 8V

Internal Bias

& Vref

Trimmed

OSC

OCP Output

LEB

350ns

S

R

Q

Driver

Stage

8

VREF

VCC

GD

GND

VCC

RT

COMP/FB

CS

MF

OCP Level = 1V

FB Compare

Level = 2.5V

Slope

Compensation

3

6

7

2

1

4

5

Mixed-Mode/Analog

Interface

Pin Description

Pin No.

Pin Name

Description

1

COMP/FB Voltage Feedback Pin, Connected to a system voltage feedback point.

2

MF

Multi-Function Pin. By connecting this pin to different system sensing points, the device

can be used for different circuit topologies such as Isolation Flyback or Non-Isolation DC-

DC Buck/Boost.

3

CS

A voltage proportional to the inductor current is connected to this input. The PWM

generator uses this voltage to terminate output switching.

4

RT

The oscillator frequency is programmed by connecting a resistor, RT, between this pin and

ground. A maximum frequency of 500kHz is possible.

5

GND

Combined control circuitry and power ground.

6

GD

Power MOSFET gate driver output.

7

VCC

Positive Supply.

8

VREF

Temperature-independent voltage reference output.

Absolute Maximum Ratings

SupplyVoltageVCC................................................................................................................................ -0.3V~30.0V

COMP/FB,RT,CS,MFPins..................................................................................................................... -0.3V~5.0V

JunctionTemperature.......................................................................................................................................... 150°C

OperatingAmbientTemperature............................................................................................................... -40°C~85°C

StorageTemperatureRange.................................................................................................................... -65°C~150°C

PackageThermalResistance(8-PinSOP)..................................................................................................... 160°C/W

ESDProtection:

HumanBodyModel.......................................................................................................................................3kV

MachineModel............................................................................................................................................200V

Note:Thesearestressratingsonly.Stressesexceedingtherangespecifiedunder“AbsoluteMaximumRatings”

maycausesubstantialdamagetothedevice.Functionaloperationofthisdeviceatotherconditionsbeyond

thoselistedinthespecificationisnotimpliedandprolongedexposuretoextremeconditionsmayaffect

devicereliability.

1

2

3

4

8

7

6

5

CO MP /F B

MF

CS

RT

VR EF

VC C

GD

GN D

HT 7A 600 5

8 SO P- A