Rev. 1.00

2

November 4, 2011

HT7L2102

Block Diagram

Pin Assignment

32V

UVLO

14V / 8V

Internal Bias

& Vref

Green Mode

OSC

LEB

350ns

S

R

Q

Driver

Stage

VREF

VCC

GD

GND

VCC

RT

FB/PDM

ISENSE

TS

OCP Level = 1V

FB Compare Level = 2.5V

Slope

Compensation

3

6

7

2

1

4

5

Soft-Start

Frequency

Jitter

OTP

SCP

OCP

OVP

8

Constant

Current

Controller

Temperature

Sense

107uA

Pin Description

Pin No. Pin Name

Description

1

FB/PDM

Voltage Feedback Pin. Connected to a Photo-Coupler for closed-loop control. This pin also

can be used as a PWM Dimming Pin.

2

TS

Temperature Sense Pin. Connected to an external thermistor as a sense system hot point.

This pin also can be used for an external System-Latch.

3

ISENSE

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

Current Controller uses this voltage information to keep the system output current within a

narrow range.

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

A Temperature-Independent Voltage Reference output.

Absolute Maximum Ratings

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

FB/PDM,RT,ISENSE,TSPins................................................................................................................ -0.3V~5.5V

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

FB /P DM

TS

IS EN SE

RT

VR EF

VC C

GD

GN D

HT 7L 2102

8 SO P- A