HM9922T [HMSEMI]

High-Voltage LED DRriver with Build-In MOSFET Switch;


型号：	HM9922T
厂家：	H&M Semiconductor
描述：	High-Voltage LED DRriver with Build-In MOSFET Switch
文件：	总6页 (文件大小：483K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

HM9921/HM9922/HM9923

HIGH-VOLTAGE LED DRIVER

WITH BUILD-IN MOSFET SWITCH

HM9921/2/3

FEATURES

SOT-89

TO-92

▪ Operating temperature range -40 ..+85 ºС

▪ ON-resistance of the MOSFET switch

210 Ohm for ambient temperature 25 ºС

1.Drain

2. GND

3. V_DD

▪ OFF-state breakdown voltage of the

MOSFET switch not less 500 V for

Ambient temperature 25 ºC.

1.Drain

2.GND

3.V_DD

ORDERING INFORMATION

Operating

Temperature Range

Device

Package

Packing

HM9921T, HM9922T, HM9923T

HM9921PR, HM9922PR, HM9923PR

TO-92

SOT-89

Tape

Tape & Reel

Т_А= - 40 ... + 85 С

DESCRIPTION

HM9921, HM9922, HM9923 are high-voltage LED driver control ICs with build-in MOSFET switch

and purposed for LED lighting control.

They allow efficient operation of LED strings from voltage sources ranging up to 400VDC.

The HM9921/2 includes an internal high-voltage switching MOSFET controlled with fixed off-time

TOFF of approximately 10µs. The LED string is driven at constant current, thus providing constant

light output and enhanced reliability. The output current is internally fixed at 20mA for HM9921,

50mA for HM9922 and 30mA for HM9923. The peak current control scheme provides good regulation

of the output current throughout the universal AC line voltage range of 85 to 264V AC or DC input

voltage of 20 to 400V.

PIN DESCRIPTION

Pin No

Description

Symbol

This is a drain terminal of the output switching MOSFET and a

linear Regulator input.

Drain

GND

V _DD

This is a common connection for all circuits

This is a power supply pin for all control circuits.

Bypass this pin with a 0.1uF low impedance capacitor.

Shenzhen H&M Semiconductor Co.Ltd

http：//www.hmsemi.com

HM9921/HM9922/HM9923

BLOCK DIAGRAM

V_DD

DRAIN

VT1

REGULATOR

7.5 V

RC-OSCILLATOR

REFERENCE

VOLTAGE

SOURCE

VREF

VT2

FORMER

DELAY LINE

Shenzhen H&M Semiconductor Co.Ltd

http：//www.hmsemi.com

HM9921/HM9922/HM9923

ABSOLUTE MAXIMUM RATINGS

Limit

Unit

Symbol

V_IN

Parameter

Min

-0.3

Max

Input voltage

Low-voltage (control) part of IC supply

voltage

420

V_DD

-0.3

* Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.

These are stress ratings only and functional operation of the device at these or any other conditions beyond those

indicated under “recommended operating conditions” is not implied.

Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

RECOMMENDED OPERATION RANGE

Limit

Symbol

Parameter

Unit

Min

Max

V_IN

Input voltage

400

ELECTRICAL CHARACTERISTICS

Limit

Ambient

Symbol

V_DDR

Parameter

Test Condition

temperature,

Unit

Min

Max

^oC

Regulator output voltage

V_IN= (20- 400)V

5.5

9.0

Low-voltage (control) part

of IC consumption

current

V_DD= 9,5 V

V_IN= 40 V

I_DD

350

210

ON-resistance of the

switch (DRAIN pin)

V_DD= V_DDR

I_DRAIN= 20 mA

R_ON

V_UVLO

I_SAT

Ohm

Undervoltage threshold

(Low-voltage part of IC)

V_DD= V_UVLO

I_DRAIN= 20 mA

V_DDR

0.3

–

4.0

100

25  10

MOSFET saturation

current (DRAIN pin)

V_DD= V_DDR

V_SAT= 50 V

OFF-state breakdown

voltage of the MOSFET

switch (DRAIN pin)

V_BR

V_DD= V_DDR

I_DRAIN= 1 mA

500

Threshold current

HM9921

HM9922

20.5

52.0

30.8

25.5

63.0

38.2

25  10

-40

I_TH

V_DD= V_DDR

V_IN= 50 V

HM9923

OFF time

(DRAIN pin)

T_OFF

T_ON

8.0

13.0

650

Minimum ON-time of the

switch (DRAIN pin)

V_DD= V_DDR

V_IN= 50 V

25  10

Leading Edge Blanking

Delay

T_BLANK

200

400

Shenzhen H&M Semiconductor Co.Ltd

http：//www.hmsemi.com

HM9921/HM9922/HM9923

RECOMMENDED APPLICATION DIAGRAM

AC – AC supply voltage source

С1 – capacitor C= 0.1uF ± 10 %

D1 – microcircuit

L1 – inductor (coil)

Inductor feature L, mH, is calculated by formula:

15NU

L =

dI_O

N – Quantity of diodes in LED string, pcs.;

V_F– LED forward voltage for nominal current, V;

dI_O– LED circuit permissible current ripple, mA

LED₁– LED_N– LEDs (light emitting diodes) with nominal current:

- 20 mA for HM9921 application;

- 50 mA for HM9922 application;

- 30 mA for HM9923 application

VD1 – high-voltage diode with breakdown voltage not less 500V

and forward current:

- not less 25.5 mA for HM9921 application;

- not less 63.0 mA for HM9922 application;

- not less 38.2 mA for HM9923 application

Shenzhen H&M Semiconductor Co.Ltd

http：//www.hmsemi.com

HM9921/HM9922/HM9923

PACKAGE DIMENSION

TO-92

Taping Specification

Shenzhen H&M Semiconductor Co.Ltd

http：//www.hmsemi.com

HM9921/HM9922/HM9923

Shenzhen H&M Semiconductor Co.Ltd

http：//www.hmsemi.com

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