LM3423Q0 datasheet(10/65 Pages) TI1

部品番号	LM3423Q0

部品情報	N-Channel Controllers for Constant Current LED Drivers

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IS

AGND

PWM

Start new on time

nDIM

COMP

REFERENCE

CURRENT

LIMIT

CSH

HSN

LOGIC

HSP

EN

OVP

HYSTERESIS

LED CURRENT LOW

S

R

Q

UVLO

DDRV

GATE

PGND

OVP

LRDY

RPD

EN

LatchOff

TIMR

OVLO

FLT

LED CURRENT HIGH

Regulator

Thermal

Limit

TLIM

OVLO

PGND

LatchOff

Standby

Dimming

Reset

Dominant

RCT

800 mV

820k

500k

LEB

In the LM3421, TIMR is internally shorted to AGND.

1.235V

6.9V LDO

(4.1V)

DPOL

Grey pins are available in the LM 3423 only.

LEB

W = 150 ns

VIN/25

VIN UVLO

HYSTERESIS

1.24V

VCC

1.235V

VCC

1.24V

0.245V

1.0V

1.6V

VCC UVLO

VCC

VCC UVLO

VIN

23 PA

11.5 PA

LM3421, LM3421-Q1

LM3423, LM3423-Q1

SNVS574D – JULY 2008 – REVISED SEPTEMBER 2011

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BLOCK DIAGRAM

THEORY OF OPERATION

The LM3421/23 are N-channel MosFET (NFET) controllers for buck, boost and buck-boost current regulators

which are ideal for driving LED loads. The controller has wide input voltage range allowing for regulation of a

variety of LED loads. The high-side differential current sense, with low adjustable threshold voltage, provides an

excellent method for regulating output current while maintaining high system efficiency. The LM3421/23 uses a

Predictive Off-time (PRO) control architecture that allows the regulator to be operated using minimal external

control loop compensation, while providing an inherent cycle-by-cycle current limit. The adjustable current sense

threshold provides the capability to amplitude (analog) dim the LED current and the output enable/disable

10

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Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1

同様の部品番号 - LM3423Q0

メーカー	部品番号	データシート	部品情報
National Semiconductor ...	LM3423Q0	1Mb / 48P	N-Channel Controllers for Constant Current LED Drivers
National Semiconductor ...	LM3423Q0MH	1Mb / 48P	N-Channel Controllers for Constant Current LED Drivers
Texas Instruments	LM3423Q0MH/NOPB	2Mb / 72P	[Old version datasheet] N-Channel Controllers for Constant-Current LED Drivers
National Semiconductor ...	LM3423Q0MHX	1Mb / 48P	N-Channel Controllers for Constant Current LED Drivers
Texas Instruments	LM3423Q0MHX/NOPB	2Mb / 72P	[Old version datasheet] N-Channel Controllers for Constant-Current LED Drivers

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同様の説明 - LM3423Q0

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