LD5857GS datasheet(5/12 Pages) LEADTREND

5 / 12 page

LD5857

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD5857-DS-00 April 2014

Electrical Characteristics

(VCC=12V, TA=25C, unless otherwise noted.)

PARAMETER

CONDITIONS

Symbol

MIN.

TYP.

MAX.

UNITS

Input Power (VCC)

Turn On Level

UVLO(on)

UVLO_ON

8.7

Turn Off Level

UVLO(off)

UVLO_OFF

Shutdown Current

DIM=Low, over 30ms

IOFFVIN

A

Operating Current

DIM=High,

Switching at no load

IQVIN

Boost Converter

Switching Frequency

FSW

180

200

220

KHz

Boost Maximum Duty Cycle

Switching frequency=200KHz

DMAX

DRV Gate Drive

Source current, VIN=12V

CR_DRV

1.2

Sink current, VIN=12V

CF_DRV

1.3

DRV Output High Clamp Level

VCC=24V

DRV_H

DRV pin Rising Time

DRV pin load=1nF

TR_DRV

DRV pin Falling Time

DRV pin load=1nF

TF_DRV

COMP clamp voltage

VCOMP

3.8

Feedback (FB)

Reference Voltage

VFB

0.291

0.3

0.309

Tolerance of Reference Voltage

-3.0

3.0

PWM Dimming (DIM)

DIM Voltage threshold

Enable

VDIM_H

2.5

Disable

VDIM_L

Resistance from DIM pin to GND

R_DIM

150



PWM dimming Frequency

200

30K

Dimming Duty-Cycle

100

Shutdown Recover Delay Time

(TDOWN)

TRSD

Current Sensing (CS)

Current Sense Input Threshold

Voltage

VCS

0.4

0.45

0.5

LEB time

T_LEB

275

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