LD5850GS datasheet(5/11 Pages) LEADTREND

5 / 11 page

LD5850

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD5850-DS-00

November 2012

Electrical Characteristics

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

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNITS

Input Power (VCC)

Turn On Level

UVLO(on)

8.7

Turn Off Level

UVLO(off)

Shutdown Current

DIM=Low, over 200ms

A

Standby Current

DIM=Low

Operating Current

DIM=High,

Switching at no load

Boost Converter

Switching frequency

162

180

198

KHz

Boost Maximum duty cycle

Switching frequency=180KHz

DRV gate drive

Source current, VIN=12V

1.2

Sink current, VIN=12V

1.3

Output High Clamp Level

VCC=24V

DRV pin Rising Time

DRV pin load=1nF

DRV pin Falling Time

DRV pin load=1nF

COMP clamp voltage

3.6

3.8

4.0

Feedback (FB)

Reference Voltage

0.3

Tolerance of Reference Voltage

-3

PWM Dimming (DIM)

DIM Voltage threshold

Enable

Disable

0.8

Resistance from DIM pin to GND

600



PWM dimming frequency

0.1

KHz

Dimming Duty-Cycle

100

Shutdown Recover Delay Time

(TDOWN)

(Note 1)

200

Current Sensing (CS)

Current Sense Input Threshold

Voltage

0.45

0.5

0.55

LEB time

275

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