LD7531 datasheet(5/18 Pages) LEADTREND

Part #	LD7531

Description	Green-Mode PWM Controller with Frequency Trembling and Integrated Protections

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Manufacturer	LEADTREND [Leadtrend Technology]

Direct Link	https://www.leadtrend.com.tw/

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LD7531

5

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD7531-DS-00 June 2008

Electrical Characteristics

(TA = +25

oC unless otherwise stated, VCC=15.0V)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage (Vcc Pin)

Startup Current

12

20

μA

VCOMP=0V

2.8

3.5

mA

VCOMP=3V

3.0

mA

Protection tripped (OLP)

0.45

mA

Operating Current

(with 1nF load on OUT pin)

Protection tripped (OVP)

0.5

mA

UVLO (off)

9.0

10.0

11.0

V

UVLO (on)

15.0

16.0

17.0

V

OVP Level

26.8

28.0

29.2

V

Voltage Feedback (Comp Pin)

Short Circuit Current

VCOMP=0V

1.3

2.2

mA

Open Loop Voltage

COMP pin open

5.9

V

Green Mode Threshold VCOMP

2.35

V

Current Sensing (CS Pin)

Maximum Input Voltage, Vcs(off)

0.80

0.85

0.90

V

Leading Edge Blanking Time

190

nS

Input impedance

1

M

Ω

Delay to Output

100

nS

Oscillator for Switching Frequency

Frequency

RT=100K

Ω

60

65

70

KHz

Green Mode Frequency

Fs=65kHz

21

KHz

Trembling Frequency

± 4.0

KHz

Temp. Stability

(-40

°C ~105°C)

5

%

Voltage Stability

(VCC=11V-25V)

1

%

Gate Drive Output (OUT Pin)

Output Low Level

VCC=15V, Io=20mA

1

V

Output High Level

VCC=15V, Io=20mA

8

V

Rising Time

Load Capacitance=1000pF

170

350

nS

Falling Time

Load Capacitance=1000pF

50

100

nS

OLP (Over Load Protection)

OLP Trip Level

Vcomp (OLP)

5.0

V

OLP Delay Time

Fs=65kHz

50

mS

* RT value is in proportion to OLP delay time.

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