LX1684 Ver la hoja de datos (PDF) - Microsemi Corporation

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componentes Descripción

Fabricante

LX1684

Voltage-Mode PWM Controller

Microsemi Corporation 

LX1684

TM

®

Voltage-Mode PWM Controller

PRODUCTION DATA SHEET

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 70°C except where

otherwise noted. Test conditions: VCC=5V, VC1=16V

Parameter

` REFERENCE

Reference Voltage

` OSCILLATOR

Frequency

Ramp Amplitude

` ERROR AMPLIFIER

Input Resistance

` CURRENT SENSE

Current Set

VTRIP

Current Sense Delayed

` OUTPUT DRIVERS

Drive Rise Time, Fall Time

Drive High

Drive Low

` UVLO AND SOFT-START (SS)

Symbol

Test Conditions

VFB VOUT =VFB, TA=25°C

VOUT =VFB, 0°C < TA < 70°C

FOSC

VRAMP

RIN

VOUT = VFB

ISET VCS = VCC –0.4V

TCSD

TRF CL = 3000pF

VDH ISOURCE = 20mA, VC1=16V

VDL ISINK = 20mA, VC1 =16V

LX1684

Units

Min Typ Max

1.237 1.25 1.262 V

1.231

1.269 V

135 175 200 kHz

1.25

VPP

20

kΩ

40

45

µA

300 380 420 mV

1.0

µsec

50

nS

13

14

V

0.1 0.2

V

VCC5 Start-Up Threshold

Hysteresis

SS Resistor

SS Output Enable

Hiccup Duty Cycle

` SUPPLY CURRENT

VC1 Dynamic Supply Current

Static Supply Current VC1

5V

VST VC1 > 4.0V

RSS

VEN

DCHIC

CSS = 0.1µF, FREQ =100Hz

4.0 4.25 4.5

V

0.10

V

22

kΩ

0.25 0.3 0.35 V

12

14

%

ICD

Out Freq = 175kHz, CL=3000pF, Synch., VSS

> 0.3V

IVC1 VSS < 0.3V ; outputs low (disable), VC1 = 16V

IVCC VSS > 0.3V ; outputs low (disable)

30

40 mA

7

9

mA

9

12 mA

Copyright © 2000

Rev. 1.0c, 2005-03-08

Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 3

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