LX1682CDM datasheet(2/9 Pages) MICROSEMI

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V O L T AGE -M ODE PWM C ONTROLLERS

LX1681/1682

PRODUCT DA T ABOOK 1996/1997

Rev. 1.0 5/99

P RODUCTION D AT A S HEET

Supply Voltage (V

C1) ............................................................................................ 18V

Supply Voltage (V

CC) .............................................................................................. 7V

Output Drive Peak Current Source (500ns) ....................................................... 1.0A

Output Drive Peak Current Sink (500ns) ........................................................... 1.0A

Input Voltage (SS/ENABLE Pin) ............................................................. -0.3V to 6V

Operating Junction Temperature .................................................................... 150°C

Storage Temperature Range ........................................................... -65°C to +150°C

Lead Temperature (Soldering, 10 Seconds) .................................................... 300°C

Note 1. Exceeding these ratings could cause damage to the device. All voltages are with

respect to Ground. Currents are positive into, negative out of the specified

terminal.

DM PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθθθθ

165°C/W

Junction Temperature Calculation: T

J = TA + (PD x θJA).

The

JA numbers are guidelines for the thermal performance of the device/pc-board

system. All of the above assume no ambient airflow.

THERMAL DATA

ABSOLUTE MAXIMUM RATINGS

(Note 1)

PACKAGE PIN OUTS

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, 4.75V < V

CC < 5.25V and 10.8V < VC1 < 13.2V, 0°C ≤ TA ≤ 70°C.

Test conditions: V

CC = 5V, VC1 = 12V, T = 25°C.)

Reference

Parameter

Symbol

Test Conditions

Reference Voltage

OUT = VFB , TA = 25°C

OUT = VFB , 0°C ≤ TA ≤ 70°C

Oscillator

Frequency

OSC

Ramp Amplitude

RAMP

Current Set

SET

CS = VCC - 0.4V

TRIP

Reference to V

Current Sense Delayed

CSD

Error Amplifier

Input Resistance

OUT = VFB

Output Drivers

Drive Rise Time, Fall Time

L = 3000pF

Drive High

SOURCE = 20mA, VC1 = 12V

Drive Low

SINK = 20mA, VC1 = 12V

UVLO and Soft-Start (SS)

CC5 Start-Up Threshold

C1 > 4.0V

Hysteresis

SS Resistor

SS Output Enable

Hiccup Duty Cycle

HIC

SS = 0.1µF, FREQ = 100Hz

Supply Current

CC12 Dynamic Supply Current

Out Freq = 200kHz, C

L = 3000pF, Synch., VSS > 0.3V

Static Supply Current

12V

VC1

SS < 0.3V

VCC

SS < 0.3V

Units

1.237

1.25

1.262

1.231

1.269

LX1681/1682

Min.

Typ.

Max.

170

190

230

kHz

1.25

Ω

µA

-460

-400

-340

1.1

µsec

0.1

0.2

4.0

4.25

4.5

0.10

Ω

0.25

0.3

0.35

Current Sense

DM PACKAGE

(Top View)

TDRV

N.C. / GND*

GND / BDRV*

* Pin 3 = N.C. for LX1681, GND for LX1682

Pin 4 = GND for LX1681, BDRV for LX1682

LX1682CDM Datasheet(PDF) 2 Page - Microsemi Corporation

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