LX1681CDM データシートの表示（PDF） - Microsemi Corporation
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LX1681CDM Datasheet PDF : 9 Pages
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PRODUCT DATABOOK 1996/1997
LX1681/1682
VOLTAGE-MODE PWM CONTROLLERS
PRODUCTION DATA SHEET
A B S O L U T E M A X I M U M R AT I N G S (Note 1)
Supply Voltage (VC1) ............................................................................................ 18V
Supply Voltage (V ) .............................................................................................. 7V
CC
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.
PACKAGE PIN OUTS
VFB
SS
N.C. / GND*
GND / BDRV*
1
8
VCC
2
7
CS
3
6
VC1
4
5
TDRV
DM PACKAGE
(Top View)
* Pin 3 = N.C. for LX1681, GND for LX1682
Pin 4 = GND for LX1681, BDRV for LX1682
THERMAL DATA
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
165°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, 4.75V < VCC < 5.25V and 10.8V < VC1 < 13.2V, 0°C ≤ TA ≤ 70°C. Test conditions: VCC = 5V, VC1 = 12V, T = 25°C.)
Parameter
Symbol
Test Conditions
LX1681/1682
Min. Typ. Max.
Reference
Reference Voltage
Oscillator
VFB
VOUT = VFB , TA = 25°C
VOUT = VFB , 0°C ≤ TA ≤ 70°C
1.237 1.25 1.262
1.231
1.269
Frequency
Ramp Amplitude
Error Amplifier
FOSC
VRAMP
170 190 230
1.25
Input Resistance
RIN
VOUT = VFB
20
Current Sense
Current Set
VTRIP
Current Sense Delayed
Output Drivers
ISET
VCS = VCC - 0.4V
Reference to VCC
TCSD
40
45
-460 -400 -340
1.1
Drive Rise Time, Fall Time
Drive High
Drive Low
UVLO and Soft-Start (SS)
TRF CL = 3000pF
VDH ISOURCE = 20mA, VC1 = 12V
VDL ISINK = 20mA, VC1 = 12V
50
10
11
0.1 0.2
VCC5 Start-Up Threshold
Hysteresis
VST VC1 > 4.0V
4.0 4.25 4.5
0.10
SS Resistor
SS Output Enable
Hiccup Duty Cycle
Supply Current
RSS
VEN
DCHIC
CSS = 0.1µF, FREQ = 100Hz
20
0.25 0.3 0.35
10
VCC12 Dynamic Supply Current
Static Supply Current
12V
5V
ICD Out Freq = 200kHz, CL = 3000pF, Synch., VSS > 0.3V
IVC1 VSS < 0.3V
IVCC VSS < 0.3V
24
28
5
7
10
12
Units
V
V
kHz
V
PP
kΩ
µA
mV
µsec
ns
V
V
V
V
kΩ
V
%
mA
mA
mA
2
Copyright © 1999
Rev. 1.0 5/99
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