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参数资料
| 型号： | LX1681CDM |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, SOIC-8 |
| 文件页数： | 2/9页 |
| 文件大小： | 145K |
| 代理商： | LX1681CDM |
V O L T AGE -M ODE PWM C ONTROLLERS
LX1681/1682
PRODUCT DA T ABOOK 1996/1997
Copyright 1999
Rev. 1.0 5/99
2
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
JA
165°C/W
Junction Temperature Calculation: T
J = TA + (PD x θJA).
The
θ
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
V
FB
V
OUT = VFB , TA = 25°C
V
OUT = VFB , 0°C ≤ TA ≤ 70°C
Oscillator
Frequency
F
OSC
Ramp Amplitude
V
RAMP
Current Set
I
SET
V
CS = VCC - 0.4V
V
TRIP
Reference to V
CC
Current Sense Delayed
T
CSD
Error Amplifier
Input Resistance
R
IN
V
OUT = VFB
Output Drivers
Drive Rise Time, Fall Time
T
RF
C
L = 3000pF
Drive High
V
DH
I
SOURCE = 20mA, VC1 = 12V
Drive Low
V
DL
I
SINK = 20mA, VC1 = 12V
UVLO and Soft-Start (SS)
V
CC5 Start-Up Threshold
V
ST
V
C1 > 4.0V
Hysteresis
SS Resistor
R
SS
SS Output Enable
V
EN
Hiccup Duty Cycle
DC
HIC
C
SS = 0.1F, FREQ = 100Hz
Supply Current
V
CC12 Dynamic Supply Current
I
CD
Out Freq = 200kHz, C
L = 3000pF, Synch., VSS > 0.3V
Static Supply Current
12V
I
VC1
V
SS < 0.3V
5V
I
VCC
V
SS < 0.3V
Units
1.237
1.25
1.262
V
1.231
1.269
V
LX1681/1682
Min.
Typ.
Max.
170
190
230
kHz
1.25
V
PP
20
k
40
45
A
-460
-400
-340
mV
1.1
sec
50
ns
10
11
V
0.1
0.2
V
4.0
4.25
4.5
V
0.10
V
20
k
0.25
0.3
0.35
V
10
%
24
28
mA
57
mA
10
12
mA
Current Sense
DM PACKAGE
(Top View)
V
CC
CS
V
C1
TDRV
V
FB
SS
N.C. / GND*
GND / BDRV*
1
8
27
36
45
* Pin 3 = N.C. for LX1681, GND for LX1682
Pin 4 = GND for LX1681, BDRV for LX1682
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