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参数资料
| 型号： | LX1570IDMT |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, PDSO8 |
| 封装： | PLASTIC, SOIC-8 |
| 文件页数： | 7/12页 |
| 文件大小： | 257K |
| 代理商： | LX1570IDMT |
PHASE MODULATED AC SYNCHRONOUS SECONDARY-SIDE CONTROLLER
LX1570/1571
PRODUCT DA T ABOOK 1996/1997
Copyright 1997
Rev. 0.9.3
1/97
4
P RELIMINAR Y D AT A S HEET
S.S.
1
V
FB
2
COMP
3
C.S.
4
GND
5
OUT
6
DRV
V
CC
7
C
T
8
This pin acts as the soft-start pin. A capacitor connected from this pin to GND allows slow ramp up of the NI input
resulting in output soft start during start up. This pin is clamped to the internal voltage reference during the normal
operation and sets the reference for the feedback regulator.
This pin is the inverting input of the Error Amplifier. It is normally connected to the switching power supply output
through a resistor divider to program the power supply voltage. This pin instead of the NI pin is internally trimed to
1% tolerance to include the offset voltage error of the error amp.
This pin is the Error Amplifier output and is made available for loop compensation. Typically a series R&C network
is connected from this pin to GND.
A voltage proportional to the inductor current is sensed by an external sense resistor (1570) or current transformer (1571)
in series with the return line and is connected to this pin. The output drive is terminated and latched off when this voltage
amplified by the internal gain (see option table) exceeds the voltage set by the E.A output voltage. The maximum
allowable voltage at this pin during normal operation is -0.8V typ for LX1570 and 6V typ for LX1571.
This pin is combined control circuitry and power GND. All other pins must be positive with respect to this pin, except
for C.S pin.
This pin drives a gate drive transformer which drives the power mosfet. A Schottky diode such as 1N5817 must be
connected from this pin to GND in order to prevent the substrate diode conduction.
This pin is the positive supply voltage for the control IC. A high frequency capacitor must be closely placed and
connected from this pin to GND to provide the turn-on and turn-off peak currents required for fast switching of the power
Mosfet.
The free running oscillator frequency is programmed by connecting a capacitor from this pin to GND.
Pin
#
Description
FUNCTIONAL PIN DESCRIPTION
Rise / Fall Time
t
R / tF
C
L = 1000pF
Output HI
V
DH
I
SOURCE = 200mA, VCS = 0V, VFB = 2.3V
Output LO
V
DL
I
SINK = 200mA, VCS = 1.2V, VFB = 2.3V
Output Pull Down
V
DPD
V
CC = 0V, IPULL UP = 2mA
ELECTRICAL CHARACTERISTICS
(Con't.)
Parameter
Symbol
Test Conditions
Units
LX1570/1571
Min.
Typ.
Max.
1.7
2.0
2.4
V
52
54
56
%
E.A. Output to PWM Drive Offset
V
OFS
Fixed Duty Cycle
D
UVLO Section
15
16
17
V
910
11
V
5.5
6
6.5
V
Start-Up Threshold
V
ST
Turn Off Threshold
V
OFF
Hysterises
V
H
Supply Current Section
Dynamic Operating Current
I
Qd
Out Freq = 100kHz, C
L = 0
Start-Up Current
I
ST
18
30
mA
150
250
A
50
ns
13.5
V
0.8
V
1V
PWM Section
Output Drive Section
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| LX1570MY | 功能描述:IC REG CTRLR ISO PWM CM 8-DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LX1571 | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:PHASE MODULATED AC SYNCHRONOUS SECONDARY-SIDE CONTROLLER |
| LX1571CDM | 功能描述:IC REG CTRLR ISO PWM CM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LX1571CM | 功能描述:IC REG CTRLR ISO PWM CM 8-DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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