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参数资料
| 型号： | L4990D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SO-16 |
| 文件页数： | 1/24页 |
| 文件大小： | 322K |
| 代理商： | L4990D |
L4990
L4990A
PRIMARY CONTROLLER
CURRENT-MODE CONTROL PWM
SWITCHING FREQUENCY UP TO 1MHz
LOW START-UP CURRENT < 0.45mA
HIGH-CURRENT OUTPUT DRIVE SUITABLE
FOR POWER MOSFET (1A)
FULLY LATCHED PWM LOGIC WITH DOU-
BLE PULSE SUPPRESSION
PROGRAMMABLE DUTY CYCLE
100% AND 50% MAXIMUM DUTY CYCLE
LIMIT
PROGRAMMABLE SOFT START
PRIMARY OVERCURRENT FAULT DETEC-
TION WITH RE-START DELAY
PWM UVLO WITH HYSTERESIS
IN/OUT SYNCHRONIZATION
DISABLE LATCHED
INTERNAL 100ns LEADING EDGE BLANK-
ING OF CURRENT SENSE
PACKAGE: DIP16 AND SO16W
DESCRIPTION
This primary controller I.C., developed in BCD60II
technology, has been designed to implement off
line or DC-DC power supply applications using a
fixed frequency current mode control.
Based on a standard current mode PWM control-
ler this device includes some features as pro-
grammable soft start, IN/OUT synchronization,
disable (to be used for over voltage protection
and for power management), precise maximum
Duty Cycle Control, 100ns (typ) leading edge
blanking on current sense, pulse by pulse current
limit and overcurrent protection with soft start in-
tervention.
July 1999
+
-
+
-
TIMING
2
3
+
-
14
T
Vref
CLK
2.5V
+
-
1.2V
13
BLANKING
PWM
FAULT
SOFT-START
R
SQ
25V
16V/10V
VREF OK
DIS
+
-
E/A
1V
R
2R
DIS
2.5V
7
6
5
11
10
9
4
8
15
1
13V
PWM UVLO
12
SGND
COMP
SS
ISEN
DIS
DC
RCT
SYNC
DC-LIM
VCC
VREF
D98IN1002
VFB
PGND
OUT
VC
OVER CURRENT
BLOCK DIAGRAM
ORDERING NUMBERS: L4990/L4990A(DIP16)
L4990D/L4990AD (SO16W)
MULTIPOWER BCD TECHNOLOGY
DIP16
SO16W
1/24
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相关代理商/技术参数 |
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|---|---|
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| L4993D | 功能描述:低压差稳压器 - LDO Low drop voltage regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| L4993DTR | 功能描述:低压差稳压器 - LDO Low drop voltage regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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