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參數資料
| 型號： | L4990 |
| 廠商： | 意法半導體 |
| 英文描述： | PRIMARY CONTROLLER |
| 中文描述： | 主控制器 |
| 文件頁數： | 1/24頁 |
| 文件大?。?/td> | 322K |
| 代理商： | L4990 |
L4990
L4990A
PRIMARY CONTROLLER
CURRENT-MODE CONTROL PWM
SWITCHING FREQUENCY UP TO 1MHz
LOW START-UPCURRENT < 0.45mA
HIGH-CURRENT OUTPUT DRIVE SUITABLE
FOR POWER MOSFET(1A)
FULLY LATCHED PWM LOGIC WITH DOU-
BLE PULSESUPPRESSION
PROGRAMMABLE DUTY CYCLE
100% AND 50% MAXIMUM DUTY CYCLE
LIMIT
PROGRAMMABLE SOFTSTART
PRIMARY OVERCURRENT FAULT DETEC-
TION WITH RE-START DELAY
PWMUVLO WITH HYSTERESIS
IN/OUTSYNCHRONIZATION
DISABLELATCHED
INTERNAL 100ns LEADING EDGE BLANK-
ING OF CURRENT SENSE
PACKAGE:DIP16 AND SO16W
DESCRIPTION
This primary controller I.C., developedin BCD60II
technology, has been designed to implement off
line or DC-DC power supply applications using a
fixed frequencycurrent 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
DIS
2.5V
+
-
1.2V
13
BLANKING
PWM
FAULT
SOFT-START
R
S
Q
25V
16V/10V
VREF OK
+
-
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
V
CC
VREF
D98IN1002
VFB
PGND
OUT
V
C
OVER CURRENT
BLOCK DIAGRAM
ORDERING NUMBERS:
L4990/L4990A(DIP16)
L4990D/L4990AD (SO16W)
MULTIPOWER BCD TECHNOLOGY
DIP16
SO16W
1/24
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| L4990D | PRIMARY CONTROLLER |
| L4992 | TRIPLE OUTPUT POWER SUPPLY CONTROLLER |
| L5170 | CAP CER 47000PF 50V X7R 0805 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| L4990A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PRIMARY CONTROLLER |
| L4990AD | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PRIMARY CONTROLLER |
| L4990D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PRIMARY CONTROLLER |
| L4991 | 功能描述:TEST COIL FOR REED SWITCH, 1PC RoHS:是 類別:開關 >> 配件 系列:- 標準包裝:100 系列:- 其它名稱:886.0007886.0007-ND |
| L4992 | 制造商:STMicroelectronics 功能描述: 制造商:STMicroelectronics 功能描述:VOLT SUPERVISOR CNTRLR 5.1V/3.3V 32TQFP - Trays |
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