- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377970 > ML4825 (Fairchild Semiconductor Corporation) High Frequency PWM Controller(高頻PWM控制器) PDF資料下載
參數(shù)資料
| 型號： | ML4825 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Frequency PWM Controller(高頻PWM控制器) |
| 中文描述： | 高頻PWM控制器（高頻脈寬調(diào)制控制器） |
| 文件頁數(shù)： | 1/9頁 |
| 文件大小： | 108K |
| 代理商： | ML4825 |
May 1997
ML4825
High Frequency Power Supply Controller
GENERAL DESCRIPTION
The ML4825 High Frequency PWM Controller is an IC
controller optimized for use in Switch Mode Power
Supply designs running at frequencies to 1MHz.
Propagation delays are minimal through the comparators
and logic for reliable high frequency operation while slew
rate and bandwidth are maximized on the error amplifier.
This controller is designed to work in either voltage or
current mode and provides for input voltage feed forward.
A 1V threshold current limit comparator provides cycle-
by-cycle current limit while exceeding a 1.4V threshold
initiates a soft-start cycle. The soft start pin doubles as a
maximum duty cycle clamp. An under-voltage lockout
circuit with 800mV of hysteresis assures low startup
current and drives the outputs low.
This controller is similar in architecture and performance
to the UC1825 controller, however the ML4825 includes
many features not found on the 1825. These features are
set in
Italics
.
BLOCK DIAGRAM
(Pin configuration shown for 16-pin version)
+
–
R
T
OUT A
E/A OUT
I
LIM
/SD
INV
SS
1.4V
1V
9
μ
A
V+
1V
R
POWER V
C
POWER GND
P
4V
R
TF.F.
OSC
S
UNDER
VOLTAGE
LOCKOUT
INTERNAL
BIAS
Q
ENABLE
V
REF
V
REF
GEN
9V
Q
Q
C
Q
S
RAMP
C
T
CLOCK OUT
PWR V
C
OUT B
PWR GND
V
CC
SIGNAL GND
NI
5
6
7
4
13
11
14
10
15
12
3
2
1
9
8
+
–
+
–
–
+
–
+
–
+
+
–
1.5V V
REF
16
COMP
ERROR
AMP
1.25V
FEATURES
I
Practical operation at switching frequencies to 1.0MHz
I
High current (2A peak) dual totem pole outputs
I
Wide bandwidth error amplifier
I
Fully latched logic with double pulse suppression
I
Pulse-by-pulse current limiting
I
Soft start and maximum duty cycle control
I
Under voltage lockout with hysteresis
I
Precision trimmed 5.1V bandgap reference
I
Pin compatible improved replacement for UC1825
I
Fast shut down path from current limit to outputs
I
Outputs preset to known condition after under voltage
lockout
I
Soft start latch ensures full soft start cycle
I
Outputs pull low for undervotage lockout
REV. 1.0 10/12/2000
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4828 | BiCMOS Phase Modulation/Soft Switching Controller(BiCMOS 相調(diào)制器/全橋軟開關(guān)控制器) |
| ML4830 | Electronic Ballast Controller(電子整流器控制器) |
| ML4831 | Electronic Ballast Controller(電子整流器控制器) |
| ML4832 | Electronic Dimming Ballast Controller(電子調(diào)光整流器控制器) |
| ML4833 | Electronic Dimming Ballast Controller(電子調(diào)光整流器控制器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4825 WAF UP | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4825CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Frequency Power Supply Controller |
| ML4825CP UP WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4825CQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4825CQ UP WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。