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參數(shù)資料
| 型號： | ML4823 |
| 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： | 121K |
| 代理商： | ML4823 |
May 1997
ML4823
High Frequency Power Supply Controller
FEATURES
I
Practical operation at switching frequencies to 1.0MHz
I
High current (2A peak) totem pole output
I
Wide bandwidth error amplifier
I
Fully latched logic with double pulse suppression
I
Pulse-by-pulse current limiting
I
Soft start and max. duty cycle control
I
Under voltage lockout with hysteresis
I
5.1V trimmed bandgap reference
I
Low start-up current (1.1mA)
I
Pin compatible improved replacement for UC3823
I
Fast shut down path from current limit to output
I
Soft start latch ensures full soft start cycle
I
Outputs pull low for undervoltage lockout
GENERAL DESCRIPTION
The ML4823 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 for single-ended applications
using voltage or current mode and provides for input
voltage feed forward.
A 1V threshold current limit comparator provides cycle-
by-cycle current limit and exceeding a 1.4V threshold
initiates a soft-start cycle. The soft start pin doubles as a
maximum duty cycle clamp. All logic is fully latched to
provide jitter-free operation and prevent multiple pulsing.
An under-voltage lockout circuit with 800mV of hysteresis
assures low startup current and drives the outputs low
during fault conditions.
This controller is an improved second source for the
UC3823 controller; however, the ML4823 includes
features not found on the 3823. These features are set in
italics.
BLOCK DIAGRAM
(Pin Configuration Shown for 16-Pin Version)
5
6
OSC
R
T
C
T
4
7
3
RAMP
E/A OUT
COMP
–
+
+
1.25V
S
R
Q
13
14
12
ERROR
AMP
–
+
2
1
NI
INV
POWER V
C
OUTPUT
POWER GND
CLOCK OUT
8
SOFT START
V+
+
–
1V
11
9
I
LIM
REF
I
LIM
/S.D.
+
–
1.4V
–
+
S
R
Q
4V
5.1V
+
–
16
5.1V V
REF
+
–
ENABLE
V
REF
V
REF
GEN
15
V
CC
UNDER
VOLTAGE
LOCKOUT
9V
10
SIGNAL GND
INTERNAL
BIAS
REV. 1.0 10/12/2000
相關PDF資料 |
PDF描述 |
|---|---|
| ML4823IQ | High Frequency Power Supply Controller |
| ML4823CP | High Frequency Power Supply Controller |
| ML4823CQ | High Frequency Power Supply Controller |
| ML4823CS | High Frequency Power Supply Controller |
| ML4823IS | High Frequency Power Supply Controller |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ML4823CP | 功能描述:電流型 PWM 控制器 Pwr Spply Controller High Frequency RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ML4823CP_Q | 功能描述:模數(shù)轉換器 - ADC Pwr Spply Controller High Frequency RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ML4823CQ | 功能描述:電流型 PWM 控制器 Pwr Spply Controller High Frequency RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ML4823CQX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4823CS | 功能描述:電流型 PWM 控制器 1MHZ SMPS Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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