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參數(shù)資料
| 型號(hào)： | ML4810 |
| 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(yè)數(shù)： | 1/11頁(yè) |
| 文件大小： | 196K |
| 代理商： | ML4810 |
BLOCK DIAGRAM
(Pin numbers shown are for ML4811)
May 1997
ML4810, ML4811
High Frequency Power Supply Controller
FEATURES
I
Integrating Soft Start Reset
I
High current (2A peak) dual totem pole outputs
I
Practical operation to 1MHz (f
OSC
)
I
5.1V
±
2% trimmed bandgap reference
I
Under voltage lockout with 7V hysteresis
I
Soft Start Reset Delay (ML4811)
I
Oscillator synchronization function (ML4811)
I
Soft Start latch ensures full soft start cycle
I
Outputs pull low for undervoltage lockout
I
Accurately controlled oscillator ramp discharge current
I
All timing currents “slaved” to R
T
for precise control
GENERAL DESCRIPTION
The ML4810 and ML4811 High Frequency PWM
Controllers are optimized for use in Switch Mode Power
Supply designs running at frequencies to 1MHz. The
ML4810/11 contain a unique overload protection circuit
which helps to limit stress on the output devices and
reliably performs a soft-start reset. These controllers are
designed to work in either voltage or current mode and
provide for input voltage feed forward.
A 1.1V threshold current limit comparator provides a
cycle-by-cycle current limit. An integrating circuit
“counts” the number of times the 1.1V limit was reached.
A soft-start cycle is initiated if the cycle-by-cycle current
limit is repeatedly activated. A reset delay function is
provided on the ML4811.
These controllers are similar to the UC1825 controller,
however these controllers include many features not
found on the 1825. These features are set in Italics.
+
–
R
T
OUT A
E/A OUT
I
LIM
/SD
RC (RESET)
RESET DELAY
INV
SOFT START
1.5V
CLOCK
1.1V
1.1V
5.1V
2.45V
1.1V
I(1)
3
×
I(1)
V+
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
PWR V
C
OUT B
POWER GND
V
CC
GND
NI
6
7
SYNC
10
O.V.P./SHUTDOWN
11
8
3
2
1
12
9
R
Q
S
+
–
+
–
+
–
–
+
4
20
–
+
–
+
–
+
2.2V
1.5V V
REF
COMP
ERROR
AMP
1.25V
I(1)
V+
–
+
–
+
I(1) =
3V
16 x R
T
5
16
14
17
13
18
15
19
REV. 1.0 10/10/2000
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4811 | High Frequency PWM Controller(高頻PWM控制器) |
| ML4812IQ | Power Factor Controller |
| ML4812 | Power Factor Controller |
| ML4812CP | Power Factor Controller |
| ML4812CQ | Power Factor Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4810CP | 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:High Frequency Power Supply Controller |
| ML4810CS | 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:High Frequency Power Supply Controller |
| ML4811CP | 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:High Frequency Power Supply Controller |
| ML4811CS | 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:High Frequency Power Supply Controller |
| ML4812 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:功率因數(shù)控制器 |
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