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參數(shù)資料
| 型號： | MIC3839 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Flexible Push-Pull PWM Controller |
| 中文描述： | 靈活的推挽式PWM控制器 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 341K |
| 代理商： | MIC3839 |
August 2003
5
MIC3838/3839
MIC3838/3839
Micrel
Parameter
Condition
Min
Typ
Max
Units
Undervoltage Lockout Section
Start Threshold
MIC3838,
Note 11
11.5
12.5
13.5
V
MIC3839
4.1
4.3
4.5
V
Minimum Operating Voltage
MIC3838
7.6
8.3
9
V
After Start
MIC3839
3.9
4.1
4.3
V
Hysteresis
MIC3838
3.5
4.2
5.1
V
MIC3839
0.1
0.2
0.3
V
Soft Start Section
COMP Rise Time
FB = 1.8V, Rise from 0.5V to 3V
2.5
20
ms
Overall Section
Startup Current
V
DD
< Start Threshold (MIC3839)
FB = 0V, Ramp = I
LIM
= 0V,
Notes 11, 12
I
DD
= 10mA,
Note 13
130
260
μ
A
Operating Supply Current
1.5
2
mA
V
DD
Zener Shunt Voltage
13
14
15
V
Note 1.
Note 2.
Note 3.
Note 4.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Maximum operating voltage is equal to the V
(zener) shunt voltage. When operating at or near the shunt voltage, care must be taken to limit
the V
DD
pin current less than the 20mA V
DD
maximum current rating.
Specification for packaged product only.
Measured at RC.
COMP pin is internally clamped to 3.65V(typ.). COMP pin source current is measured at V
COMP
= 3.0V to avoid interferring with clamp.
Minimum source current is higher as V
COMP
approaches V
CLAMP
.
V
CS
Note 5.
Note 6.
Note 7.
Note 8.
Gain is defined by A =
V
COMP
, 0
≤
V
CS
≤
0.4V.
Note 9.
Note 10.
The internal current sink on the Ramp and I
pin are designed to discharge an external filter capacitor. It is not intended to be a DC sink
path. Internal discharge FET should be able to discharge the Volt-Sec clamp and feed-forward circuits in the figure below within 50ns.
Note 11.
For MIC3838, set V
DD
above the start threshold before setting at 10V.
Note 12.
Does not include current in the external oscillator network.
Note 13.
Start threshold and Zener Shunt threshold track one another.
Parameter measured at trip point of latch with FB at 0V
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| MIC3839YMM TR | 功能描述:DC/DC 開關(guān)控制器 Push-Pull DC/DC Controller (Lead Free) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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