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參數(shù)資料
| 型號(hào)： | AAT1109-S-T |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | ONE-CHANNEL STEP-UP PWM CONTROLLER |
| 中文描述： | 單通道升壓的PWM控制器 |
| 文件頁(yè)數(shù)： | 5/18頁(yè) |
| 文件大?。?/td> | 601K |
| 代理商： | AAT1109-S-T |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)當(dāng)前第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)
Advanced Analog Technology, Inc.
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Advanced Analog Technology, Inc
.
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Page 5 of 18 V 1.0
AAT1109
HOW TO SET THE TIME CONSTANT FOR SOFT-START AND SHORT
CIRCUIT PROTECTION
1. Soft-Start
AAT1109 operates in soft-start mode. The PWM comparator monitors the voltage at soft-start setting
and SCP pin, which varies proportionally to each other. This proportion relation controls the ON duty
of the OUT pin and activates the soft-start operation. In the Soft-start mode, the voltage at SCP pin
(
SCP
V
) is input to the PWM comparator, so that the ON duty of the OUT pin is determined by the
When the soft-started mode is completed, its setting voltage remains high and the circuit enters the
output short circuit protection wait state while
SCP
V
Soft-Start Time
(
)
(
)
F
C
84
0
t
SCP
s
μ
×
.
~
sec
2. Short Circuit Protection
In response to a sudden drop of the switching regulator output, the device locks the error amplifier, OE
pin, at
+
OS
V
, and starts feeding currents into the capacitor at SCP pin to achieve in a voltage value of
approximately 0.84V at this pin. This chain reaction protects the circuit by keeping the SCP pin and
output pin low. Users could reverse this process by restarting the device.
Short Circuit Detection Time
(
)
(
)
F
C
84
0
t
SCP
SCP
μ
×
.
~
sec
SCP
V
.
remains low.
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| AAT1109-T2 | 制造商:AAT 制造商全稱:AAT 功能描述:ONE-CHANNEL STEP-UP PWM CONTROLLER |
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