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參數(shù)資料
| 型號(hào)： | TK732XX |
| 廠商： | TOKO Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無電容，NMOS管，150mA的低壓差穩(wěn)壓器的反向電流保護(hù) |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 117K |
| 代理商： | TK732XX |
Page 12
January 1999 TOKO, Inc.
TK732xx
PULSE CURRENT LIMIT MODE
The equation for the pulse output current limit is as follows:
I
SET
(mA) = 90 (mV) / R
IPK
(
)
During the initial turn-on, charge (surge) current flows to
the output capacitor. This IC has a possibility for the
current limit to operate and to turn off the output by the
charge current of the output capacitor. Therefore, the
relationship between C
L
and C
P
is set as shown in the
graph below:
CP
CN
VIN
COLLECTOR
BASE
EMITTER
RP
330 k
VOUT
VCONT
CL
RIPK
CIN
GND
TEXTERNAL
TK732xx
APPLICATION INFORMATION (CONT.)
C
CP (μF)
100
1000
10
10
0.1
0.01
STABLE REGION
1
1
VOUT
IOUT
CONTINUOUS CURRENT LIMIT MODE
In the continuous current limit mode, the C
pin (pin 3)
is directly connected to ground. The output current limit is
set by R
IPK
according to the following equation:
I
SET
(mA) = 100 (mV) / R
IPK
(
)
If the continuous current limit mode is also used for output
short circuit protection, the I
SET
value is set 50% to 100%
more than the maximum operating current. The current
transistor is selected from the I
SET
value. The output
voltage drops when the output current exceeds the I
SET
value. However, the output voltage returns to normal once
the output current decreases below the I
SET
value.
CN
VIN
COLLECTOR
BASE
EMITTER
VOUT
VCONT
CL
CIN
CONT
RIPK
GND
TEXTERNAL
TK732xx
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