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參數(shù)資料
| 型號： | Si9177BM-TI |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | 200-mA PSM Step Down Converter with Bypass Capability |
| 中文描述： | 200毫安掩模降壓轉(zhuǎn)換器與繞道能力 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 104K |
| 代理商： | SI9177BM-TI |
Si9177
Vishay Siliconix
New Product
www.vishay.com
6
Document Number: 70312
S-03663—Rev. B, 07-Apr-03
DETAIL OPERATIONAL DESCRIPTION (CONT’D)
An external Schottky diode is required for PSM mode
operation. The Schottky diode handles the freewheeling
inductor current after the p-channel MOSFET is turned off.
The current rating of the Schottky is based on the maximum
load current in PSM mode with the conduction time being the
greatest at maximum input voltage. Combined with the
maximum load current of 200 mA, the Schottky must be able
to conduct 200 mA continuously. Since the forward voltage
drop of the diode, V
F
, determines the conduction losses, select
the diode with the lowest V
to maximize the converter’s
efficiency. The diode should also be selected for fast switching
speed to improve efficiency. The diode must be connected
from the L
X
pin to GND.
Over Temperature Protection
Si9177 includes an over temperature protection circuit to
prevent thermal runaway in the MOSFET switch. If the junction
temperature reaches 165 C, an internal soft-start capacitor is
discharged, shutting down the output stage. The converter
remains disabled until the junction temperature falls below
140 C, allowing the converter to resume operation.
TYPICAL CHARACTERISTICS (25 C UNLESS NOTED)
100
120
140
160
180
200
220
240
2
3
4
5
6
7
Supply Current vs. Input Voltage
0
50
100
150
200
250
300
350
400
450
500
0
50
100
150
200
Current (mA)
60
80
100
120
140
160
180
2
3
4
5
6
7
Voltage (V)
PSM Mode
BP Mode
Voltage (V)
r
DS(on)
vs. Input Voltage
Switching Frequency vs. Load Current
85 C
25 C
-25 C
70.00
75.00
80.00
85.00
90.00
95.00
100.00
0
50
100
150
200
250
Current (mA)
V
IN
= 3.6 V
Efficiency vs. Load Current
V
OUT
= 3.3 V
V
OUT
= 3.0 V
V
OUT
= 2.2 V
V
IN
= 4.0 V
V
IN
= 6.0 V
C
E
r
D
F
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|---|---|
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