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| 型号： | SI9121DY-5-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 3/11页 |
| 文件大小： | 0K |
| 描述： | IC CONV ISDN PWR SUPPLY 8SOIC |
| 标准包装： | 2,500 |
| 应用： | 转换器，ISDN 电源 |
| 输入电压： | -10 V ~ -60 V |
| 输出数： | 1 |
| 输出电压： | 5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
Si9121
Vishay Siliconix
SPECIFICATIONS a (All Voltages Are With Respect To V NEG Unless Otherwise Specified)
Test Conditions (Internally Regulated)
Unless Otherwise Specified
Limits
? 40 to 85 _ C
Parameter
Symbol
V NEG = ? 10 to ? 60 V
Temp b
Min c
Typ d
Max c
Unit
Supply
Supply Current
(Internally Regulater)
I GND
GND to V NEG
Full
1.2
1.5
Supply Current
(External V CC Applied)
V OUT supply Current
Start-Up Current
I CC
I OUT
I START
V CC to V NEG +10 V; V NEG > ? 20 V
V OUT to V NEG
V CC = 0 V
Full
Full
Full
1.5
0.2
5
2.0
0.3
30
mA
Thermal Shutdown
Thermal Shutdown Temperature
Thermal Hysteresis
T OTP
T HYS
170
25
_ C
Efficiency
Efficiency
400-mA Output, V NEG = ? 48 V
+5 V
+3.3 V
Room
Room
77
73
%
Notes
a. Refer to PROCESS OPTION FLOWCHART for additional information.
b. Room = 25 _ C, Full = as determined by the operating temperature suffix.
c. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum.
d. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
DETAILED BLOCK DIAGRAM
V OUT
5
R1*
V CC
10 m A
2 m A
V NEG
4
COMP
?
+
GM
3.5 V
+
?
H
Soft Start
GND
6
R2*
+
?
V REF
1.25 V
1.5 V
?
+
L
Hiccup Discharge Mode
OSC
OTP
V CC
7
Low Side
Error Amp
0.6 V
?
+
50% Max.
PWM Duty Cycle
R
Q
? V IN
8
L X
S
BYPASS
3
Bias/
Reference
Circuit
0.67 V
+
?
OCL
?
1
CS
?
+
+
0.6-V Hysteresis
V NEG
2
8.5 V
+
?
*R1 and R2 are internal voltage setting resistors used to set
output voltage to fixed 3.3 V or 5 V.
Document Number: 71112
S-40708—Rev. C, 19-Apr-04
www.vishay.com
3
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