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参数资料
| 型号： | SI9121DY-3-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 2/11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： | 3V |
| 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
ABSOLUTE MAXIMUM RATINGS (ALL VOLTAGES REFERENCED TO GND = 0 V)
V NEG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? 63 V
V CS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V NEG ? 0.3 V to V CC + 0.3 V
V CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V NEG + 13.2 V
I LX (peak current ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 A
V OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Bypass, CS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V NEG ? 0.3 V to V CC +0.3 V
(V LX ? V CS ) internal power MOSFET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 V
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? 65 to 150 _ C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 _ C
Power Dissipation (Package) a
8-Pin SOIC (Y Suffix) b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25 W
Thermal Impedance ( Q JA ) a
8-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 _ C/W
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 10 mW/ _ C above 25 _ C.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE (ALL VOLTAGES REFERENCED TO GND = 0 V)
V NEG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? 10 V to ? 60 V
V CC (internally regulated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V NEG + 8.5 V
V CC (externally supplied) . . . . . . . . . . . . . . . . V NEG + 9.5 V to V NEG + 12.0 V
Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to V CC
RECOMMENDED EXTERNAL COMPONENTS ( SEE TYPICAL APPLICATIONS CIRCUIT )
L = 68 m H, C OUT = 220 m F // 0.1 m F, CIN = 33 m F, C BYPASS = 0.1 m F, C VCC = 1 m F, R SENSE = 0.25 W , 0.5 W
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
Output Voltage (with respect to GND = 0 V)
+5-V Converter
+3.3-V Converter
V OUT
10 mA <I LOAD < 250 mA
Full
Full
4.80
3.17
5.00
3.30
5.20
3.43
V
Line Regulation (with respect to GND = 0 V)
Line Regulation
? 60 V v V NEG v ? 40 V
Full
1
%
V CC (Internal Regulator)
V CC Bias Voltage
V CC
Full
7.5
8.5
9.5
V
UVLO
Under Voltage Lockout
V CC ?
V NEG
Turn-On
Full
6.6
7.6
8.7
V
Hysteresis
D V
Room
0.6
Soft-Start
Error Amplifier Start-Up Current
I SS
V OUT = 0 V
Room
10
m A
Oscillator
Switching Frequency
f OSC
Room
80
95
110
kHz
Error Amplifier
Transconductance
Clamp Voltage
gm
V CL
Internal Error Amplifier
Output Clamp Voltage
Room
Room
10
15
3.5
20
umho
V
Current Limit
Threshold Voltage
V CS
Full
0.57
0.67
0.77
V
MOSFET Switch
N-Channel MOSFET
r DS(on)
Room
1.5
2.5
W
www.vishay.com
2
Document Number: 71112
S-40708—Rev. C, 19-Apr-04
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