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| 型号： | SI9100DJ02-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 4V 14DIP |
| 标准包装： | 500 |
| 类型： | 降压（降压），升压（升压），回扫，正向转换器，隔离式 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 4V |
| 输入电压： | 10 V ~ 70 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 40kHz ~ 1MHz |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 14-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 14-PDIP |
Si9100
Vishay Siliconix
DETAILED DESCRIPTION (CONT’D)
Note: During start-up or when V CC drops below 9.4 V the
start-up circuit is capable of sourcing up to 20 mA. This may
lead to a high level of power dissipation in the IC (for a 48-V
input, approximately 1 W). Excessive start-up time caused by
external loading of the V CC supply can result in device
damage. Figure 4 gives the typical pre-regulator current at
start-up as a function of input voltage.
BIAS
To properly set the bias for the Si9100, a 390-k W resistor
should be tied from BIAS to ? V IN . This determines the
magnitude of bias current in all of the analog sections and the
pull-up current for the SHUTDOWN and RESET pins. The
current flowing in the bias resistor is nominally 15 m A.
Reference Section
The reference section of the Si9100 consists of a temperature
compensated buried zener and trimmable divider network.
The output of the reference section is connected internally to
the non-inverting input of the error amplifier. Nominal reference
output voltage is 4 V. During the reference trimming procedure
the error amplifier is connected for unity gain in order to
compensate for the input offset voltage in the error amplifier.
The output impedance of the reference section has been
purposely made high so that a low impedance external voltage
source can be used to override the internal voltage source, if
desired, without otherwise altering the performance of the
device.
external resistor between the OSC IN and OSC OUT pins.
(See Figure 5 for details of resistor value vs. frequency.) The
DISCHARGE pin should be tied to ? V IN for normal internal
oscillator operation. A frequency divider in the logic section
limits switch duty cycle to v 50% by locking the switching
frequency to one half of the oscillator frequency.
Remote synchronization is accomplished by capacitive
coupling of a positive SYNC pulse into the OSC IN terminal.
For a 5-V pulse amplitude and 0.5- m s pulse width, typical
values would be 100 pF in series with 3 k W to OSC IN.
SHUTDOWN and RESET
SHUTDOWN and RESET are intended for overriding the
output MOSFET switch via external control logic. The two
inputs are fed through a latch preceding the output switch.
Depending on the logic state of RESET, SHUTDOWN can be
either a latched or unlatched input. The output is off whenever
SHUTDOWN is low. By simultaneously having SHUTDOWN
and RESET low, the latch is set and SHUTDOWN has no effect
until RESET goes high. The truth table for these inputs is given
in Table 1.
Both pins have internal current source pull-ups and should be
left disconnected when not in use. An added feature of the
current sources is the ability to connect a capacitor and an
open-collector driver to the SHUTDOWN or RESET pins to
provide variable shutdown time.
Table 1. Truth Table for the SHUTDOWN and RESET
Pins
SHUTDOWN
RESET
Output
Error Amplifier
Closed-loop regulation is provided by the error amplifier, which
is intended for use with “around-the-amplifier” compensation.
A MOS differential input stage provides for low input leakage
current. The noninverting input to the error amplifier (V REF ) is
internally connected to the output of the reference supply and
should be bypassed with a small capacitor to ground.
H
H
L
L
H
H
L
L
Normal Operation
Normal Operation (No Change)
Off (Not Latched)
Off (Latched)
Off (Latched, No Change)
Output Switch
Oscillator Section
The oscillator consists of a ring of CMOS inverters, capacitors,
and a capacitor discharge switch. Frequency is set by an
www.vishay.com
6
The output switch is a 5- W , 150-V lateral DMOS device. Like
discrete MOSFETs, the switch contains an intrinsic body-drain
diode. However, the body contact in the Si9100 is connected
internally to ? V IN and is independent of the SOURCE.
Document Number: 70000
S-42041—Rev. G, 15-Nov-04
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| SI9100DN02 | 功能描述:直流/直流开关转换器 3W HV Switchmode Reg RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| SI9100DN02-E3 | 功能描述:开关变换器、稳压器与控制器 3W HV Switchmode Reg RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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| SI9102_07 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:3-W High-Voltage Switchmode Regulator |
| SI9102DJ02 | 功能描述:开关变换器、稳压器与控制器 3W HV Switchmode Reg RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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