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参数资料
| 型号： | SI9110DYT1-E3 |
| 厂商： | Vishay Intertechnology,Inc. |
| 英文描述： | High-Voltage Switchmode Controllers |
| 中文描述： | 高电压开关模式控制器 |
| 文件页数： | 6/8页 |
| 文件大小： | 116K |
| 代理商： | SI9110DYT1-E3 |
Si9110/9111
Vishay Siliconix
www.vishay.com
6
Document Number: 70004
S-42037—Rev. H, 15-Nov-04
DETAILED DESCRIPTION (CONT’D)
Applications which use a separate external reference, such as
non-isolated converter topologies and circuits employing
optical coupling in the feedback loop, do not require a trimmed
voltage
reference
with
1%
accommodates the requirements of these applications at a
lower cost, by leaving the reference voltage untrimmed. The
10% accurate reference thus provided is sufficient to establish
a dc bias point for the error amplifier.
accuracy.
The
Si9111
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 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.
Oscillator Section
The oscillator consists of a ring of CMOS inverters, capacitors,
and a capacitor discharge switch. Frequency is set by an
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
frequency to one half of the oscillator frequency.
50% by locking the switching
Remote synchronization is accomplished by capacitive
coupling of a positive SYNC pulse into the OSC IN (pin 8)
terminal. For a 5-V pulse amplitude and 0.5- s pulse width,
typical values would be 100 pF in series with 3 k
to pin 8.
SHUTDOWN and RESET
SHUTDOWN (pin 11) and RESET (pin 12) 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.
Table 1:
Truth Table for the SHUTDOWN and RESET Pins
SHUTDOWN
RESET
Output
H
H
Normal Operation
H
Normal Operation (No Change)
L
H
Off (Not Latched)
L
L
Off (Latched)
L
Off (Latched, No Change)
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.
Output Driver
The push-pull driver output has a typical on-resistance of 20 .
Maximum switching times are specified at 75 ns for a 500-pF
load. This is sufficient to directly drive MOSFETs such as the
2N7004, 2N7005, IRFD120 and IRFD220. Larger devices can
be driven, but switching times will be longer, resulting in higher
switching losses. In order to drive large MOSPOWER devices,
it is necessary to use an external driver IC, such as the
Vishay Siliconix D469A. The D469A can switch very large
devices such as the SMM20N50 (500 V, 0.3
approximately 100 ns.
) in
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PDF描述 |
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| SI9111DJ-E3 | High-Voltage Switchmode Controllers |
| SI9112 | High-Voltage Switchmode Controller |
| SI9112DJ | High-Voltage Switchmode Controller |
| SI9112DJ-E3 | High-Voltage Switchmode Controller |
| SI9112DY | High-Voltage Switchmode Controller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SI9110DY-T1-E3 | 制造商:Vishay Siliconix 功能描述:Switchmode Controller IC |
| SI9111 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:High-Voltage Switchmode Controllers |
| SI9111DJ | 功能描述:开关变换器、稳压器与控制器 HV Switchmode Cont 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 |
| SI9111DJ-E3 | 功能描述:开关变换器、稳压器与控制器 HV Switchmode Cont 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 |
| SI9111DJ-T1 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:High-Voltage Switchmode Controllers |
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