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参数资料
| 型号： | SI9110DJ-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： | 5/8页 |
| 文件大小： | 116K |
| 代理商： | SI9110DJ-E3 |
BIAS
FB
+V
IN
COMP
SENSE
RESET
OUTPUT
SHUTDOWN
V
IN
V
REF
V
CC
DISCHARGE
OSC OUT
OSC IN
Dual-In-Line and SOIC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Top View
Si9110/9111
Vishay Siliconix
Document Number: 70004
S-42037—Rev. H, 15-Nov-04
www.vishay.com
5
PIN CONFIGURATIONS AND ORDERING INFORMATION
ORDERING INFORMATION
Part Number
Temperature Range
Package
Si9110DY
Si9110DY-T1
Si9110DY-T1—E3
Si9111DY
Si9111DY-T1
Si9111DY-T1—E3
Si9110DJ
Si9110DJ-—E3
Si9111DJ
Si9111DJ-—E3
SOIC-14
40 to 85 C
PDIP 14
PDIP-14
DETAILED DESCRIPTION
Pre-Regulator/Start-Up Section
Due to the low quiescent current requirement of the
Si9110/9111 control circuitry, bias power can be supplied from
the unregulated input power source, from an external
regulated low-voltage supply, or from an auxiliary “bootstrap”
winding on the output inductor or transformer.
When power is first applied during start-up, +V
IN
(pin 2) will
draw a constant current. The magnitude of this current is
determined by a high-voltage depletion MOSFET device
which is connected between +V
IN
and V
CC
(pin 6). This
start-up circuitry provides initial power to the IC by charging an
external bypass capacitance connected to the V
CC
pin. The
constant current is disabled when V
CC
exceeds 8.6 V. If V
CC
is
not forced to exceed the 8.6-V threshold, then V
CC
will be
regulated to a nominal value of 8.6 V by the pre-regulator
circuit.
As the supply voltage rises toward the normal operating
conditions, an internal undervoltage (UV) lockout circuit keeps
the output driver disabled until V
CC
exceeds the undervoltage
lockout threshold (typically 8.1 V). This guarantees that the
control logic will be functioning properly and that sufficient
gate drive voltage is available before the MOSFET turns on.
The design of the IC is such that the undervoltage lockout
threshold will be at least 300 mV less than the pre-regulator
turn-off voltage. Power dissipation can be minimized by
providing an external power source to V
CC
such that the
constant current source is always disabled.
Note:
During start-up or when V
CC
drops below 8.6 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 6 gives the typical pre-regulator current at
BiC/DMOS as a function of input voltage.
BIAS
To properly set the bias for the Si9110/9111, a 390-k resistor
should be tied from BIAS (pin 1) to
V
IN
(pin 5). This
determines the magnitude of bias current in all of the analog
sections and the pull-up current for the SHUDOWN and
RESET pins. The current flowing in the bias resistor is
nominally 15 A.
Reference Section
The reference section of the Si9110 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. The trimming procedure that is used on
the Si9110 brings the output of the error amplifier (which is
configured for unity gain during trimming) to within
This compensates for input offset voltage in the error amplifier.
1% of 4 V.
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.
相关PDF资料 |
PDF描述 |
|---|---|
| SI9110DYT1-E3 | High-Voltage Switchmode Controllers |
| SI9111DJ-E3 | High-Voltage Switchmode Controllers |
| SI9112 | High-Voltage Switchmode Controller |
| SI9112DJ | High-Voltage Switchmode Controller |
| SI9112DJ-E3 | High-Voltage Switchmode Controller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| Si9110DJ--E3 | 制造商:Vishay Intertechnologies 功能描述:Current Mode PWM Controller 14-Pin PDIP |
| SI9110DJ-E3 | 制造商:Vishay Siliconix 功能描述:Controller IC |
| SI9110DJ-T1 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:High-Voltage Switchmode Controllers |
| SI9110DWF | 制造商:Vishay Siliconix 功能描述:CONTROLLER - Tape and Reel |
| SI9110DY | 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 |
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