參數(shù)資料
型號(hào)： SI9122A
廠商： Vishay Intertechnology,Inc.
英文描述： 500-kHz Half-Bridge DC/DC Controller With Integrated Secondary Synchronous Rectification Drivers
中文描述： 500千赫半橋DC / DC變換器與集成的次級(jí)同步整流驅(qū)動(dòng)器控制器
文件頁(yè)數(shù)： 2/15頁(yè)
文件大?。?/td> 241K
代理商： SI9122A
Si9122A
Vishay Siliconix
www.vishay.com
2
Document Number: 73492
S–51921—Rev. A, 12-Sep-05
Si9122A is a voltage mode controller for the half-bridge
topology. With 100-V depletion mode MOSFET capability, the
Si9122A is capable of powering directly from the high voltage
bus to V
CC
through an external PNP pass transistor, or may be
powered through an external regulator directly through the
V
CC
pin. With PWM control, Si9122A provides peak efficiency
throughout the entire line and load range. In order to simplify
the design of efficient secondary synchronous rectification
circuitry, Si9122A provides intelligent gate drive signals to
control the secondary MOSFETs. With independent gate drive
signals from the controller, transformer design is no longer
limited by the gate to source rating of the secondary–side
MOSFETs. Si9122A provides constant V
GS
voltage,
independent of line voltage to minimize the gate charge loss
as well as conduction loss. A break-before-make function is
included to prevent shoot through current or transformer
shorting. Adjustable Break-Before-Make time is incorporated
into the IC and is programmable by an external resistor value.
Si9122A is packaged in lead (Pb)–free
TSSOP-20 and
MLP65-20
packages. To satisfy stringent ambient tempe–
rature requirements, Si9122A is rated to handle the industrial
temperature range of –40 to 85 C. When a situation arises
which results in a rapid increase in primary (or secondary
current) such as output shorted or start-up with a large output
capacitor, control of the PWM generator is handed over to the
the current loop. Monitoring of the load current is by means of
an external current sense resistor in the source of the primary
low-side switch.
V
REF
–
+
Pre-Regulator
–
+
–
+
REG_COMP
V
INDET
V
REF
V
IN
+
–
Error Amplifier
132 k
EP
–
+
PWM
Comparator
SS
–
+
CS2
CS1
Over Current Protection
GND
V
UVLO
V
UV
V
SD
V
CC
Duty Cycle
Control
C
L_CONT
Driver
Control
and
Timing
BBM
OTP
OSC
R
OSC
V
FF
Ramp
SR
L
SR
H
PGND
D
L
D
H
SYNC
Driver Low
SYNC
Driver High
Low-Side
Driver
High-Side
Primary
Driver
Int
BST
L
X
Si9122
Peak DET
Figure 2.
VREF
2
60 k
I
SS
8.8 V
550 mV
20 A
8 V
9.1 V
V
CC
V
CC
V
CC
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SI9122A_08 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers
SI9122ADLP-T1-E3 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
SI9122ADQ-T1-E3 功能描述:DC/DC 開關(guān)控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
SI9122DLP-T1-E3 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
SI9122DQ 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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