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参数资料
| 型号： | SI9122EDQ-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM VM 20-TSSOP |
| 标准包装： | 3,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 占空比： | 95% |
| 电源电压： | 10.5 V ~ 13.2 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
Si9122E
Vishay Siliconix
500-kHz Half-Bridge DC/DC Controller
with Integrated Secondary Synchronous Rectification Drivers
DESCRIPTION
FEATURES
Si9122E is a half-bridge controller IC ideally suited to fixed
telecom applications where high efficiency is required at low
?
?
92 % primary/secondary duty cycle
135 °C over temperature protection
output voltages (e.g. < 3.3 V). Designed to operate within the
fixed telecom voltage range of 36 V to 75 V, the IC is capable
?
?
Compatible with ETSI 300 132-2
28 V to 75 V input voltage range
RoHS
COMPLIANT
of controlling and driving both the low and high-side switching
devices of a half bridge circuit and also controlling the
switching devices on the secondary side of the bridge. Due
to the very low on-resistance of the secondary MOSFETs, a
significant increase in conversion efficiency can be achieved
as compared with conventional Schottky diodes. Control of
the secondary devices is by means of a pulse transformer
and a pair of inverters. Such a system has efficiencies well in
excess of 90 % even for low output voltages.
On-chip control of the dead time delays between the primary
and secondary synchronous signals keep efficiencies high
and prevent shorting of the power transformer. An external
resistor sets the oscillator frequency from 200 kHz to
500 kHz.
?
?
?
?
?
?
?
?
?
?
Integrated ± 1 A half bridge primary drivers
Secondary synchronous rectifier control signals with
programmable deadtime delay
Voltage mode control
Voltage feedforward compensation
High voltage pre-regulator operates during start-up
Current sensing on low-side primary device
Frequency foldback eliminates constant current tail
Advanced maximum current control during start-up and
shorted load
Low input voltage detection
Programmable soft-start function
Si9122E has advanced current monitoring and control
circuitry which allow the user to set the maximum current in
the primary circuit. Such a feature acts as protection against
output shorting and also provides constant current into large
APPLICATIONS
? Network cards
? Power supply modules
capacitive loads during start-up or when paralleling power
supplies. Current sensing is by means of a sense resistor on
?
?
Distributed power systems
Intermediate bus converter
the low-side primary device.
? Brick converter
FUNCTIONAL BLOCK DIAGRAM AND PIN CONFIGURATION
36 V to 75 V
BST
Synchrono u s
Rectifiers
DH
LX
1 V to 12 V Typ.
+
Si9122E
DL
CS2
V OUT
-
V I N DET
CS1
C L_CO N T
SR H
Error
SR L
V CC
Amplifier
+
EP
Figure 1.
Opto Isolator
-
V REF
Document Number: 73866
S-80112-Rev. D, 21-Jan-08
www.vishay.com
1
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相关代理商/技术参数 |
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| SI9123 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:500-kHz Half-Bridge DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
| SI9124 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
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| SI9124DQ-T1 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
| SI9124DQ-T1-E3 | 制造商:Vishay Siliconix 功能描述:IC DRIVER PUSH PULL 9124 TSSOP16 |
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