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| 型号： | TPS51020DBTG4 |
| 厂商： | Texas Instruments |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC DUAL DC/DC SYNC CTRLR 30TSSOP |
| 标准包装： | 60 |
| 应用： | 控制器，DDR，DDR2 |
| 输入电压： | 4.5 V ~ 28 V |
| 输出数： | 2 |
| 输出电压： | 0.9 V ~ 24 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 30-TFSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 30-TSSOP |
| 包装： | 管件 |
| 配用： | 296-18958-ND - EVAL MODULE FOR TPS51020-001 296-17268-ND - EVALUATION MODULE FOR TPS51100 296-12357-ND - EVAL MOD FOR TPS2330-185 |
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TPS51020
SLUS564C ? JULY 2003 ? REVISED OCTOBER 2008
APPLICATION INFORMATION
ENABLE AND SOFT-START
Each SMPS is switched into standby mode separately by grounding the corresponding ENBLx pin. The 5-V
supply is enabled if either the DDR, ENBL1 or ENBL2 pin(s) goes high ( >2.2 V).
Softstart of each SMPS is achieved by slowly ramping the error amplifier reference voltage by following a
buffered version of the SSTRTx pin voltage. Designers can achieve their own start-up sequencing by simply
provide external timing signals since the startup times do not depend on the load current. The softstart time is
programmable by external capacitor connected from SSTRTx pin to the ground. Each SSTRTx pin sources
constant current, typically 2.3 μ A. The output voltage of the SMPS ramps up from 0 V to its target regulation
voltage as the SSTRTx pin voltage increases from 0 V to 1.2 V. This gives the softstart time formula to be,
C SSTRT (Farads) +
T SSTRT (sec)
1.2
2.3
10 * 6
The soft-start capacitor is discharged upon UVLO, OVP or UVP is detected as well as ENBLx is set low.
OUTPUT DISCHARGE (SOFT-STOP)
When an SMPS is turned off by ENBLx asserted low or the part enters a fault mode, both top and bottom drivers
are turned off. This may leave the output in a high impedance state that allows the voltage to persist for some
time. Output voltage should be discharged prior to the next power up. To achieve this, connect the output to the
VO1_VDDQ or VO2 pins.
These pins turn on a 6- ? resistor to ground during an off or fault condition. Both the VO1_VDDQ and VO2 pin
must be discharged to 0.3 V before the TPS51020 restarts. The TPS51020 has the flexibility of adding a resistor
in series with the VOx pin and the output voltage in order to reduce the discharge current and reduce the total
power dissipation within the device. It should be noted that when this resistor is added the discharged voltage
threshold changes according to the following equation:
V DISCHARGE +
R EXTERNAL ) R DS(on)
R DS(on)
0.3
where
D R EXTERNAL is the series resistor between VOx and the output
D R DS(on) = 6 ?
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS51020DBTR | 功能描述:DC/DC 开关控制器 Dual DDR selectable Sync buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51020DBTRG4 | 功能描述:DC/DC 开关控制器 Dual DDR selectable Sync buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51020EVM-001 | 功能描述:电源管理IC开发工具 TPS51020-001 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS5102DBT | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER |
| TPS5102IDBR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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