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| 型号： | TPS40077PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 6/43页 |
| 文件大小： | 847K |
| 代理商： | TPS40077PWPRG4 |
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APPLICATION INFORMATION
MINIMUM PULSE DURATION
SLEW RATE LIMIT ON VDD
15
9
16
13
12
10
ILIM
HDRV
SW
LDRV
VDD
PGND
TPS40077
C
R
VIN
S0203-01
+
_
SLUS714D – JANUARY 2007 – REVISED APRIL 2009 ..................................................................................................................................................... www.ti.com
The TPS40077 allows the user to construct synchronous voltage-mode buck converters with inputs ranging from
4.5 V to 28 V and outputs as low as 700 mV. Predictive Gate Drive circuitry optimizes switching delays for
increased efficiency and improved converter output-power capability. Voltage feed-forward is employed to ease
loop compensation for wide-input-range designs and provide better line transient response.
The TPS40077 incorporates circuitry to allow startup into a preexisting output voltage without sinking current
from the source of the preexisting output voltage. This avoids damaging sensitive loads at start-up. An integrated
power-good indicator is available for logic (open-drain) output of the condition of the output of the converter.
The TPS40077 devices have limitations on the minimum pulse duration that can be used to design a converter.
Reliable operation is assured for nominal pulse durations of 150 ns and above. This places some restrictions on
the conversion ratio that can be achieved at a given switching frequency. Figure 14 shows minimum output
voltage for a given input voltage and frequency.
The regulator that supplies power for the drivers on the TPS40077 requires a limited rising slew rate on VDD for
proper operation if the input voltage is above 10 V. If the slew rate is too great, this regulator can overshoot and
damage to the part can occur. To ensure that the part operates properly, limit the slew rate to no more than
0.12 V/
s as the voltage at VDD crosses 8 V. If necessary, an R-C filter can be used on the VDD pin of the
device. Connect the resistor from the VDD pin to the input supply of the converter. Connect the capacitor from
the VDD pin to PGND. There should not be excessive (more than a 200-mV) voltage drop across the resistor in
normal operation. This places some constraints on the R-C values that can be used. Figure 22 is a schematic
fragment that shows the connection of the R-C slew rate limit circuit. Equation 1 and Equation 2 give values for R
and C that limit the slew rate in the worst-case condition.
Figure 22. Limiting the Slew Rate
14
Copyright 2007–2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS40077
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相关代理商/技术参数 |
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| TPS40090 | 制造商:TI 制造商全称:Texas Instruments 功能描述:HIGH FREQUENCY MULTIPHASE CONTROLLER |
| TPS40090EVM-001 | 功能描述:电源管理IC开发工具 TPS40090-001 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 |
| TPS40090EVM-002 | 功能描述:电源管理IC开发工具 TPS40090-002 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 |
| TPS40090PW | 功能描述:DC/DC 开关控制器 4 Ch Multiphase Buck DC/DC 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 |
| TPS40090PW | 制造商:Texas Instruments 功能描述:CONTROLLER IC |
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