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| 型号： | TPS40054PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 33/35页 |
| 文件大小： | 866K |
| 代理商： | TPS40054PWPRG4 |
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APPLICATION INFORMATION
SETTING THE SWITCHING FREQUENCY (PROGRAMMING THE CLOCK OSCILLATOR)
R
T +
1
f
SW
17.82
10*6
* 17 kW
(1)
PROGRAMMING THE RAMP GENERATOR CIRCUIT
RAMP
COMP
SW
VIN
V
PEAK
V
VALLEY
T
ON1
> T
ON2
and
D
1
> D
2
T
2
t
ON2
T
1
t
ON1
VIN
RAMP
COMP
SW
D =
t
ON
T
UDG-08119
www.ti.com ...................................................................................................................................... SLUS593F – DECEMBER 2003 – REVISED SEPTEMBER 2008
The TPS40054/55/57 family of devices allows the user to optimize the PWM controller to the specific application.
The TPS40057 is safe for pre-biased outputs, not turning on the synchronous rectifier until the high-side FET has
already started switching.
The TPS40054 operates in one quadrant and sources output current only, allowing for paralleling of converters
and ensures that one converter does not sink current from another converter. This controller also emulates a
non-synchronous buck converter at light loads where the inductor current goes discontinuous. At continuous
output inductor currents the controller operates as a synchronous buck converter to optimize efficiency.
The TPS40055 operates in two quadrants, sourcing and sinking output current.
The TPS4005x has independent clock oscillator and ramp generator circuits. The clock oscillator serves as the
master clock to the ramp generator circuit. The switching frequency, fSW in kHz, of the clock oscillator is set by a
single resistor (RT) to ground. The clock frequency is related to RT, in k by Equation 1 and the relationship is
charted in Figure 2.
The ramp generator circuit provides the actual ramp used by the PWM comparator. The ramp generator provides
voltage feed-forward control by varying the PWM ramp slope with line voltage, while maintaining a constant ramp
magnitude. Varying the PWM ramp directly with line voltage provides excellent response to line variations since
the PWM does not have to wait for loop delays before changing the duty cycle. (See Figure 1).
Figure 1. Voltage Feed-Forward Effect on PWM Duty Cycle
The PWM ramp must be faster than the master clock frequency or the PWM is prevented from starting. The
PWM ramp time is programmed via a single resistor (RKFF) pulled up to VIN. RKFF is related to RT, and the
minimum input voltage, VIN(min) through the following:
Copyright 2003–2008, Texas Instruments Incorporated
7
Product Folder Link(s): TPS40054 TPS40055 TPS40057
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| TPS40055PWPG4 | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40055 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40055-EP | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40055EVM-001 | 功能描述:电源管理IC开发工具 Eval Mod Converter 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 |
| TPS40055EVM-002 | 功能描述:电源管理IC开发工具 Wide Input Range Converter 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 |
| TPS40055MPWPREP | 功能描述:DC/DC 开关控制器 Mil Enh Wide Input Synch Buck Cntrlr 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 |
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