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| 型号： | TPS40060PWPG4 |
| 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, HTSOOP-16 |
| 文件页数： | 6/33页 |
| 文件大小： | 750K |
| 代理商： | TPS40060PWPG4 |
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CALCULATING THE OUTPUT CAPACITANCE
DV + DI ESR )
1
8
C
O
f
SW
V
P*P
(13)
E
L +
1
2
L
I2 (J)
(14)
I2 +
I
OH
2
* IOL
2
(Amperes)
2
(15)
E
C +
1
2
C
V2 (J)
(16)
V2 + Vf
2
* Vi
2
Volts2
(17)
C
O +
L
I
OH
2
* IOL
2
V
f
2
* Vi
2
(F)
(18)
Loop Compensation
SLUS543E – DECEMBER 2002 – REVISED JUNE 2006
APPLICATION INFORMATION (continued)
The output capacitance depends on the output ripple voltage requirement, output ripple current, as well as any
output voltage deviation requirement during a load transient.
The output ripple voltage is a function of both the output capacitance and capacitor ESR. The worst case output
ripple is described in Equation 13.
The output ripple voltage is typically between 90% and 95% due to the ESR component.
The output capacitance requirement typically increases in the presence of a load transient requirement. During a
step load, the output capacitance must provide energy to the load (light to heavy load step) or absorb excess
inductor energy (heavy-to-light load step) while maintaining the output voltage within acceptable limits. The
amount of capacitance depends on the magnitude of the load step, the speed of the loop and the size of the
inductor.
Stepping the load from a heavy load to a light load results in an output overshoot. Excess energy stored in the
inductor must be absorbed by the output capacitance. The energy stored in the inductor is described in
where:
I
OH is the output current under heavy load conditions
I
OL is the output current under light load conditions
Energy in the capacitor is given by the following equation:
where:
V
f is the final peak capacitor voltage
V
i is the initial capacitor voltage
By substituting Equation 14 into Equation 13, substituting Equation 16 into Equation 15, setting Equation 13
Voltage-mode buck-type converters are typically compensated using Type III networks. Since the TPS40060
and TPS40061 use voltage feedforward control, the gain of the PWM modulator with voltage feedforward circuit
must be included. The modulator gain is described in Figure 7, with VIN being the minimum input voltage
required to cause the ramp excursion to cover the entire switching period.
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40060PWPR | 功能描述:DC/DC 开关控制器 Wide Input Freq 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 |
| TPS40060PWPRG4 | 功能描述:DC/DC 开关控制器 Wide Input Freq 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 |
| TPS40061 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40061PWP | 功能描述:DC/DC 开关控制器 Wide Input Sync Buck Cntrlr source/sink 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 |
| TPS40061PWP | 制造商:Texas Instruments 功能描述:IC 制造商:Texas Instruments 功能描述:IC, SYNC BUCK DC/DC CONTROLLER, 16-HTSSOP |
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