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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： | 14/33页 |
| 文件大小： | 750K |
| 代理商： | TPS40060PWPG4 |
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DESIGN EXAMPLE
1. Calculate maximum and minimum duty cycles
d
MIN +
V
O(min)
V
IN(max)
+ 0.0588
d
MAX +
V
O(max)
V
IN(min)
++ 0.187
(42)
2. Select switching frequency
V
O(min)
V
IN(max)
+
t
ON
T
SW
or
(43)
1
T
SW
+ fSW +
V
O(min)
V
IN(max)
T
ON
(44)
f
SW +
0.0588
400 ns +
147 kHz
(45)
3. Select
I
DI + IO
2
0.2 + 5
2
0.2 + 2.0 A
(46)
4. Calculate the power losses
I
RMS + IO
d + 5
0.0588 + 1.2 A
(47)
P
COND + 1.2
2
0.12
(1 ) 0.007
(150 * 25)) + 0.324 W
(48)
SLUS543E – DECEMBER 2002 – REVISED JUNE 2006
Input voltage: 18 VDC to 55 VDC
Output voltage: 3.3 V ±2%
Output current: 5 A (maximum, steady-state), 7 A (surge, 10-ms duration, 10% duty cycle maximum)
Output ripple: 33 mVP-P at 5 A
Output load response: 0.3 V => 10% to 90% step load change
Operating temperature: –40°C to 85°C
fSW = 130 kHz
The switching frequency is based on the minimum duty cycle ratio and the propagation delay of the current limit
comparator. In order to maintain current limit capability, the on time of the upper MOSFET, tON, must be greater
than 330 ns (see Electrical Characteristics table). Therefore
Using 400 ns to provide margin,
Since the oscillator can vary by 10%, decrease fSW, by 10%
fSW = 0.9 × 147 kHz = 130 kHz
and therefore choose a frequency of 130 kHz.
In this case
I is chosen so that the converter enters discontinuous mode at 20% of nominal load.
Power losses in the high-side MOSFET (Si9407AGY) at 55-VIN where switching losses dominate can be
calculated from Equation 46 through Equation 49.
substituting Equation 30 into Equation 29 yields
and from Equation 31, the switching losses can be determined.
21
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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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