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参数资料
| 型号： | TPS40050PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 20/36页 |
| 文件大小： | 648K |
| 代理商： | TPS40050PWP |
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TPS40050
TPS40051
TPS40053
SLUS540F DECEMBER 2002 REVISED JUNE 2004
www.ti.com
27
DESIGN EXAMPLE
The poles and zeros for a type III network are described in equations (25) and (26).
f
Z2 +
1
2
p
R1
C3
N C3 +
1
2
p
100 k
W
4.93 kHz
+ 323 pF, choose 330 pF
f
P2 +
1
2
p
R3
C3
N R3 +
1
2
p
330 pF
73.3 kHz
+ 6.55 kW, choose 6.49 kW
f
C +
1
2
p
R1
C2
G
N C2 +
1
2
p
100 k
W
3.29
20 kHz
+ 24.2 pF, choose 22 pF
f
P1 +
1
2
p
R2
C2
N R2 +
1
2
p
22 pF
73.3 kHz
+ 98.2 kW, choose 97.6 kW
f
Z1 +
1
2
p
R2
C1
N C1 +
1
2
p
97.6 k
W
4.93 kHz
+ 331 pF, choose 330 pF
Calculate the value of RBIAS from equation (23) with R1 = 100 k.
R
BIAS +
0.7 V
R1
V
O * 0.7 V
+ 0.7 V
100k
W
3.3 V
* 0.7 V +
26.9 k
W, choose 26.7 kW
CALCULATING THE BOOST AND BP10V BYPASS CAPACITANCE
The size of the bypass capacitor depends on the total gate charge of the MOSFET being used and the amount
of droop allowed on the bypass cap. The BOOST capacitance for the Si7860DP, allowing for a 0.5 voltage droop
on the BOOST pin from equation (29) is:
C
BOOST +
Qg
DV
+ 18 nC
0.5 V
+ 36 nF
and the BP10V capacitance from (30) is
C
BP(10 V) +
Q
gHS ) QgSR
DV
+
2
Qg
DV
+ 36 nC
0.5 V
+ 72 nF
For this application, a 0.1-
F capacitor is used for the BOOST bypass capacitor and a 1.0-F capacitor is used
for the BP10V bypass.
Figure 15 shows component selection for the 10-V to 24-V to 3.3-V at 8 A dc-to-dc converter specified in the
design example. For an 8-V input application, it may be necessary to add a Schottky diode from BP10 to BOOST
to get sufficient gate drive for the upper MOSFET. As seen in Figure 7, the BP10 output is about 6 V with the
input at 8 V so the upper MOSFET gate drive may be less than 5 V.
REFERENCES
1.
Balogh, Laszlo, Design and Application Guide for High Speed MOSFET Gate Drive Circuits, Unitrode
Power Supply Design Seminar, SEM1400 Topic 2 (SLUP169)
2.
PowerPAD Thermally Enhanced Package, Technical Brief (SLMA002)
3.
Effect of Programmable UVLO on Maximum Duty Cycle Achievable with the TPS4005x and TPS4006x
Family of Synchronous Buck Controllers Application Note (SLUA310)
(75)
(76)
(77)
(78)
(79)
(80)
(81)
(82)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40050PWPG4 | 功能描述:DC/DC 开关控制器 Wide Input Vltg 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 |
| TPS40050PWPR | 功能描述:DC/DC 开关控制器 Wide Input Vltg 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 |
| TPS40050PWPRG4 | 功能描述:DC/DC 开关控制器 Wide Input Vltg 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 |
| TPS40050-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40050QPWPRQ1 | 功能描述:DC/DC 开关控制器 Auto Cat Wide-Input Synch Buck 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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