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| 型号： | TPS40052PWP |
| 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： | 19/33页 |
| 文件大小： | 753K |
| 代理商： | TPS40052PWP |
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TPS40052
SLUS563C AUGUST 2003 REVISED FEBRUARY 2005
26
www.ti.com
DESIGN EXAMPLE
The poles and zeros for a type III network are described in equations (21) and (22).
f
Z2 +
1
2
p
R1
C3
N C3 +
1
2
p
100 k
W
3.05 kHz
+ 522 pF, choose 560 pF
f
P2 +
1
2
p
R3
C3
N R3 +
1
2
p
560 pF
28.2 kHz
+ 10.08 kW, choose 10 kW
f
C +
1
2
p
R1
C2
G
N C2 +
1
2
p
100 k
W
7.14
20 kHz
+ 11.1 pF, choose 10 pF
f
P1 +
1
2
p
R2
C2
N R2 +
1
2
p
10 pF
28.2 kHz
+ 564 kW, choose 562 kW
f
Z1 +
1
2
p
R2
C1
N C1 +
1
2
p
562 k
W
3.05 kHz
+ 92.9 pF, choose 100 pF
Calculate the value of RBIAS from equation (17) with R1 = 100 k. Since the output of 1.25-V is within the
EA_REF input specification of 0.5 V to 1.5 V, an RBIAS resistor is not required.
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 (25) is:
C
BOOST +
Qg
DV +
18 nC
0.5 V
+ 36 nF
and the BP10V capacitance from (26) 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 10 shows component selection for the 10-V to 14.4-V to 1.25-V at 8 A dc-to-dc converter specified in the
design example.
REFERENCES
1.
Balogh, Laszlo, Design and Application Guide for High Speed MOSFET Gate Drive Circuits, Texas
Instruments/Unitrode Corporation, Power Supply Design Seminar, SEM1400 Topic 2.
2.
PowerPAD Thermally Enhanced Package Texas Instruments, Semiconductor Group, Technical Brief: TI
Literature No. SLMA002
(68)
(69)
(70)
(71)
(72)
(73)
(74)
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| TPS40052PWPG4 | 功能描述:DC/DC 开关控制器 Wide Input Sync Buck Cntrlr w/DDR trking 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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| TPS40052PWPRG4 | 功能描述:DC/DC 开关控制器 Wide Input Sync Buck Cntrlr w/DDR trking 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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