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| 型号： | TPS40304DRCR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件页数： | 8/31页 |
| 文件大小： | 1798K |
| 代理商： | TPS40304DRCR |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页
OUT
CHARGE
SS
V
C
1.8 V
2
22 F
I
0.053 A
t
1.5 ms
m
=
(
)
1
OUT(max)
RIPPLE
CHARGE
L peak
2
I
10 A
3.5 A
0.053 A
11.8 A
=
+
=
+
+
=
LOAD
OUT
IN(min)
RIPPLE(cap)
IN
SW
I
V
10 1.8 V
C
12.5 F
V
f
150mV 8 V 1200kHz
=
m
RIPPLE(esr )
MAX
1
LOAD
RIPPLE
2
V
150 m V
ESR
12.7 m
I
11.75 A
=
W
+
(
)
(
)
LO A D
R M S
R M S cin
I
D
1
D
10 A
0.225
(1
0.225 )
4.17 A
=
-
=
-
=
=
=
BOOST
G2
C
20
Q
20
5 nC
100 nF
SLUS964 – NOVEMBER 2009
www.ti.com
Peak Current Rating of Inductor
With output capacitance, it is possible to calculate the charge current during start-up and determine the minimum
saturation current rating for the inductor. The start-up charging current is approximated by Equation 9.
(9)
(10)
Table 2. Inductor Requirements
SYMBOL
PARAMETER
VALUE
UNITS
L
Inductance
400
nH
IL(rms)
RMS current (thermal rating)
10.05
A
IL(peak)
Peak current (saturation rating)
11.8
A
A PG0083.401, 400 nH inductor is selected for its small size, low DCR (3.0m
Ω) and high-current handling
capability (17-A thermal, 27-A saturation).
Input Capacitor Selection (C8)
The input voltage ripple is divided between capacitance and ESR. For this design VRIPPLE(cap) = 150 mV and
(11)
(12)
The RMS current in the input capacitors is estimated by Equation 13.
(13)
Two 1210, 10-F, 25-V, X5R ceramic capacitors with approximately 2-m
Ω of ESR and a 2.5-A RMS current
rating each are selected. Higher voltage capacitors are selected to minimize capacitance loss at the DC bias
voltage to ensure the capacitors allow sufficient capacitance at the working voltage.
MOSFET Switch Selection (Q1 and Q2)
Reviewing available TI NexFET MOSFETs using TI’s NexFET MOSFET selection tool, the CSD16410Q5A and
CSD16322Q5 5 mm × 6 mm MOSFETs are selected.
These two FETs have maximum total gate charges of 5 nC and 10 nC respectively, which draws 18 mA at 1.2
MHz from the BP regulator, less than its 50 mA minimum rating.
Bootstrap Capacitor (C6)
To ensure proper charging of the high-side FET gate, limit the ripple voltage on the boost capacitor to less than
50 mV.
(14)
VDD Bypass Capacitor (C7)
Per the TPS40305 Electrical Characteristics specifications, select a 1.0-F X5R or better ceramic bypass
capacitor for VDD.
BP Bypass Capacitor (C5)
As listed in the Electrical Characteristics table, a minimum of 1.0-F ceramic capacitance is required to stabilize
the BP regulator. To limit regulator noise to less than 10 mV, the value of the bypass capacitor is calculated in
16
Copyright 2009, Texas Instruments Incorporated
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| TPS40305DRCR | 功能描述:DC/DC 开关控制器 3-20V Wide Input Sync Buck Controller 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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