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参数资料
| 型号： | TPS62700YZFR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.2 A SWITCHING REGULATOR, 2300 kHz SWITCHING FREQ-MAX, BGA8 |
| 封装： | LEAD FREE, WCSP-8 |
| 文件页数： | 13/25页 |
| 文件大小： | 856K |
| 代理商： | TPS62700YZFR |
Output Capacitor Selection
3
2
1
f
L
V
1
V
I
IN
OUT
RMSCout
-
=
(4)
÷
è
+
-
=
D
ESR
f
C
8
1
f
L
V
1
V
out
IN
OUT
(5)
Input Capacitor Selection
SLVS784B – DECEMBER 2007 – REVISED JUNE 2008................................................................................................................................................... www.ti.com
The advanced, fast-response, voltage-mode control scheme of the TPS6270x allows the use of tiny ceramic
capacitors. Ceramic capacitors with low ESR values have the lowest output-voltage ripple and are
recommended. The output capacitor requires either an X7R or X5R dielectric. Y5V and Z5U dielectric capacitors,
aside from their wide variation in capacitance over temperature, become resistive at high frequencies.
At nominal load current, the device operates in PWM mode, and the RMS ripple current is calculated as:
At nominal load current, the device operates in PWM mode and the overall output voltage ripple is the sum of the
voltage spike caused by the output capacitor ESR plus the voltage ripple caused by charging and discharging the
output capacitor:
Because of the nature of the buck converter due to its pulsating input current, a low-ESR input capacitor is
required for best input-voltage filtering, and to minimize interference with other circuits caused by high
input-voltage spikes. For most applications, a 10-
F ceramic capacitor is recommended. The input capacitor can
be increased without any limit for better input-voltage filtering.
Take care when using only small ceramic input capacitors. When a ceramic capacitor is used at the input and the
power is being supplied through long wires, such as from a wall adapter, a load step at the output or VIN step on
the input can induce ringing at the VIN pin. This ringing can couple to the output and be mistaken as loop
instability or could even damage the part by exceeding the maximum ratings.
List Of Capacitors
Size
Capacitance
F
TYPE
SUPPLIER
0603
4.7
GRM188R60J475K
Murata
0603
10
GRM188R60J106M
Murata
20
Copyright 2007–2008, Texas Instruments Incorporated
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