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| 型号： | TPS65001RUKT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.4 A SWITCHING REGULATOR, 2847 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, QFN-20 |
| 文件页数： | 13/34页 |
| 文件大小： | 0K |
| 代理商： | TPS65001RUKT |
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f
OUT
IN
RMSCout
OUT
V
1 -
V
1
I
= V
x
L x
2 x
3
f
OUT
IN
OUT
V
1 -
V
1
V
= V
x
+ ESR
L x
8 x C
x
D
÷
÷
÷
÷
è
SLVS810B – JUNE 2009 – REVISED AUGUST 2010
www.ti.com
Output Capacitor Selection
The advanced Fast Response voltage mode control scheme of the converter allows the use of small ceramic
capacitors with a typical value of 22mF, without having large output voltage under and overshoots during heavy
load transients. Ceramic capacitors having low ESR values result in lowest output voltage ripple, and therefore,
are recommended. See the recommended components.
If ceramic output capacitors are used, the capacitor RMS ripple current rating will always meet the application
requirements. The RMS ripple current is calculated as:
(8)
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:
(9)
Where the highest output voltage ripple occurs at the highest input voltage VIN.
At light load currents, the converter operates in Power Save Mode and the output voltage ripple is dependent on
the output capacitor value. The output voltage ripple is set by the internal comparator delay and the external
capacitor. The typical output voltage ripple is less than 1% of the nominal output voltage.
The adjustable output voltage of the DCDC converter is calculated by Equation 1 in the Step-Down Converter. To
keep the external resistor divider network robust against noise, an external feed forward capacitor is required for
optimum load transient response. The value of feed forward capacitor should be in the range between 22pF and
33pF provided the equivalent resistance of RDC1 || RDC2 in Equation 1 is approximately 300k
. Scale change
on RDC1||RDC2 would apply a scale change to the feed forward capacitor to keep the RC product a constant.
Input Capacitor Selection
Due to the nature of the DCDC converter, having a pulsating input current, a low ESR input capacitor is required
for best input voltage filtering, and minimizing the interference with other circuits caused by high input voltage
spikes. It is critical to put the input capacitor as close to the VINDCDC pin as close as possible with the clean
GND connection provided. The same consideration is applied for the output capacitor and the inductor. The
converters need a ceramic input capacitor of 10mF. The input capacitor can be increased without any limit for
better input voltage filtering.
Table 3. Capacitors
CAPACITANCE
SUPPLIER
TYPE
22mF
TDK C2012X5R0J226MT
Ceramic
22mF
Taiyo Yuden JMK212BJ226MG
Ceramic
10mF
Taiyo Yuden JMK212BJ106M
Ceramic
10mF
TDK C2012X5R0J106M
Ceramic
10mF
Murata GRM188R60J106M69D
Ceramic
20
Copyright 2009–2010, Texas Instruments Incorporated
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