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參數資料
| 型號： | TPS650531IRGERQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC24 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, VQFN-24 |
| 文件頁數： | 10/26頁 |
| 文件大小： | 686K |
| 代理商： | TPS650531IRGERQ1 |
I
RMSCout + Vout
1 *
Vout
Vin
L
1
2
3
DVout + Vout
1 *
Vout
Vin
L
1
8
Cout
)
ESR
V
OUT + VREF
1 )
R5
R6
V
OUT + VFB_LDOx
R5 ) R6
R6
R5 + R6
V
OUT
V
FB_LDOx
* R6
SLVSAW1
– JUNE 2011
Output Capacitor Selection
The advanced Fast Response voltage mode control scheme of the two converters allow the use of small ceramic
capacitors with a typical value of 10
μF, 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 are
therefore recommended. See the recommended components in Table 4.
If ceramic output capacitors are used, the capacitor RMS ripple current rating will always meet the application
requirements. Just for completeness, the RMS ripple current is calculated as:
(7)
At nominal load current, the inductive converters operate 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:
(8)
Where the highest output voltage ripple occurs at the highest input voltage Vin.
At light load currents, the converters operate 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.
Input Capacitor Selection
Because of the nature of the buck 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. The converters need a ceramic input capacitor of 10
μF. The input capacitor can be increased
without any limit for better input voltage filtering.
Table 3. Possible Capacitors For DCDC Converters And LDOs
Capacitor Value
Size
Supplier
Type
2.2
μF
0805
TDK C2012X5R0J226MT
Ceramic
2.2
μF
0805
Taiyo Yuden JMK212BJ226MG
Ceramic
10
μF
0805
Taiyo Yuden JMK212BJ106M
Ceramic
10
μF
0805
TDK C2012X5R0J106M
Ceramic
Low Drop Out Voltage Regulators (LDOs)
The output voltage of LDO1 and LDO2 can be set by an external resistor network and can be calculated to:
(9)
with an internal reference voltage, VREF, typical 1 V.
It is recommended to set the total resistance of R5 + R6 to less than 1M
. Typically, there is no feedforward
capacitor needed at the voltage dividers for the LDOs.
(10)
18
Copyright
2011, Texas Instruments Incorporated
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