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參數資料
| 型號： | TPS65011RGZ |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | POWER AND BATTERY MANAGEMENT IC FOR Li-ION POWERED SYSTEMS |
| 中文描述： | 電源和電池管理集成電路鋰離子供電系統 |
| 文件頁數： | 50/52頁 |
| 文件大?。?/td> | 1017K |
| 代理商： | TPS65011RGZ |
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www.ti.com
Output Capacitor Selection
The advanced fast response voltage mode control scheme of the inductive converters implemented in the
TPS65011 allow the use of small ceramic capacitors with a typical value of 22 μF for the main converter and 10
μF for the core converter without having large output voltage under and overshoots during heavy load transients.
Ceramic capacitors having low ESR values have the lowest output voltage ripple and are recommended. If
required tantalum capacitors with an ESR < 100
R may be used as well.
Refer to Table 5 for recommended components.
IRMSC(out)
VO
1–
VO
VI
L
1
2
3
(5)
VO
VO
1–
VO
VI
L
1
8
CO
ESR
(6)
Input Capacitor Selection
A pulsating input current is the nature of the buck converter. Therefore, a low ESR input capacitor is required for
best input voltage filtering. It also minimizes the interference with other circuits caused by high input voltage
spikes. The main converter needs a 22-μF ceramic input capacitor and the core converter a 10-μF ceramic
capacitor. The input capacitor for the main and the core converter can be combined and one 22-μF capacitor can
be used instead, because the two converters operate with a phase shift of 270 degrees. The input capacitor can
be increased without any limit for better input voltage filtering. The VCC pin should be separated from the input
for the main and the core converter. A filter resistor of up to 100
and a 1-μF capacitor is used for decoupling
the VCC pin from switching noise.
LDO1
Output Voltage Adjustment
The output voltage of LDO1 is set with a resistor divider at the feedback pin. The sum of the two resistors must
not exceed 1 MR to minimize voltage changes due to leakage current into the feedback pin. The output voltage
for LDO1 after start up is the voltage set by the external resistor divider. It can be reprogrammed with the I
2
C
interface to the three other values defined in the register VREGS1.
TPS65011
SLVS501–FEBRUARY 2004
If ceramic output capacitors are used, the capacitor RMS ripple current rating always meet the application
requirements. Just for completeness the RMS ripple current is calculated as:
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:
Where the highest output voltage ripple occurs at the highest input voltage V
I
.
At light load currents, the converters operate in power save mode and the output voltage ripple is independent of
the output capacitor value. The output voltage ripple is set by the internal comparator thresholds. The typical
output voltage ripple is 1% of the nominal output voltage. If the output voltage for the core converter is
programmed to its lowest voltage of 0.85 V, the output capacitor must be increased to 22 μF for low output
voltage ripple. This is because the current in the inductor decreases slowly during the off-time and further
increases the output voltage even when the PMOS is off. This effect increases with low output voltages.
Table 5. Possible Capacitors
CAPACITOR VALUE
22 μF
22 μF
22 μF
CASE SIZE
1206
1206
1210
COMPONENT SUPPLIER
TDK C3216X5R0J226M
Taiyo Yuden JMK316BJ226ML
Taiyo Yuden JMK325BJ226MM
COMMENTS
Ceramic
Ceramic
Ceramic
50
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS65011RGZR | 功能描述:電池管理 Multi-Channel 1-cell Li-Ion RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65011RGZR | 制造商:Texas Instruments 功能描述:Power Management IC |
| TPS65011RGZRG4 | 功能描述:電池管理 Multi-Channel 1-cell Li-Ion RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65012RGZR | 功能描述:電池管理 Multi-Channel 1-cell Li-Ion RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65012RGZRG4 | 功能描述:電池管理 Multi-Channel 1-cell Li-Ion RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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