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| 型号： | TPS65055RSMR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A DUAL SWITCHING CONTROLLER, 2475 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 11/41页 |
| 文件大小： | 1276K |
| 代理商： | TPS65055RSMR |
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PFMMode
lightload
Smooth
increasedload
PFMMode
lightload
COMP_LOWthreshold
+1%
VOUT_NOM
PWMMode
Medium/HeavyLoad
PWMMode
Medium/HeavyLoad
FastLoadTransient
Soft Start
95%
5%
t
RAMP
t
Start
EN
V
OUT
100% Duty Cycle Low Dropout Operation
(
)
min
max
L
Vin
= Vout
+ Iout
RDSon
+ R
www.ti.com.......................................................................................................................................................................................... SLVS844 – SEPTEMBER 2008
The two converters have an internal soft start circuit that limits the inrush current during start-up. During soft
start, the output voltage ramp up is controlled as shown in Figure 20.
Figure 20. Soft Start
The converters offer a low input to output voltage difference while still maintaining operation with the use of the
100% duty cycle mode. In this mode the P-channel switch is constantly turned on. This is particularly useful in
battery-powered applications to achieve the longest operation time by taking full advantage of the whole battery
voltage range, for example. The minimum input voltage to maintain regulation depends on the load current and
output voltage and can be calculated as:
With:
Ioutmax = maximum output current plus inductor ripple current
RDSonmax = maximum P-channel switch RDSon.
RL = DC resistance of the inductor
Voutmax = nominal output voltage plus maximum output voltage tolerance
With decreasing load current, the device automatically switches into pulse skipping operation in which the power
stage operates intermittently based on load demand. By running cycles periodically the switching losses are
minimized and the device runs with a minimum quiescent current maintaining high efficiency.
In power save mode the converter only operates when the output voltage trips below its nominal output voltage.
It ramps up the output voltage with several pulses and goes again into power save mode once the output voltage
exceeds the nominal output voltage.
Copyright 2008, Texas Instruments Incorporated
19
Product Folder Link(s): TPS65055
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