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參數資料
| 型號： | TPS65058RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.8 A DUAL SWITCHING CONTROLLER, 2475 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, VQFN-32 |
| 文件頁數： | 6/26頁 |
| 文件大小： | 1898K |
| 代理商： | TPS65058RGET |
Dynamic Voltage Positioning
+1%
-1%
PWMMode
medium/heavyload
PFMMode
lightload
Smooth
increasedload
PWMMode
medium/heavyload
PFMMode
lightload
Fastloadtransient
COMP_LOWthreshold
VOUT_NOM
Soft Start
V
OUT
EN
95%
5%
t
Start
t
RAMP
SLVS851A – MAY 2008 – REVISED SEPTEMBER 2008................................................................................................................................................... www.ti.com
This feature reduces the voltage under/overshoots at load steps from light to heavy load and vice versa. It is
activated in Power Save Mode operation when the converter runs in PFM Mode. It provides more headroom for
both the voltage drop at a load step increase and the voltage increase at a load throw-off. This improves load
transient behavior.
At light loads, in which the converters operate in PFM Mode, the output voltage is regulated typically 1% higher
than the nominal value. In case of a load transient from light load to heavy load, the output voltage will drop until
it reaches the skip comparator low threshold set to –1% below the nominal value and enters PWM mode. During
a load throw off from heavy load to light load, the voltage overshoot is also minimized due to active regulation
turning on the N-channel switch.
Figure 17. Dynamic Voltage Positioning
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 18.
Figure 18. Soft Start
14
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s) :TPS65058
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