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參數(shù)資料
| 型號： | TPS51220ARTVR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 333 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 5 X 5 MM, PLASTIC, QFN-32 |
| 文件頁數(shù)： | 14/53頁 |
| 文件大?。?/td> | 1380K |
| 代理商： | TPS51220ARTVR |
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200ms
960ms
Vout1
EN1
Vout1
External
Soft-start
time
EN1>1V
EN1<2V
1)Internal
Soft-start
2)External
Soft-start
www.ti.com
SLUS897D – DECEMBER 2008 – REVISED FEBRUARY 2010
DETAILED DESCRIPTION
ENABLE AND SOFT START
When EN is Low, the TPS51220A is in the shutdown state. Only the 3.3-V LDO stays alive, and consumes 7 mA
(typically). When EN becomes High, the TPS51220A is in the standby state. The 2-V reference and the 5-V LDO
become enabled, and consume about 80 mA with no load condition, and are ready to turn on SMPS channels.
Each SMPS channel is turned on when ENx becomes High. After ENx is set to high, the TPS51220A begins the
softstart sequence, and ramps up the output voltage from zero to the target voltage in 0.96 ms. However, if a
slower soft-start is required, an external capacitor can be tied from the ENx pin to GND. In this case, the
TPS51220A charges the external capacitor with the integrated 2-mA current source. An approximate external
soft-start time would be tEX-SS = CEX / IEN12, which means the time from ENx = 1 V to ENx = 2 V. The recommend
capacitance is more than 2.2 nF.
Figure 40. Enable and Soft-start Timing
Table 1. Enable Logic States
EN
EN1
EN2
VREG3
VREF2
VREG5
CH1
CH2
GND
Don’t Care
ON
Off
Hi
Lo
ON
Off
Hi
Lo
ON
Off
Hi
Lo
Hi
ON
Off
ON
Hi
ON
PRE-BIASED START-UP
The TPS51220A supports a pre-biased start up by preventing negative inductor current during soft-start when
the output capacitor holds some charge. The initial DRVH signal waits until the voltage feedback signal becomes
greater than the internal reference ramping up by the soft-start function. After that, the start-up occurs in the
same way the soft-start condition fully discharges, regardless of the SKIPSELx selection.
Copyright 2008–2010, Texas Instruments Incorporated
21
Product Folder Link(s) :TPS51220A
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