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参数资料
| 型号： | TPS70758PWPR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20 |
| 封装： | GREEN, PLASTIC, HTSSOP-20 |
| 文件页数： | 17/38页 |
| 文件大小： | 626K |
| 代理商： | TPS70758PWPR |
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VOUT2
VIN1
VIN2
EN
SEQ
VOUT1
VSENSE1
PG1
MR2
RESET
MR1
VSENSE2
VOUT2
VI
VOUT1
MR1
0.1 mF
RESET
10 mF
0.1 mF
MR2
EN
2 V
0.7 V
TPS707xxPWP
(FixedOutputOption)
>2 V
<0.7 V
250 kW
83%
95%
120ms
EN
VOUT2
VOUT1
PG1
MR1
MR2
(MR2 tied to PG1)
RESET
SEQ
120ms
83%
95%
NOTE A: t1 Time at which both VOUT1 and VOUT2 are greater than the PG1 thresholds and MR1 is logic high.
t1
(see Note A)
TPS70745, TPS70748
TPS70751, TPS70758
TPS70702
SLVS291D – MAY 2000 – REVISED DECEMBER 2007
Application condition: VIN1 and VIN2 are tied to the
same fixed input voltage greater than the VUVLO; SEQ
is tied to logic high; PG1 is tied to MR2; MR1 is
initially at logic high but is eventually toggled.
EN is initially high; therefore, both regulators are off
and PG1 and RESET are at logic low. With SEQ at
logic high, when EN is taken low, VOUT2 turns on.
VOUT1 turns on after VOUT2 reaches 83% of its
regulated output voltage. When VOUT1 reaches 95%
of its regulated output voltage, PG1 (tied to MR2)
goes to logic high. When both VOUT1 and VOUT2 reach
95% of their respective regulated output voltages and
both MR1 and MR2 (tied to PG1) are at logic high,
RESET is pulled to logic high after a 120ms delay.
When MR1 is taken low, RESET returns to logic low
but the outputs remain in regulation. When MR1 is
returned to logic high, since both VOUT1 and VOUT2
remain above 95% of their respective regulated
output voltages and MR2 (tied to PG1) remains at
logic high, RESET is pulled to logic high after a
120ms delay.
Figure 38. Timing when MR1 is Toggled
24
Copyright 2000–2007, Texas Instruments Incorporated
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