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參數(shù)資料
| 型號： | TPS2346PWTR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數(shù)： | 11/30頁 |
| 文件大小： | 490K |
| 代理商： | TPS2346PWTR |
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TPS2346
SLUS529 – MAY 2002
19
www.ti.com
APPLICATION INFORMATION
UDG–02006
t0:
ENABLE input brought low to initiate a turn-on sequence.
t1:
Channel 1 (5.15V) gate enabled; IRAMP capacitor starts charging with slow turn-on clamp.
Slow charging of load voltage (back-end 5.15V) begins.
t2:
Slow turn-on period ends; linear ramp of current to the load begins.
t3:
Constant di/dt period ends; load voltage ramping continues at IMAX rate.
t4:
Back–End 5.15 V reaches input DC potential.
t5:
Channel 2 (5V) gate is enabled. Slow charging of load voltage (back-end 5V) begins. Fault monitoring on Ch. 1 enabled.
t6:
Slow turn-on period ends; linear ramp of current to load begins.
t7:
Constant di/dt period ends. Load voltage ramping continues at IMAX rate.
t8:
Back–End 5V reaches input DC potential.
t9:
Channel 3 (3.3V) gate is enabled. Slow charging of load voltage (back-end 3.3V) begins. Fault monitoring on Ch. 2 enabled.
t10: Slow turn–on period ends; linear ramp of current to the load begins.
t11: Constant di/dt period ends. Load voltage ramping continues at IMAX rate.
t12: Back–End 3.3V reaches input DC potential.
t13: Channel 4 (–5.2V) gate is enabled. Slow charging of load voltage (back-end –5.2V) begins. Fault monitoring on Ch. 3 enabled.
t14: Slow turn-on period ends; linear ramp of current to load begins.
t15: Constant di/dt period ends; load voltage ramping continues at IMAX rate.
t16: Back-end –5.2 V reaches input DC potential.
t17: Channel 4 UV/OV fault enable pulse.
t18: PG output pulled low.
VO(IRAMP)
BACK-END
5.15-V
BACK-END
5-V
BACK-END
3.3-V
BACK-END
–5.2-V
t0 t1 t2
t3
t4
t5 t6
t7
t8
t9 t10
t11
t12
t13 t14
t15
t16
t17 t18
0 V
PG
–5.2 V
0 V
3.3 V
0 V
5 V
0 V
5.15 V
0 V
1.35 V
1.5 V
ENABLE
Figure 19. TPS2346 Ramp-Up Sequence
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