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| 型号： | TPS2399DGKRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 6/27页 |
| 文件大小： | 792K |
| 代理商： | TPS2399DGKRG4 |
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TPS2398
TPS2399
SLUS562A JUNE 2003 REVISED SEPTEMBER 2003
14
www.ti.com
APPLICATION INFORMATION
Figure 20
INPUT TRANSIENT RESPONSE
CLOAD = 100 F
RLOAD = 50
RSNS = 20 m
CIRAMP = 3900 pF
IINB= (2 A/div)
48V_RTN (5 V/div)
(Offset 44 V)
t TIme 100
s/div
GATE (5 V/div)
VDRAIN (5 V/div)
PG (50 V/div)
In order for downstream loads (bricks, etc.) to operate through the distribution bus transient, it is important to
properly size the filtering capacitance to supply the needed energy during the OFF-time of the pass FET. In this
example, once the RTN node stabilizes at about 3.5 V higher than the original potential, about 4.5 V develops
across the FET, indicating approximately a 1-V droop across the brick input. Therefore, due to the fast response
of the TPS2398/99 devices, the 100-
F capacitor achieves excellent hold-up of the brick input voltage. Actual
requirements depend heavily on the individual application. Whether the device turns back on in either
current-ramp or current-limit mode depends in part on the size of the ramp capacitor (CIRAMP) and the input
capacitance of the pass FET. But in any case, the circuit turns back on in a controlled-current manner after
rapidly clamping the potentially damaging spike.
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