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參數資料
| 型號： | TPS2393APWRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封裝： | GREEN, PLASTIC, TSSOP-14 |
| 文件頁數： | 13/30頁 |
| 文件大小： | 665K |
| 代理商： | TPS2393APWRG4 |
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TPS2393A
SLUS610 JULY 2004
20
www.ti.com
APPLICATION INFORMATION
If the result of equation (4) is larger than the maximum input supply value, then the load can be expected to
charge completely during the inrush slewing portion of the insertion event. However, if this voltage is less than
the maximum supply input, VIN(max), the HSPM transitions to the constant-current charging of the load. The
remaining amount of time required at IMAX is determined from equation (5).
t
CC +
C
L
V
IN(max) * VLSS
V
REF_K(min)
R
SENSE
where:
D tCC is the constant-current voltage ramp time, in seconds
D VREF_K(min) is the minimum clamp voltage, 33 mV.
With this information, the minimum recommended value timing capacitor CFLT can be determined. The delay
time needed will be either a time tSS2 or the sum of tSS2 and tCC, according to the estimated time and profiles
of load charging. The quantity tSS2 is the duration of the normal rate current ramp period, and is given by
equation (6).
t
SS2 + 0.35
C
RAMP
where:
D CRAMP is given in microfarads, and tSS2 is in seconds
Since fault timing is generated by the constant-current charging of CFLT, the capacitor value is determined by
equation (7) or (8).
C
FLT(min) +
55
t
SS2
3.75
C
FLT(min) +
55
t
SS2 ) tCC
3.75
where:
D CFLT(min) is the recommended capacitor value, in microfarads
D tSS2 is the result of equation (6), in seconds
D tCC is the result of equation (5), in seconds
For the typical application example, with the 100-
F filter capacitor in front of the dc-to-dc converter, equations
(3) and (4) estimate the load voltage ramping to 46 V during the soft-start period. If the module should operate
down to 72-V input supply, approximately another 1.58 ms of constant-current charging may be required.
Therefore, equations (6) and (8) (because of the constant-current sourcing) are used to determine CFLT(min).
The result of 0.043
F suggests the 0.047-F standard value.
(5)
(6)
(7)
(8)
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