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參數資料
| 型號： | TPS2390DGK |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | GREEN, PLASTIC, MSOP-8 |
| 文件頁數： | 7/20頁 |
| 文件大小： | 497K |
| 代理商： | TPS2390DGK |
TPS2390
TPS2391
SLUS471D JUNE 2002 REVISED JANUARY 2008
15
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:
t
CC is the constant-current voltage ramp time, in seconds, and
V
REF_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 is either tSS or the sum of tSS and tCC, according to the estimated time to charge the load. Since
fault timing is generated by the constant-current charging of CFLT, the capacitor value is determined by equation
(6) or (7).
C
FLT
(MIN)
+
55
t
SS
3.75
C
FLT
(MIN)
+
55
t
SS )
t
CC
3.75
where:
C
FLT(min) is the recommended capacitor value, in microfarads,
t
SS is the result of equation (3), in seconds, and
t
CC 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, equation 7 is used to determine CFLT(min), and the result is approximately 0.1 F.
(5)
(6)
(7)
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