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| 型号： | TPS2398DGKG4 |
| 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： | 9/27页 |
| 文件大小： | 792K |
| 代理商： | TPS2398DGKG4 |
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TPS2398
TPS2399
SLUS562A JUNE 2003 REVISED SEPTEMBER 2003
17
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
LOAD
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 will be either a time tSS2 or the sum of tSS2 and tCC, according to the estimated time to charge the
load. 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:
C
RAMP is given in microfarads
Since fault timing is generated by the constantcurrent charging of CFLT, the capacitor value is determined from
either equation (7) or (8), as appropriate.
C
FLT(min) +
55
t
SS2
3.75
C
FLT(min) +
55
t
SS2 )
t
CC
3.75
where:
C
FLT(min) is the recommended capacitor value, in microfarads,
t
SS2 is the result of equation (6), in seconds, and
t
CC is the result of equation (5), in seconds.
Continuing the typical application example, using a 100-
F input capacitor (CLOAD), equations (3) and (4)
estimate the load voltage ramping to approximately 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) are used to determine CFLT(min), and the result of 0.043-F suggests
the 0.047-
F standard value.
(5)
(6)
(7)
(8)
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