參數(shù)資料
型號(hào)： TPS2350PWG4
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(shù)： 7/26頁
文件大?。?/td> 596K
代理商： TPS2350PWG4
(
)
LOAD
IN(MAX)
REF_K(MIN)
SENSE
C
V
-V
LSS
t
=
CC
V
R
RAMP
SS2
t
= 0.35 C
SS2
=
FLT(MIN)
54
C
3.75
t
(
)
=
FLT(MIN)
54
C
3.75
+
tSS2 tCC
SLUS574C
– JULY 2003 – REVISED MARCH 2011
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.
(5)
where
tCC is the constant-current voltage ramp time, in seconds
VREF_K(MIN) is the minimum clamp voltage, 34 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.
(6)
where
CRAMP is given in F
Since fault timing is generated by the constant-current charging of CFLT, the capacitor value is determined from
either Equation 7 or Equation 8, as appropriate.
(7)
(8)
where
CFLT(MIN) is the recommended capacitor value, in -Farads
tSS2 is the result of Equation 6, in seconds
tCC is the result of Equation 5, in seconds
Continuing this calculation example, using a 220-
F input capacitor (CLOAD), Equation 3 and Equation 4 estimate
the load voltage ramping to approximately
–45 V during the soft-start period. If the module should operate down
to
–72-V input supply, approximately another 1.4 ms of constant-current charging may be required. Therefore,
Equation 6 and Equation 8 are used to determine CFLT(MIN), and the result is approximately 0.039-F.
Copyright
2003–2011, Texas Instruments Incorporated
15
Product Folder Link(s): TPS2350
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