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参数资料
| 型号： | TPS2394PWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封装： | PLASTIC, TSSOP-14 |
| 文件页数： | 4/18页 |
| 文件大小： | 356K |
| 代理商： | TPS2394PWR |
SS
RAMP
t
= 1260
C
(
)
2
AVG
LSS
SS
LOAD
RAMP
SENSE
i
V
=
t
2 × C
× C
× 100 × R
(
)
-
LOAD
IN(MAX)
LSS
CC
REF_K(MIN)
SENSE
C
V
t
=
V
R
SS2
RAMP
t
= 0.35
C
SS2
FLT(MIN)
54
t
C
=
3.75
(
)
SS2
CC
FLT(MIN)
54
t
C
=
3.75
+
SLVSAA9 – AUGUST 2010
www.ti.com
Due to the three-phase nature of the load current at turn-on, the load voltage ramp has potentially three distinct
phases. This profile depends on the relative values of load capacitance, input DC potential, maximum current
limit and other factors. The first two phases are characterized by the two different slopes of the current ramp; the
third phase, if required to complete load charging, is the constant-current charging at IMAX. Considering the two
current ramp phases to be one period at an average di/dt simplifies calculation of the required timing capacitor.
(3)
Where:
tSS is the soft-start period in ms
CRAMP is given in F
During this current ramp period, the load voltage magnitude which is attained is estimated by Equation 4.
(4)
Where:
VLSS is the load voltage reached during soft-start
iAVG is 3.18 A for the TPS2394
CLOAD is the load capacitance in Farads
tSS is the soft-start period in s
The quantity iAVG in Equation 4 is a weighted average of the two charge currents applied to CRAMP during turn-on,
considering the typical output values.
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
(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
12
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS2394
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