參數(shù)資料
型號: TPS40180RGERG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: 0.05 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24
封裝: GREEN, PLASTIC, VQFN-24
文件頁數(shù): 9/52頁
文件大?。?/td> 1291K
代理商: TPS40180RGERG4
www.ti.com
SS
PREBIAS
BAIS
SS1
BIAS
C
V
R
t1
I
R1 R
=
÷
+
è
(3)
SS
PREBIAS
BIAS
REF
SS2
BIAS
C
V
R
t2
V
I
R1 R
=
-
÷
÷
÷
+
è
è
(4)
=
+
SS
T
t1 t2
(5)
Tracking
R1
R2
1
7
C2
V
EXT
+
-
I
SS
FB
DIFFO
24 COMP
SS
2
C4
C1
C5
R6
R3
R4
C3
R5
TPS40180
UDG-07027
SLVS753B – FEBRUARY 2007 – REVISED NOVEMBER 2007
where
t
1 is the time to the first PWM pulse in seconds
t
2 is the time from the first PWM pulse until regulation in seconds
C
(SS) is the SS pin capacitor in F
I
(SS1) is the SS1 pin charging current in A, 7.5 A
I
(SS2)is the SS2 pin charging current in A,15 A
T
SS is the total soft-start time
The TPS40180 can function in a tracking mode, where the output tracks some other voltage. To do this, a
voltage divider is connected from the voltage to be tracked to GND, with the tap of the divider connected to the
SS pin of the TPS40180. See Figure 24. The capacitors C1 and C2 are required for two purposes. First they
provide a means for timing of overcurrent restart attempts. Second, they provide for matching output voltage
ramp up rate of the TPS40180 to the controlling external supply.
Figure 24. Tracking Setup
Copyright 2007, Texas Instruments Incorporated
17
Product Folder Link(s): TPS40180
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