參數(shù)資料
型號： TPS40054QPWPRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： PLASTIC, HTSSOP-16
文件頁數(shù)： 6/28頁
文件大小： 571K
代理商： TPS40054QPWPRQ1
www.ti.com
UDG03034
DA
CA
47 pF
RA
499 kW
RKFF
71.5 kW
1
2
3
4
16
15
14
13
ILIM
VIN
BOOST
HDRV
KFF
RT
BP5
SYNC
5
6
7
8
12
11
10
9
SW
BP10
LDRV
PGND
SGND
SS
VFB
COMP
VIN
+
PWP
1N914, 1N4150
Type Signal Diode
E
C +
1
2
C
V2 (Joules)
(10)
V2 +
V
f
2
* Vi
2
Volts2
(11)
C
O +
L
I
OH
2
* IOL
2
V
f
2
* Vi
2
(Farads)
(12)
PROGRAMMING SOFT START
TPS40054-Q1, TPS40055-Q1, TPS40057-Q1
SLAS482A – AUGUST 2005 – REVISED NOVEMBER 2005
APPLICATION INFORMATION (continued)
Figure 9. Hysteresis for Programmable UVLO
Energy in the capacitor is described in Equation 10.
where:
V
f is the final peak capacitor voltage
V
I is the initial capacitor voltage
Substituting Equation 7 into Equation 6, then substituting Equation 11 into Equation 10, then setting Equation 10
equal to Equation 6, and then solving for CO yields the capacitance described in Equation 12.
TPS4005x uses a closed-loop approach to ensure a controlled ramp on the output during start-up. Soft-start is
programmed by charging an external capacitor CSS) via an internally generated current source. The voltage on
CSS minus 0.85 V is fed into a separate non-inverting input to the error amplifier (in addition to FB and 0.7-V
VREF). The loop is closed on the lower of the CSS– 0.85 V) voltage or the internal reference voltage (0.7-V
VREF). Once the CSS– 0.85 V) voltage rises above the internal reference voltage, regulation is based on the
internal reference. To ensure a controlled ramp-up of the output voltage the soft-start time should be greater than
the L-CO time constant as described in Equation 13.
14
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