參數(shù)資料
型號(hào)： TPS53127RGET
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PQCC24
封裝： GREEN, PLASTIC, VQFN-24
文件頁(yè)數(shù)： 13/29頁(yè)
文件大小： 861K
代理商： TPS53127RGET
V
= (V - V
)
swinj
IN
O
1
0.5875
1
f
SW
V
O
1
V
IN
10127
( ) ( )
R1 =
(
V
O
V
FB +
V
FB(RIPPLE)
2
- 1
)R2
1
+ Vswinj
V
=
TRIP
(V-V )
IN
O
2
1
L
f
SW
V
O
V
IN
R
DS(ON)
(I -
OCL
)
R
(k )=
TRIP
W
V
(mV)-V
TRIP
OCLoff
I
( A)
TRIP(min)
m
C=
SS
T
I
SS
SSC
V
FB
SLVSA93 – MARCH 2010
www.ti.com
4. Choose bootstrap capacitor.
The TPS53127 requires a bootstrap capacitor from SW to VBST to provide the floating supply for the
high-side drivers. A minimum 0.1-mF high-quality ceramic capacitor is recommended. The voltage rating
should be greater than 10 V.
5. Choose VREG5 and V5FILT capacitor.
The TPS53127 requires both the VREG5 regulator and V5FILT input are bypassed. A minimum 4.7-mF
high-quality ceramic capacitor must be connected between the VREG5 and GND for proper operation. A
minimum 1-mF high-quality ceramic capacitor must be connected between the V5FILT and GND for proper
operation. Both of these capacitors’ voltage ratings should be greater than 10 V.
6. Choose output voltage divider resistors.
The output voltage is set with a resistor divider from the output voltage node to the VFBx pin. It is
recommended to use 1% tolerance or better resisters. Select R2 between 10 k
and 100 k and use
Equation 11 or Equation 12 to calculate R1.
(11)
(12)
Where
VFB(RIPPLE) = Ripple voltage at VFB
Vswinj = Ripple voltage at error comparator
7. Choose register setting for over current limit.
(13)
(14)
Where
RDS(ON) = Low side FET on-resistance
ITRIP(min) = TRIP pin source current （8.5 mA）
VOCL0ff = Minimum over current limit offset voltage (–20 mV)
IOCL = Over current limit
8. Choose soft start capacitor.
Soft start time equation is as follows.
(15)
20
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS53127
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