參數(shù)資料
型號(hào)： TPS40050PWPRG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： GREEN, PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 18/36頁(yè)
文件大小： 648K
代理商： TPS40050PWPRG4
TPS40050
TPS40051
TPS40053
SLUS540F DECEMBER 2002 REVISED JUNE 2004
www.ti.com
25
DESIGN EXAMPLE
6. Calculate the inductor value
The inductor value is calculated from equation (6).
L
+
(24
* 3.3 V)
3.3 V
24 V
3.2 A
300 kHz
+ 2.96 mH
A 2.9-
H Coev DXM13062R9 or 2.6-H Panasonic ETQP6F2R9LFA can be used.
7. Setting the switching frequency
The clock frequency is set with a resistor (RT) from the RT pin to ground. The value of RT can be found from
equation (1), with fSW in kHz.
R
T +
1
f
SW
17.82
10*6
* 23 kW + 164 kW N use 165 kW
8. Programming the ramp generator circuit
The PWM ramp is programmed through a resistor (RKFF) from the KFF pin to VIN. The ramp generator also
controls the input UVLO voltage. For an undervoltage level of 10 V, RKFF can be calculated from (2)
R
KFF + VIN(min) * 3.5
58.14
R
T ) 1340 kW + 71 kW
N use 71.5 kW
9. Calculating the output capacitance (CO)
In this example the output capacitance is determined by the load response requirement of
V = 0.3 V for a 1 A
to 8 A step load. CO can be calculated using (12)
C
O +
2.9
m
(8A)
2 * (1A)2
(3.3)
2 * (3.0)2
+ 97 mF
Using (7) we can calculate the ESR required to meet the output ripple requirements.
33 mV
+ 3.2 A ESR )
1
8
73
mF
300 kHz
ESR
+ 10.3 mW * 3.33 mW + 6.97 mW
For this design example two (2) Panasonic SP EEFUEOJ1B1R capacitors, (6.3 V, 180
F, 12 m) are used.
10. Calculate the soft-start capacitor (CSS)
This design requires a softstart time (tSTART) of 1 ms. CSS can be calculated on (14)
C
SS +
2.3
mA
0.7 V
1ms
+ 3.29 nF + 3300 pF
(61)
(62)
(63)
(64)
(65)
(66)
(67)
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