參數(shù)資料
型號(hào)： TPS40055PWP
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： GREEN, PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 15/35頁(yè)
文件大?。?/td> 866K
代理商： TPS40055PWP
DESIGN EXAMPLE
1. Calculate maximum and minimum duty cycles
(
)
(
)
(
)
(
)
O min
O max
MIN
MAX
IN max
IN min
V
3.234
3.366
D
0.135
D
0.337
V
24
V
10
=
(44)
2. Select switching frequency
V
O(min)
V
IN(max)
+
t
ON
T
SW
or
(45)
1
T
SW
+ fSW +
V
O(min)
V
IN(max)
T
ON
(46)
f
SW +
0.135
400 ns +
337 kHz
(47)
3. Select
ΔI
DI + IO
2
0.2 + 8
2
0.2 + 3.2 A
(48)
4. Calculate the power losses
I
RMS + IO
d + 8
0.135 + 2.93 A
(49)
P
COND + 2.93
2
0.008
(1 ) 0.007
(150 * 25)) + 0.129 W
(50)
SLUS593F – DECEMBER 2003 – REVISED SEPTEMBER 2008 ...................................................................................................................................... www.ti.com
Input voltage: 10 Vdc to 24 Vdc
Output voltage: 3.3 V ±2% (3.234 ≤ V
O ≤ 3.366)
Output current: 8 A (maximum, steady state), 10 A (surge, 10 ms duration, 10% duty cycle maximum)
Output ripple: 33 mV
PP at 8 A
Output load response: 0.3 V ≥ 10% to 90% step load change, from 1 A to 7 A
Operating temperature: -40°C to 85°C
f
SW = 300 kHz
The switching frequency is based on the minimum duty cycle ratio and the propagation delay of the current limit
comparator. In order to maintain current limit capability, the on time of the upper MOSFET, tON, must be greater
than 300 ns (see Electrical Characteristics Table ). Therefore:
Using 400 ns to provide margin,
Since the oscillator can vary by 10%, decrease fSW, by 10%
fSW = 0.9 ×337 kHz = 303 kHz
and therefore choose a frequency of 300 kHz.
In this case
ΔI is chosen so that the converter enters discontinuous mode at 20% of nominal load.
Power losses in the high-side MOSFET (Si7860DP) at 24-VIN where switching losses dominate can be calculated
Substituting Equation 31 into Equation 30 yields
and from Equation 32, the switching losses can be determined.
22
Copyright 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS40054 TPS40055 TPS40057
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