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參數資料
| 型號： | TPS40055QPWPRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-16 |
| 文件頁數： | 16/28頁 |
| 文件大小： | 571K |
| 代理商： | TPS40055QPWPRQ1 |
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DESIGN EXAMPLE
d
MIN +
V
O(min)
V
IN(max)
+
3.324
24
+ 0.135
d
MAX +
V
O(max)
V
IN(min)
+
3.366
10
+ 0.337
(46)
V
O(min)
V
IN(max)
+
t
ON
T
SW
or
(47)
1
T
SW
+ fSW +
V
O(min)
V
IN(max)
T
ON
(48)
f
SW +
0.135
400 ns
+ 337 kHz
(49)
f
SW + 0.9
337 kHz + 303 kHz
(50)
DI + IO
2
0.2 + 8
2
0.2 + 3.2 A
(51)
I
RMS + IO
d + 8
0.135 + 2.93 A
(52)
P
COND + 2.93
2
0.008
(1 ) 0.007
(150 * 25)) + 0.129 W
(53)
P
SW(fsw) + VIN
I
O
t
SW
f
SW + 24 V
8 A
20 ns
300 kHz + 1.152 W
(54)
TPS40054-Q1, TPS40055-Q1, TPS40057-Q1
SLAS482A – AUGUST 2005 – REVISED NOVEMBER 2005
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 mVP-P 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
fSW = 300 kHz
1. Calculate maximum and minimum duty cycles
2. Select switching frequency
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 the Electrical Characteristics table). Therefore,
Using 400 ns to provide margin,
Since the oscillator can vary by 10%, decrease fSW by 10%
and therefore choose a frequency of 300 kHz.
3. Select
I
In this case,
I is chosen so that the converter enters discontinuous mode at 20% of nominal load.
4. Calculate the power losses
Power losses in the high-side MOSFET (Si7860DP) at 24-VIN where switching losses dominate can be calculated
from Equation 52.
substituting Equation 34 into Equation 33 yields
and from Equation 33, the switching losses can be determined.
23
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