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| 型号： | TPS40054PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 16/35页 |
| 文件大小： | 866K |
| 代理商： | TPS40054PWPRG4 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页
P
SW(fsw) + VIN
I
O
t
SW
f
SW + 24 V
8 A
20 ns
300 kHz + 1.152 W
(51)
T
J + PCOND ) PSW
qJA ) TA + (0.129 ) 1.152)
40 ) 85 + 136OC
(52)
5. Calculate synchronous rectifier losses
I
RMS + IO
1 * d + 8
1 * 0.135 + 7.44 ARMS
(53)
P
COND + IRMS
2
R
DS(on) + 7.44
2
0.008
(1 ) 0.007(150 * 25)) + 0.83 W
(54)
P
DC + 2
I
O
V
FD
t
DELAY
f
SW + 2
8.0 A
0.8 V
100 ns
300 kHz + 0.384
(55)
P
RR + 0.5
Q
RR
V
IN
f
SW + 0.5
30 nC
24 V
300 kHz + 0.108 W
(56)
P
SR + PRR ) PCOND ) PDC + 0.108 ) 0.83 ) 0.384 + 1.322 W
(57)
T
J + PSR
qJA ) TA + (1.322)
40 ) 85 + 139
oC
(58)
6. Calculate the inductor value
L +
(24 * 3.3 V)
3.3 V
24 V
3.2 A
300 kHz +
2.96 mH
(59)
7. Setting the switching frequency
R
T +
1
f
SW
17.82
10*6
* 17 kW + 170 kW N use 169 kW
(60)
8. Programming the ramp generator circuit
www.ti.com ...................................................................................................................................... SLUS593F – DECEMBER 2003 – REVISED SEPTEMBER 2008
The MOSFET junction temperature can be found by substituting Equation 40 into Equation 33:
The synchronous rectifier MOSFET has two (2) loss components, conduction, and diode reverse recovery
losses. The conduction losses are due to IRMS losses as well as body diode conduction losses during the dead
time associated with the anti-cross conduction delay.
The synchronous MOSFET conduction loss from Equation 30 is:
The body diode conduction loss from Equation 35 is:
The body diode reverse recovery loss from Equation 36 is:
The total power dissipated in the synchronous rectifier MOSFET from Equation 37 is:
The junction temperature of the synchronous rectifier at 85°C is:
In typical applications, paralleling the synchronous rectifier MOSFET with a Schottky rectifier increases the
overall converter efficiency by approximately 2% due to the lower power dissipation during the body diode
conduction and reverse recovery periods.
The inductor value is calculated from Equation 5.
A 2.9-H Coev DXM1306-2R9 or 2.6-H Panasonic ETQ-P6F2R9LFA can be used.
The clock frequency is set with a resistor (RT) from the RT pin to ground. The value of RT can be found from
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 Equation 2:
Copyright 2003–2008, Texas Instruments Incorporated
23
Product Folder Link(s): TPS40054 TPS40055 TPS40057
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