參數(shù)資料
型號(hào)： TPS40055QPWPRQ1
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： PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 17/28頁(yè)
文件大?。?/td> 571K
代理商： TPS40055QPWPRQ1
www.ti.com
T
J + PCOND ) PSW
q
JA ) TA + (0.129 ) 1.152)
40 ) 85 + 136OC
(55)
I
RMS + IO
1 * d + 8
1 * 0.135 + 7.44 ARMS
(56)
P
COND + IRMS
2
R
DS(on) + 7.44
2
0.008
(1 ) 0.007(150 * 25)) + 0.83 W
(57)
P
DC + 2
I
O
V
FD
t
DELAY
f
SW + 2
8.0 A
0.8 V
100 ns
300 kHz + 0.384 W
(58)
P
RR + 0.5
Q
RR
V
IN
f
SW + 0.5
30 nC
24 V
300 kHz + 0.108 W
(59)
P
SR + PRR ) PCOND ) PDC + 0.108 ) 0.83 ) 0.384 + 1.322 W
(60)
T
J + PSR
q
JA ) TA + (1.322)
40 ) 85 + 139
oC
(61)
L +
(24 * 3.3 V)
3.3 V
24 V
3.2 A
300 kHz
+ 2.96 mH
(62)
R
T +
1
f
SW
17.82
10*6
* 17 kW + 170 kW N use 169 kW
(63)
R
KFF + VIN(min) * 3.5
58.14
R
T ) 1340 kW + 72.5 kW
N use 71.5 kW
(64)
TPS40054-Q1, TPS40055-Q1, TPS40057-Q1
SLAS482A – AUGUST 2005 – REVISED NOVEMBER 2005
DESIGN EXAMPLE (continued)
The MOSFET junction temperature can be found by substituting Equation 35 into Equation 34
5. Calculate synchronous rectifier losses
The synchronous rectifier MOSFET has two 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 IRMS current through the synchronous rectifier from Equation 38
The synchronous MOSFET conduction loss from Equation 33 is:
The body diode conduction loss from Equation 39 is:
The body diode reverse recovery loss from Equation 40 is:
The total power dissipated in the synchronous rectifier MOSFET from Equation 41 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.
6. Calculate the inductor value
The inductor value is calculated from Equation 62.
A 2.9-H Coev DXM1306-2R9 or 2.6-H Panasonic ETQ-P6F2R9LFA 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 63, with fSW in kHz.
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 Equation 64.
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 Equation 65.
24
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