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| 型号： | TPS40060PWPG4 |
| 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, HTSOOP-16 |
| 文件页数： | 15/33页 |
| 文件大小： | 750K |
| 代理商： | TPS40060PWPG4 |
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P
SW(fsw) + VIN
I
O
t
SW
f
SW + 55 V
5 A
20 ns
130 kHz + 0.715 W
(49)
T
J + PCOND ) PSW
qJA ) TA + (0.324 ) 0.715)
40 ) 85 + 127OC
(50)
5. Calculate synchronous rectifier losses
I
RMS + IO
1 * d + 5
1 * 0.0588 + 4.85 ARMS
(51)
P
COND + IRMS
2
R
DS(on) + 4.85
2
0.011
(1 ) 0.007(150 * 25)) + 0.10 W
(52)
P
DC + 2
I
O
V
FD
t
DELAY
f
SW + 2
5.0 A
0.8 V
100 ns
130 kHz + 0.104 W
(53)
P
RR + 0.5
Q
RR
V
IN
f
SW + 0.5
30 nC
55 V
130 kHz + 0.107 W
(54)
P
SR + PRR ) PCOND ) PDC + 0.107 ) 0.1 ) 0.104 + 0.311 W
(55)
T
J + PSR
qJA ) TA + (0.311)
40 ) 85 + 97
oC
(56)
6. Calculate the Inductor Value
L +
(48 * 3.3)
3.3
48
2.0
130 kHz +
11.8 mH
(57)
7. Setting the switching frequency
R
T +
1
f
SW
17.82 E * 06
* 23 kW + 408 kW, use 412 kW
(58)
8. Programming the Ramp Generator Circuit
SLUS543E – DECEMBER 2002 – REVISED JUNE 2006
DESIGN EXAMPLE (continued)
The MOSFET junction temperature can be found by substituting Equation 33 into Equation 32
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 29 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 11
A standard inductor value of 10-H is chosen. A Coev DXM1306-10RO or Panasonic ETQPF102HFA could be
used.
The clock frequency is set with a resistor (RT) from the RT pin to ground. The value of RT can be derived 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 14.4V (20% below the 18 VIN(min), RKFF is
calculated in Equation 59.
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40060PWPR | 功能描述:DC/DC 开关控制器 Wide Input Freq Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40060PWPRG4 | 功能描述:DC/DC 开关控制器 Wide Input Freq Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40061 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40061PWP | 功能描述:DC/DC 开关控制器 Wide Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40061PWP | 制造商:Texas Instruments 功能描述:IC 制造商:Texas Instruments 功能描述:IC, SYNC BUCK DC/DC CONTROLLER, 16-HTSSOP |
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