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| 型号： | TPS40052PWP |
| 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： | 11/33页 |
| 文件大小： | 753K |
| 代理商： | TPS40052PWP |
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TPS40052
SLUS563C AUGUST 2003 REVISED FEBRUARY 2005
19
www.ti.com
APPLICATION INFORMATION
The 2-multiplier is used because the body-diode conducts twice each cycle (once on the rising edge and once
on the falling edge). The reverse recovery losses are due to the time it takes for the body diode to recovery from
a forward bias to a reverse blocking state. The reverse recovery losses are described in equation (34).
P
RR + 0.5
Q
RR
V
IN
f
SW
(Watts)
where:
D QRR is the reverse recovery charge of the body diode
The total synchronous rectifier MOSFET power dissipation is described in equation (35).
P
SR + PDC ) PRR ) PCOND
(Watts)
TPS40052 POWER DISSIPATION
The power dissipation in the TPS40052 is largely dependent on the MOSFET driver currents and the input
voltage. The driver current is proportional to the total gate charge, Qg, of the external MOSFETs. Driver power
(neglecting external gate resistance, refer to [2] can be calculated from equation (36).
P
D + Qg
V
DR
f
SW
(Watts)
And the total power dissipation in the TPS40052, assuming the same MOSFET is selected for both the high-side
and synchronous rectifier is described in equation (37).
P
T +
2
P
D
V
DR
) I
Q
V
IN
(Watts)
or
P
T + 2
Qg
f
SW ) IQ
V
IN
(Watts)
where:
D IQ is the quiescent operating current (neglecting drivers)
The maximum power capability of the device’s PowerPad package is dependent on the layout as well as air flow.
The thermal impedance from junction to air, assuming 2 oz. copper trace and thermal pad with solder and no
air flow.
θJA = 36.51°C/W
The maximum allowable package power dissipation is related to ambient temperature by equation (30).
Substituting equation (38) into equation (37) and solving for fSW yields the maximum operating frequency for
the TPS4005x. The result is described in equation (39).
f
SW +
T
J*TA
q
JA
V
DD
* I
Q
2
Qg
(Hz)
(34)
(35)
(36)
(37)
(38)
(39)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40052PWPG4 | 功能描述:DC/DC 开关控制器 Wide Input Sync Buck Cntrlr w/DDR trking 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 |
| TPS40052PWPR | 功能描述:DC/DC 开关控制器 Wide Input Sync Buck Cntrlr w/DDR trking 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 |
| TPS40052PWPRG4 | 功能描述:DC/DC 开关控制器 Wide Input Sync Buck Cntrlr w/DDR trking 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 |
| TPS40053 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40053PWP | 功能描述:DC/DC 开关控制器 Wide Input Vltg 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 |
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