参数资料
| 型号： | TPS54160ADRCR |
| 厂商： | Texas Instruments |
| 文件页数： | 34/55页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.5A 10SON |
| 标准包装： | 3,000 |
| 系列： | SWIFT™, Eco-Mode™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 58 V |
| 输入电压： | 3.5 V ~ 60 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz ~ 2.5MHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-SON 裸露焊盘（3x3） |
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SLVSB56C – MAY 2012 – REVISED FEBRUARY 2014
′
I RIPPLE
è
?
C OUT >
R ESR =
1 1
8 ′ f SW ? V OUT ( ripple ) ?
? ÷
? ÷
V OUT ( ripple )
I RIPPLE
(34)
(35)
12 ′ V IN ( max ) ′ L O SW
I COUT(rms) =
′ f
V OUT ′ ( V IN ( max ) - V OUT )
(36)
9.2.2.4 Catch Diode
The TPS54160A requires an external catch diode between the PH pin and GND. The selected diode must have
a reverse voltage rating equal to or greater than Vinmax. The peak current rating of the diode must be greater
than the maximum inductor current. The diode should also have a low forward voltage. Schottky diodes are
typically a good choice for the catch diode due to their low forward voltage. The lower the forward voltage of the
diode, the higher the efficiency of the regulator.
Typically, the higher the voltage and current ratings the diode has, the higher the forward voltage will be. Since
the design example has an input voltage up to 18 V, a diode with a minimum of 20V reverse voltage will be
selected.
For the example design, the B220A Schottky diode is selected for its lower forward voltage and it comes in a
larger package size which has good thermal characteristics over small devices. The typical forward voltage of the
B220A is 0.50 V.
The diode must also be selected with an appropriate power rating. The diode conducts the output current during
the off-time of the internal power switch. The off-time of the internal switch is a function of the maximum input
voltage, the output voltage, and the switching frequency. The output current during the off-time is multiplied by
the forward voltage of the diode which equals the conduction losses of the diode. At higher switch frequencies,
the ac losses of the diode need to be taken into account. The ac losses of the diode are due to the charging and
discharging of the junction capacitance and reverse recovery. Equation 37 is used to calculate the total power
dissipation, conduction losses plus ac losses, of the diode.
The B220A has a junction capacitance of 120pF. Using Equation 37 , the selected diode will dissipate 0.632 W.
This power dissipation, depending on mounting techniques, should produce a 16°C temperature rise in the diode
when the input voltage is 18 V and the load current is 1.5 A.
If the power supply spends a significant amount of time at light load currents or in sleep mode consider using a
diode which has a low leakage current and slightly higher forward voltage drop.
C j SW IN + V f d )
′ ( V
P D =
( V IN ( max ) - V OUT ) ′ I OUT
V IN ( max )
′ V f d
+
′ f
2
2
(37)
9.2.2.5 Input Capacitor
The TPS54160A requires a high quality ceramic, type X5R or X7R, input decoupling capacitor of at least 3 μ F of
effective capacitance and in some applications a bulk capacitance. The effective capacitance includes any dc
bias effects. The voltage rating of the input capacitor must be greater than the maximum input voltage. The
capacitor must also have a ripple current rating greater than the maximum input current ripple of the TPS54160A.
The value of a ceramic capacitor varies significantly over temperature and the amount of dc bias applied to the
capacitor. The capacitance variations due to temperature can be minimized by selecting a dielectric material that
is stable over temperature. X5R and X7R ceramic dielectrics are usually selected for power regulator capacitors
because they have a high capacitance to volume ratio and are fairly stable over temperature. The output
capacitor must also be selected with the dc bias taken into account. The capacitance value of a capacitor
decreases as the dc bias across a capacitor increases.
34
Copyright ? 2012–2014, Texas Instruments Incorporated
Product Folder Links: TPS54160 TPS54160A
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| TPS54160ADRCT | 功能描述:直流/直流开关转换器 3.5-60Vin,1.5A SD Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS54160DGQ | 功能描述:直流/直流开关调节器 3.5-60V 1.5A Step Down SWIFT Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54160DGQG4 | 功能描述:直流/直流开关调节器 3.5-60V,1.5A Step Down SWIFT Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54160DGQR | 功能描述:直流/直流开关调节器 3.5-60V 1.5A Step Down SWIFT Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54160DGQRG4 | 功能描述:直流/直流开关调节器 3.5-60V,1.5A Step Down SWIFT Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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