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参数资料
| 型号： | LA5735M |
| 元件分类： | 稳压器 |
| 英文描述： | 0.6 A SWITCHING REGULATOR, 360 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | 0.225 INCH, MFP-5 |
| 文件页数： | 4/7页 |
| 文件大小： | 80K |
| 代理商： | LA5735M |
LA5735M
No.A0588-4/7
Choke coil L1
Note that choke coil heating due to overload or load shorting may be a problem.
The inductance value can be determined from the following equation once the input voltage, output voltage, and
current ripple conditions are known.
IR indicates the ripple current value.
Reference example : VIN = 12V, VOUT = 5V, IR = 150mA
L =
VIN - VOUT - Vsat
IR
× Ton
=
12 - 5.0 - 1.0
0.15
× 1.58 × 10-6
≈ 68
H
Ton =
T
((VIN - VOUT - Vsat)/(VOUT + VF)) + 1
Toff = T - Ton
t : Switching repetition period 3.33
s is assumed for the calculation
VF : Schottky diode forward voltage 0.4V is assumed for the calculation
Inductance current : peak value
The ripple current peak value must be held within the rated current values for the inductor used.
Here, IRP is the peak value of the ripple current. IRP can be determined from the following equation.
Reference example : VIN = 12V, VOUT = 5V, IOUT = 0.5A, L = 68H
IRP = IOUT +
VIN - VOUT - Vsat
2L
× Ton
= 0.5 +
12 - 5.0 - 1.0
2
× 68 × 10-6 × 1.58 × 10
-6
≈ 0.57A
Inductance current : ripple current value
Here
IR is the ripple current. IR can be determined from the following equation.
If the load current becomes less than one half the ripple current, the inductor current will become discontinuous.
IR =
VIN - VOUT - Vsat
L
× Ton
=
12 - 5.0 - 1.0
68
× 10-6 × 1.58 × 10
-6
≈ 0.15A
Diode D1
A Schottky barrier diode must be used for this diode.
If a fast recovery diode is used, it is possible that the IC could be destroyed by the applied reverse voltage due to the
recovery and the on-state voltage.
Diode current (peak current)
Applications must be designed so that the peak value of the diode current remains within the rated current of the
diode.
The peak value of the diode current will be the same current as the peak value of the inductor current.
Repetitive peak reverse voltage
Applications must be designed so that the repetitive peak reverse voltage remains within the voltage rating of the
diode.
Here, VRRM is the repetitive peak reverse voltage. VRRM can be determined from the following equation.
VRRM ≥ VCC
Since noise voltage and other terms will be added in actual operation, the voltage handling capacity of the device
should be about 1.5 times that given by the above calculation.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LA5735MC | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Monolithic Linear IC Separately-Excited Step-Down Switching Regulator(Variable Type) |
| LA5735MC-AH | 功能描述:直流/直流开关调节器 PWR SWITCHING REGULATOR 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 |
| LA5735MC-BH | 功能描述:直流/直流开关调节器 PWR SWITCHING REGULATOR 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 |
| LA5735M-TE-L-E | 功能描述:直流/直流开关调节器 SWITCHING REGULATOR 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 |
| LA5735M-TLM-E | 功能描述:直流/直流开关调节器 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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