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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： | 5/7页 |
| 文件大小： | 80K |
| 代理商： | LA5735M |
LA5735M
No.A0588-5/7
Diode D1
Low-impedance, high-frequency components designed for use in switching power supplies must be used for C1 and
C2 since large ripple currents flow in these capacitors. Note that if a ceramic capacitor, tantalum capacitor, or other
capacitor with an extremely low equivalent series resistance (ESR) is used for C2, abnormal oscillations may occur in
the output waveform. Do not use such a capacitor for C2.
The following equation gives the stability condition for the C2 capacitor and ESR values.
1
2
× π × C2 × ESR ≤ 20kHz Equation 5
Repetitive peak reverse voltage
The AC ripple currents flowing in the input capacitor will be larger currents than those flowing in the output
capacitors.
The RMS current is given by the following equation. Note that capacitors must only be used with currents that are
within their current ratings.
IC1=
VOUT
VIN
IOUT
2
1-
VOUT
VIN
+
1
12
× IR2 [Arms]
Output capacitor RMS current
Since the ripple current, an AC current, flowing in the output capacitors has a sawtooth waveform, the RMS value is
given by the following equation. Select output capacitors whose allowable ripple current rating is not exceeded by
this value.
IC2 =
1
2
√3 ×
VOUT (VIN - VOUT)
L
× fsw × VIN
[Arms]
fsw = Switching frequency 300kHz
Resistors R1 and R2
The resistors R1 and R2 set the output voltage. The error in the VOS pin voltage increases as the values used for these
resistors increase. Note also that the output voltage may rise due to leakage current in the switching transistors during
light load operation. For these reasons, R1 and R2 should be selected so that the current flowing in them is on the
order of 500
A.
R1=
1.23V
500
A ≈ 2.4k
We recommend values in the range 2.0 to 2.4k
R2=
VOUT
1.23V
-1
× R1
The following equation gives the output voltage set by R1 and R2.
VO= 1+
R2
R1
× 1.23V (typ)
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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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