参数资料
| 型号： | AP6502SP-13 |
| 厂商： | Diodes Inc |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 8SO |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.925 V ~ 16 V |
| 输入电压： | 4.75 V ~ 18 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 340kHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-SO 裸露焊盘 |
| 其它名称： | AP6502SP-13DIDKR |
AP6502
Applications Information (cont.)
Compensation Components (cont.)
The control loop transfer function incorporates two poles one is due to the compensation capacitor (C3) and the output resistor of error
amplifier, and the other is due to the output capacitor and the load resistor. These poles are located at:
f P1 =
f P2 =
G EA
2 π × C 3 × A VEA
1
2 π × C 2 × R LOAD
Where G EA is the error amplifier trans-conductance.
One zero is present due to the compensation capacitor (C3) and the compensation resistor (R3). This zero is located at:
f Z1 =
1
2 π × C 3 × R 3
The goal of compensation design is to shape the converter transfer function to get a desired loop gain. The system crossover frequency
where the feedback loop has the unity gain is crucial.
A rule of thumb is to set the crossover frequency to below one-tenth of the switching frequency. Use the following procedure to optimize the
compensation components:
1. Choose the compensation resistor (R3) to set the desired crossover frequency. Determine the R3 value by the following equation:
× OUT <
× OUT
R 3 =
2 π × C2 × fc
G EA × G CS
V
V FB
2 π × C2 × 0 .1 × fs
G EA × G CS
V
V FB
Where f C is the crossover frequency, which is typically less than one tenth of the switching frequency.
2. Choose the compensation capacitor (C3) to achieve the desired phase margin set the compensation zero, f Z1 , to below one fourth of the
crossover frequency to provide sufficient phase margin. Determine the C3 value by the following equation:
Where R3 is the compensation resistor value.
C 3 >
2
π × R 3 × fc
V OUT
(V)
1.2
1.8
2.5
3.3
5
12
C IN /C1
(μF)
22
22
22
22
22
22
C OUT /C2
(μF)
47
47
47
47
47
47
R C /R3
(k ? )
3.24
6.8
6.8
6.8
6.8
6.8
C C /C3
(nF)
6.8
6.8
6.8
6.8
6.8
6.8
L1
(μH)
3.3
3.3
10
10
10
15
Table 2 – Recommended Component Selection
Inductor
Calculating the inductor value is a critical factor in designing a buck converter. For most designs, the following equation can be used to
calculate the inductor value;
L =
VOUT ? (VIN ? VOUT )
V IN ? Δ I L ? f SW
Where Δ I L is the inductor ripple current.
And f SW is the buck converter switching frequency.
Choose the inductor ripple current to be 30% of the maximum load current. The maximum inductor peak current is calculated from:
I L(MAX) = I LOAD +
Δ IL
2
AP6502
Document Number: DS35423 Rev. 9 - 2
10 of 15
www.diodes.com
January 2013
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AP6503 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:340kHz 23V 3A SYNCHRONOUS DC/DC BUCK CONVERTER |
| AP6503ASP-13 | 功能描述:直流/直流开关转换器 240kHz 23V 2A Synch DC/DC Buck Conv 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 |
| AP6503SP-13 | 功能描述:直流/直流开关转换器 SMPS Converter HV POWER SUPPLY 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 |
| AP6507 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:500 kHz 18V 3A SYNCHRONOUS DC/DC BUCK CONVERTER |
| AP6507SP-13 | 功能描述:直流/直流开关转换器 SWITCHING REG CONV POWER SUPPLY 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 |
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