参数资料
| 型号： | AP5004SG-13 |
| 厂商： | Diodes Inc |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2.5A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 6 V |
| 输入电压： | 10 V ~ 32 V |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 无 |
| 工作温度： | -10°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOP |
AP5004
PWM CONTROL 2.5A STEP-DOWN CONVERTER
Functional Description
PWM Control
The AP5004 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. The PWM
controller is internally clocked by a fixed 300KHz oscillator.
When used as a converter, the AP5004’s pulse width varies in a range from 0% to 90%, according to the load
current. The ripple voltage produced by the switching can easily be removed through a filter because the
switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges
of input voltage and load current.
Enable Control
The Enable Control allows the output of the AP5004 to be turned ON or OFF. Connecting the Enable pin to GND
or any voltage source lower than 0.8V will turn the output OFF. In the OFF state, the current drawn through the
V CC input is approximately 2 μ A. Please note that the slew rate from ON to OFF must be >0.013v/ μ s to ensure
proper operation.
BOOST Capacitor
This capacitor boosts the gate drive to the internal MOSFET above V IN to fully turn it ON thus minimizing
conduction losses in the power switch to maintain high efficiency. The recommended value of the capacitor is
0.1 μ F. The capacitor must be connected from pin 3 to the switch output, pin 4.
Feedback
This is the input to a two-stage high gain amplifier, which drives the PWM controller. Two external resistors are
required to set the DC output voltage. For stable operation of the power supply, it is important to prevent coupling
of any inductor flux to the feedback input.
Current Limit
The current limit threshold is set by the internal circuit such that the minimum switching current is 3.5A. If the
switching current exceeds the threshold, the output voltage will drop and the switching frequency will be reduced
to 50KHz.
Inductor Selection
Most designs operate with inductors of 15μH to 33μH. The inductor value can be derived from the following
equation:
L =
( VIN ? VOUT ) VOUT
Δ I L × f osc × V IN
Large value inductors will result in a lower ripple current where as small value inductors will result in high ripple
currents. The inductor ripple current should be set to approximately 15% of the maximum load current 2.5A,
? IL=0.375A. The DC current rating of the inductor should be at least equal to the maximum load current plus half
the ripple current to prevent core saturation (2A+0.19A).
Input Capacitor Selection
The input current to the step-down converter is discontinuous, and therefore an input capacitor C2 is required to
supply the AC current to the step-down converter while maintaining the DC input voltage. A low ESR capacitor is
required to keep the noise at the IC to a minimum. Its RMS current rating should be greater than approximately
half of the DC load current.
AP5004
Document number: DS31444 Rev. 5 - 2
8 of 11
August 2010
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AP5004SG-U | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:PWM CONTROL 2.5A STEP-DOWN CONVERTER |
| AP501 | 功能描述:射频放大器 1930-1990MHz 32.5dB Gain RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel |
| AP5012 | 制造商:American Power Conversion Corp (APC by Schneider Electric) 功能描述:SUN BRACKET SET FOR RACKMOUNT 制造商:Schneider Electric 功能描述:SUN BRACKET SET FOR RACKMOUNT KEYBOARD MONITOR MOUSE - Bulk |
| AP5014 | 制造商:Schneider Electric 功能描述:APC - Bulk |
| AP5015 | 制造商:American Power Conversion Corp (APC by Schneider Electric) 功能描述:RACKMOUNT;KEYBRD;MONITOR;MOUSE |
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