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BL8501

SHANGHAI BELLING
Part Number BL8501
Manufacturer SHANGHAI BELLING
Description Step down DC/DC controller
Published Dec 18, 2006
Detailed Description www.DataSheet4U.com BL8501 Step down DC/DC controller OUTLINE The BL8501 is a CMOS-based PWM step-down DC-DC Converter ...
Datasheet PDF File BL8501 PDF File

BL8501
BL8501

Overview
www.
DataSheet4U.
com BL8501 Step down DC/DC controller OUTLINE The BL8501 is a CMOS-based PWM step-down DC-DC Converter controller.
The device can offer the following advantages: lower supply current and wider operating input-voltage range.
The BL8501 consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, a chip enable circuit, and detecting input voltage circuit.
A low ripple, high efficiency step-down DC-DC converter can be easily composed of this IC with only several external components, or a power-transistor, an inductor, a diode and capacitors.
Output Voltage can be adjusted with external resistors.
FEATURES Range of input Voltage: 3.
5V~12V Built-in Soft-start Function and Protection Function (Reset type protection) Oscillation Frequency: 500KHz High efficiency: 90% High Accuracy Output Voltage: 2.
0% Low Temperature-Drift Coefficient of Output Voltage: Typ: 100ppm/°C Operating Temperature Range: -20 ~85 APPLICATIONS Power source for hand-held communication equipment, cameras, video instruments such as VCRs, camcorders.
Power source for battery-powered equipment.
Power source for household electrical appliances.
PIN CONFIGURATION SOT-23-5L PIN DESCRIPTION Pin No.
1 2 3 4 5 Symbol CE GND VFB EXT VIN Description Chip Enable Pin (Active with “H”) Ground Pin Pin for Feedback Voltage External Transistor Drive Pin (CMOS Output) Power Supply Pin DETAILED DESCRIPTION http://www.
belling.
com.
cn - 1Total 10 Pages 8/8/2006 BL8501 The following description refer to the functional block diagram: Error Amplifier The error amplifier is a high-gain differential amplifier used to regulate the converter output voltage.
The amplifier generates an error signal, which is fed to the PWM comparator.
The error signal is generated when a sample of the output voltage is compared to the internal reference and the difference is amplified.
The output sample is obtained f...


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