PWM CONTROL 3A STEP-DOWN CONVERTER
DESCRIPTION
The UTC P3586 is a fixed 1.2MHz frequency, voltage mode, PWM
controller with an internal power MOSFET. It supplies 3A continuous
output current over a wide input supply range with excellent load and line regulation.
An internal reference voltage source provides low output voltage down
to 0.8V for further applications. A PWM control circuit can provide 0~100% duty ratio.
The reliability of UTC P3586 achieved by such protection circuits. An UVLO (Under voltage lock output) circuit
monitors the VCC supply voltage to prevent wrong logic controls. The controller’s OCP (Over current protection)
circuit monitors the output current by using the voltage drop across the power MOSFET’s RDS saving the use of a
current sensing resistor. Over current protection circuit also monitors the voltage on FB pin under short-circuit
conditions.
The UTC P3586 is generally applied in portable devices. For maximum flexibility in determining loop dynamic,
this device is equipped with compensation pin. In addition, it is requiring less external components for operation due
to its configuration.
FEATURES
* 3A Output Current
* 1.2MHz Frequency
* Input Voltage Range: 3.6V to 23V
* 10μA Shutdown Supply Current
* Output Voltage Varies from 0.8V to VCC
* Frequency fold back at Short Circuit
* Protection Circuits: UVLO, Thermal Shutdown, OCP
*Low ESR Output Capacitor (Multi-Layer Chip Capacitor (MLCC)) Application.
* Halogen Free |
