Details

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BUY UC2845BD1013TR https://www.utsource.net/itm/p/5343020.html
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

Parameter	Symbol	Min	Typical	Max	Unit	Description
Input Voltage	V_IN	7	-	40	V	Operating input voltage range
Switching Frequency	f_SW	100	-	500	kHz	Adjustable switching frequency
Maximum Duty Cycle	D_MAX	-	95	-	%	Maximum duty cycle of the PWM output
Start-Up Current	I_START	-	20	-	μA	Initial current required for startup
Quiescent Current	I_Q	-	3.5	-	mA	Current consumption in quiescent state
Error Amplifier Gain	A_EA	-	60	-	dB	Gain of the error amplifier
Reference Voltage	V_REF	-	2.5	-	V	Internal reference voltage
Compensation Pin Output	V_COMP	-	2.5	-	V	Output voltage at compensation pin
Overcurrent Protection	I_OCP	-	1.0	-	A	Threshold for overcurrent protection

Instructions for UC2845BD1013TR

1. Power Supply Connection:

   • Connect the input voltage (V_IN) to the appropriate power supply within the specified range (7V to 40V).

2. Frequency Setting:

   • Adjust the switching frequency using an external resistor connected to the RT/CT pin. The typical frequency range is from 100kHz to 500kHz.

3. Duty Cycle Control:

   • The maximum duty cycle is set internally to 95%. Ensure that the design does not exceed this limit to avoid malfunction.

4. Startup and Operation:

   • Ensure that the start-up current (I_START) requirements are met for proper initialization. The device typically requires about 20μA.

5. Error Amplifier Usage:

   • Use the error amplifier for feedback control. It has a gain of approximately 60dB, aiding in precise regulation.

6. Reference Voltage:

   • The internal reference voltage (V_REF) is set to 2.5V. This voltage can be used as a stable reference point for various circuit components.

7. Compensation Network:

   • Design a compensation network around the COMP pin to stabilize the feedback loop, ensuring stability and performance.

8. Overcurrent Protection:

   • Monitor the overcurrent protection threshold (I_OCP) which is set to 1.0A to safeguard against excessive currents.

9. Quiescent Current Management:

   • Be mindful of the quiescent current (I_Q) of 3.5mA, as it affects overall efficiency, especially in low-power applications.

For detailed application notes and further specifications, refer to the manufacturer's datasheet or official documentation.

(For reference only)