Details

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BUY UC3844AD. https://www.utsource.net/itm/p/12611126.html

Parameter	Symbol	Min	Typical	Max	Unit	Description
Supply Voltage	Vcc	10.0	15.0	35.0	V	Operating supply voltage range
Start-Up Current	Istart	-	1.0	-	mA	Current required to start the oscillator
Operating Current	Icc	2.0	3.5	5.0	mA	Quiescent current at Vcc
Oscillator Frequency	fosc	0.1	500.0	1000.0	kHz	Range of the internal oscillator
Error Amplifier Gain	Aea	-	50.0	-	V/渭A	Gain of the error amplifier
Error Amplifier Input Bias	Ibias	100.0	150.0	200.0	nA	Input bias current of the error amplifier
Error Amplifier Input Offset	Vos	-1.0	0.0	1.0	mV	Input offset voltage of the error amplifier
Reference Voltage	Vref	4.97	5.0	5.03	V	Internal reference voltage
Current Limit	Ilim	1.0	1.5	2.0	A	Maximum output current limit of the driver
Shutdown Current	Ishutdown	10.0	20.0	30.0	渭A	Current consumption in shutdown mode
Thermal Shutdown	Tsd	160.0	-	-	掳C	Temperature at which the device enters thermal shutdown
Storage Temperature	Tstg	-65.0	-	150.0	掳C	Temperature range for storage
Operating Temperature	Topr	-40.0	-	125.0	掳C	Temperature range for operation

Instructions for Use:

1. Supply Voltage (Vcc):

   • Ensure the supply voltage is within the specified range (10.0V to 35.0V).
   • Use a stable power source to avoid fluctuations that could affect performance.

2. Oscillator Frequency (fosc):

   • Set the desired frequency using an external resistor and capacitor connected to the RT/CT pin.
   • The formula for calculating the frequency is ( f_ = frac{1.8}{R times C} ).

3. Error Amplifier:

   • Connect the inverting input (IN) to the feedback network and the non-inverting input (REF) to the reference voltage.
   • Adjust the gain and offset as needed to achieve the desired regulation.

4. Current Limit:

   • The current limit is set by the internal circuitry and can be adjusted using an external resistor on the current sense pin (CS).
   • Ensure the sense resistor value is appropriate to limit the current to the desired level.

5. Thermal Management:

   • Monitor the temperature to ensure it does not exceed 160掳C, which triggers thermal shutdown.
   • Use proper heat sinking or cooling methods if operating in high-temperature environments.

6. Shutdown Mode:

   • To put the device into shutdown mode, pull the SHDN pin low.
   • The device will consume minimal current (10.0 to 30.0 渭A) in this mode.

7. Storage and Operating Temperature:

   • Store the device between -65掳C and 150掳C.
   • Operate the device between -40掳C and 125掳C for optimal performance.

8. Pin Configuration:

   • Refer to the datasheet for the specific pinout and ensure all pins are correctly connected to avoid damage or malfunction.

By following these instructions and parameters, you can effectively use the UC3844AD in your power supply or control circuit applications.

(For reference only)