Details

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BUY L6571B https://www.utsource.net/itm/p/12360110.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Supply Voltage	VCC	Operating	16.5	-	30	V
Start-Up Current	IST		2	-	8	mA
Quiescent Current	IQ	No load	4	-	7	mA
Oscillator Frequency	fosc	RT = 100 kΩ, CT = 22 pF	25	50	100	kHz
Maximum Duty Cycle	DMAX		90	-	-	%
Minimum On-Time	tonmin		1.8	-	-	μs
Minimum Off-Time	toffmin		1.8	-	-	μs
Overcurrent Protection	ICP	Threshold	0.8	-	1.2	V
Thermal Shutdown	TSD		160	-	-	°C

Instructions for L6571B

1. Supply Voltage (VCC):

   • Ensure the supply voltage is within the range of 16.5V to 30V for proper operation.

2. Start-Up Current (IST):

   • The start-up current should be between 2mA and 8mA. This ensures the device initializes correctly without excessive power draw.

3. Quiescent Current (IQ):

   • When no load is present, the quiescent current should remain between 4mA and 7mA to minimize power consumption.

4. Oscillator Frequency (fosc):

   • Set the oscillator frequency using external resistor (RT) and capacitor (CT). For typical applications, use RT = 100 kΩ and CT = 22 pF to achieve a frequency range of 25kHz to 100kHz.

5. Maximum Duty Cycle (DMAX):

   • Limit the duty cycle to a maximum of 90% to prevent overdriving the output stage.

6. Minimum On-Time (tonmin) and Minimum Off-Time (toffmin):

   • Ensure that the minimum on-time and off-time are both at least 1.8μs to avoid instability in switching operations.

7. Overcurrent Protection (ICP):

   • The overcurrent protection threshold is set between 0.8V and 1.2V. Monitor this parameter to protect against excessive current conditions.

8. Thermal Shutdown (TSD):

   • The device will initiate thermal shutdown if the temperature exceeds 160°C. Design adequate heat dissipation to prevent this from occurring under normal operating conditions.

(For reference only)