Details

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BUY LM3578AN https://www.utsource.net/itm/p/12603991.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Supply Voltage	Vcc	-	12	36	40	V
Switching Current Limit	Ilim	-	1.0	1.5	2.0	A
Oscillator Frequency	fosc	RT = 0惟	100	120	140	kHz
Oscillator Frequency	fosc	RT = 10k惟	60	70	80	kHz
Duty Cycle Range	D	-	0.4	-	0.9	-
Reference Voltage	Vref	-	1.22	1.24	1.26	V
Shutdown Input Current	Iis	Vcc = 36V, Vsh = 0V	-	0.1	1.0	渭A
Thermal Shutdown Temperature	Tstg	-	160	-	-	掳C
Operating Junction Temperature	Tjop	-	-40	125	-	掳C

Instructions for Using LM3578AN

1. Supply Voltage (Vcc):

   • The supply voltage should be between 12V and 40V. Ensure that the input voltage is within this range to avoid damage to the device.

2. Switching Current Limit (Ilim):

   • The switching current limit is typically around 1.5A but can vary from 1.0A to 2.0A. This parameter helps protect the device from overcurrent conditions.

3. Oscillator Frequency (fosc):

   • The oscillator frequency can be adjusted by changing the value of the external resistor (RT). For RT = 0惟, the frequency is approximately 120kHz. For RT = 10k惟, the frequency is around 70kHz.

4. Duty Cycle Range (D):

   • The duty cycle can range from 0.4 to 0.9. This allows for flexible control over the output voltage and current.

5. Reference Voltage (Vref):

   • The reference voltage is typically 1.24V, with a tolerance of 卤2%. This voltage is used as a stable reference for feedback and control circuits.

6. Shutdown Input Current (Iis):

   • The shutdown input current is very low, typically around 0.1渭A, which makes the device suitable for low-power applications.

7. Thermal Shutdown Temperature (Tstg):

   • The device will automatically shut down if the junction temperature exceeds 160掳C to prevent thermal damage.

8. Operating Junction Temperature (Tjop):

   • The operating junction temperature range is from -40掳C to 125掳C. Ensure that the device operates within this temperature range to maintain reliability.

Additional Notes:

• Always use appropriate heat sinking if the device is expected to operate at high power levels or in high ambient temperatures.
• Ensure that all external components, such as resistors and capacitors, are rated for the expected operating conditions.
• Refer to the datasheet for detailed circuit diagrams and application notes.

(For reference only)