Details

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BUY UA78M33C https://www.utsource.net/itm/p/12611787.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN	-	4.5	-	35	V
Output Voltage	VOUT	-	-	33	-	V
Output Current (Max)	IOUT	-	-	100	200	mA
Line Regulation	-	VIN = 5V to 35V	-	0.01	-	%/V
Load Regulation	-	IOUT = 0 to 200mA	-	0.01	-	%/mA
Dropout Voltage	VD	IOUT = 100mA	-	1.7	-	V
Quiescent Current	IQ	VIN = 35V, no load	-	5	-	mA
Ripple Rejection	-	10Hz to 120Hz	-	70	-	dB
Operating Temperature	TJ	-	-40	-	125	掳C
Storage Temperature	TSTG	-	-65	-	150	掳C

Instructions for Using the UA78M33C

1. Input Voltage (VIN):

   • Ensure the input voltage is within the range of 4.5V to 35V.
   • The input voltage must be at least 1.7V higher than the output voltage to maintain regulation.

2. Output Voltage (VOUT):

   • The output voltage is fixed at 33V. No external components are required to set this voltage.

3. Output Current (IOUT):

   • The maximum continuous output current is 200mA, but it can typically provide up to 100mA without significant thermal issues.
   • For higher currents, ensure proper heat dissipation.

4. Line Regulation:

   • The line regulation is very low, typically 0.01% per volt, ensuring stable output even with input voltage variations.

5. Load Regulation:

   • The load regulation is also very low, typically 0.01% per milliamp, ensuring stable output even with load variations.

6. Dropout Voltage:

   • The dropout voltage is 1.7V at 100mA. Ensure the input voltage is at least 1.7V above the output voltage to maintain regulation.

7. Quiescent Current:

   • The quiescent current is typically 5mA at 35V input with no load. This is the current consumed by the regulator itself.

8. Ripple Rejection:

   • The ripple rejection is 70dB from 10Hz to 120Hz, effectively reducing input ripple on the output.

9. Operating Temperature (TJ):

   • The operating temperature range is from -40掳C to 125掳C. Ensure the device is used within this range to avoid thermal damage.

10. Storage Temperature (TSTG):

    • The storage temperature range is from -65掳C to 150掳C. Store the device in a dry environment to prevent moisture damage.

11. Heat Dissipation:

    • For applications requiring high output current, use a heatsink to dissipate excess heat and maintain the junction temperature within the safe operating range.

12. Capacitors:

    • Use a 0.33渭F capacitor on the input and a 0.1渭F capacitor on the output for stability and noise reduction. These capacitors should be placed as close as possible to the regulator.

13. PCB Layout:

    • Ensure good PCB layout practices to minimize noise and improve performance. Keep the ground plane solid and wide, and use short traces for power and ground connections.

14. Safety Precautions:

    • Always handle the device with care to avoid static damage. Follow standard ESD precautions when handling the component.
    • Do not exceed the maximum ratings specified in the table to prevent damage to the device.

(For reference only)