Details

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BUY IW1691-04 https://www.utsource.net/itm/p/12541631.html

Parameter	Description	Value
Part Number	Integrated Circuit	IW1691-04
Function	High Efficiency LED Driver IC	-
Input Voltage (VIN)	Operating Input Voltage Range	8V to 32V
Output Current (IOUT)	Maximum Output Current	1.5A
Switching Frequency (fSW)	Typical Switching Frequency	650kHz
Operating Temperature (TJ)	Junction Temperature Range	-40°C to +125°C
Package Type	Package Style	SOIC-8
Protection Features	Overcurrent Protection, Thermal Shutdown, Short-Circuit Protection	Yes
Quiescent Current (IQ)	Typical Quiescent Current	200μA
Efficiency	Maximum Efficiency	Up to 95%
Dimming Method	PWM Dimming	-
DIM Pin Function	Control Input for Dimming	-
FB Pin Function	Feedback Input for Output Current Regulation	-

Instructions:

1. Power Supply Connection:

   • Connect the input voltage (VIN) to the power supply within the specified range of 8V to 32V.
   • Ensure the ground (GND) is connected to the common ground of the system.

2. LED Connection:

   • Connect the LEDs in series or parallel as required, ensuring the total forward voltage is within the input voltage range.
   • Connect the cathode of the LED string to the OUT pin of the IC.

3. Feedback Configuration:

   • Connect a resistor divider from the output to the FB pin to set the desired output current.
   • The feedback resistor values should be chosen to provide the correct feedback voltage (typically 0.24V).

4. Dimming Control:

   • Apply a PWM signal to the DIM pin to control the brightness of the LEDs.
   • The PWM frequency should be within the range supported by the IC (typically up to 20kHz).

5. Thermal Management:

   • Ensure adequate heat dissipation by using a heatsink or thermal pad if necessary.
   • Monitor the junction temperature to ensure it remains within the operating range.

6. Protection Circuits:

   • The IC includes built-in overcurrent, thermal shutdown, and short-circuit protection.
   • No external components are required for these protections, but ensure the circuit design does not exceed the maximum ratings.

7. Layout Considerations:

   • Keep the high-current paths short and wide to minimize losses.
   • Use bypass capacitors close to the VIN and GND pins to filter noise and stabilize the input voltage.

8. Testing:

   • After assembly, test the circuit with a known load to verify proper operation.
   • Check the output current and dimming functionality to ensure they meet the design specifications.

(For reference only)