Details
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| Parameter | Symbol | Min | Typ | Max | Unit | Description |
|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 15 | - | 40 | V | Operating supply voltage range |
| Start Current | IST | - | 2.3 | - | mA | Current needed to start the oscillator |
| Maximum Duty Cycle | DMAX | - | 0.5 | - | - | Maximum allowed duty cycle |
| Frequency | FSW | 25 | - | 600 | kHz | Switching frequency range |
| Output Voltage Error | VERR | - | 1.24 | - | V | Reference voltage for error amplifier |
| Minimum On Time | TONMIN | 1.7 | - | - | 渭s | Minimum on time of the power switch |
| Maximum Off Time | TOFFMAX | - | 28 | - | 渭s | Maximum off time of the power switch |
| Current Limit Threshold | ILIM | - | 0.95 | - | A | Current limit threshold |
| Thermal Shutdown | TSD | - | 160 | - | 掳C | Temperature at which thermal shutdown occurs |
Instructions for Using L6562
Power Supply Connection: Connect the supply voltage (VCC) within the specified range of 15V to 40V.
Start-Up Configuration: Ensure the start current (IST) is set around 2.3mA for proper oscillator initiation.
Frequency Setting: Adjust the switching frequency (FSW) between 25kHz and 600kHz as per application requirements.
Duty Cycle Management: Maintain the duty cycle below 0.5 to prevent potential operational issues.
Error Amplifier Adjustment: Set the output voltage error (VERR) close to 1.24V for optimal performance of the error amplifier.
Timing Parameters: Configure the minimum on time (TONMIN) and maximum off time (TOFFMAX) according to the design specifications to ensure stable operation.
Current Limiting: Monitor and set the current limit threshold (ILIM) to approximately 0.95A to protect against overcurrent conditions.
Thermal Protection: Be aware of the thermal shutdown temperature (TSD) of 160掳C to safeguard against overheating.
Component Selection: Choose external components like resistors and capacitors that are compatible with these parameters for reliable circuit operation.
Layout Considerations: Follow good PCB layout practices, ensuring short traces for high-frequency paths and adequate heat dissipation for critical components.
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