Choose R2 = 1kΩ. Then R1 = (5V/0.8V – 1) * 1kΩ = 5.25kΩ (use 5.1kΩ + 150Ω in series).
| Parameter | Conditions | Min | Typ | Max | Unit | |-----------|------------|-----|-----|-----|------| | Output voltage accuracy | Iout=0.5A | ±1 | ±2 | % | | Line regulation | Vin=6V to 24V, Iout=1A | 0.1 | 0.3 | % | | Load regulation | Iout=0.1A to 3A | 0.2 | 0.5 | % | | Output ripple (20MHz BW) | C_out=100µF electrolytic | 30 | 50 | mVpp | | Switching frequency | 450 | 500 | 550 | kHz | | Quiescent current | No load, Vout=5V | 4 | 6 | mA | | Shutdown current | ADJ pin grounded | 80 | 120 | µA | gyd-9e datasheet
A: Only if you add a constant-current/constant-voltage (CC-CV) control loop. The GYD-9E is a voltage source, not a charger. Conclusion The GYD-9E is a versatile, efficient, and compact step-down converter suitable for a wide range of DIY and industrial applications. While its official datasheet can be difficult to locate due to the generic branding, the electrical characteristics and pinout described above follow the de facto standard for this module. Choose R2 = 1kΩ
Where R2 is connected between ADJ pin and GND, and R1 between VOUT and ADJ. The GYD-9E is a voltage source, not a charger
With RθJA = 45°C/W, temperature rise = 171°C → . Solution: Add a heatsink or forced airflow, or reduce input voltage to 12V. This example shows the importance of checking thermal limits in the datasheet. 13. Frequently Asked Questions (FAQ) Q1: Is the GYD-9E isolated? A: No. It is a non-isolated buck converter. The input ground and output ground are common.