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Low-cost Chinese IC (YX862A) for solar-powered garden lights: Charges NiCd battery from solar cell, boosts voltage for constant/blinking LEDs. Perfect for DIY outdoor LEDs, emergency lights, or embedded prototypes—matches your PCB experimentation style.
- Solar Charging: Direct solar input (SOL) trickle-charges NiCd BAT (1.2V typical).
- LED Driving: Boost converter (LX inductor) powers LEDs at VDD; supports constant light (VCC) or blinking (MOD to GND).
- Status Flags: PWROK/PWRFLAG open-drain for low-battery alert; PGND separated for noise.
- Mode Control: MOD pin selects LED modes (GND for blink, float/open for constant).
- Efficiency: ~80-85% boost; TSET1/2 thermistors for temp protection.
- Compact: Single-chip SMD solution (SOP-8), fits 1-layer PCB.
- Daytime: Solar cell voltage on SOL charges NiCd BAT via internal linear regulator.
- Nighttime: BAT powers boost (LX coil, diodes) to VDD (~3V for LEDs).
- LED Modes:
- VCC to LEDs: Constant light.
- MOD to GND: Blinking/flashing (internal oscillator).
- Protection: PWROK flags low BAT; PWFLAG for over-discharge.
- Tested for NiCd (not Li-ion watch polarity/reverse charging).
| Ref | Component | Value/Type | Footprint | Example | Qty | Notes |
|---|---|---|---|---|---|---|
| C1 | Cap | 10uF | 0603 | MLCC | 1 | VDD filter |
| U1 | IC | YX862A | SOP-8 | AliExpress | 1 | Solar LED driver |
| L1 | Inductor | 10-47uH | Axial/SMD | 22uH/1A | 1 | Boost LX (>1MHz) |
| R1-R2 | Res | 4.7k/47k | 0603 | 1% | 4 | Divider/TSET |
| LED1/2 | LED | White 0603 | 0603 | High-bright | 2 | String/array |
| J1-J3 | Conn | Solar/BAT/LED | Header | 2-pin | 3 | Prototyping |
Sourcing: AliExpress/LCSC (~$0.20/IC), JLCPCB assembly.
- Solar Input: 2-6V panel to SOL/GND.
- Battery: NiCd AA/AAA to BAT/PGND (observe polarity!).
- LEDs: VCC to LED+ chain, LED- to GND.
- Modes: Short MOD-GND for blink; leave open for constant.