If you were to draw the ZD-95-G-F schematic for a 7W LED bulb, it would look like this:
AC Input (90-265V) → Bridge Rectifier → Bulk Capacitor (400V)
│
├─── Resistor (Startup) → Pin 5 (VCC)
│
├─── Inductor/LED+ ──┐
│ │
Pin 6 (DRAIN) ←──┘ │
│ │
Pin 4 (CS) ──Resistor─→ GND
│
Pin 1 (FB) ← Resistor Divider ← LED+
Pin 2 (GND)
Pin 3 (NC or Capacitor to GND)
Key external components:
When you have the schematic (even a hand-drawn one), you can diagnose these typical failures: zd-95-g-f schematic
| Symptom | Likely Cause | Schematic Fix | |---------------------------------|-----------------------------------------------|-----------------------------------| | No output, VCC cycling 9-15V | Short on output; FB pin pulled high/low | Check output diode and LED load | | Output low, dim LED | CS resistor drifted high | Replace R_cs (1% metal film) | | IC cracks open | Overvoltage on DRAIN (spike) | Add snubber (R + C) across inductor| | Intermittent operation | VCC capacitor dried out | Replace 10-47µF electrolytic near IC | If you were to draw the ZD-95-G-F schematic
| Pin | Name | Function | |-----|----------|--------------------------------------------| | 1 | FB | Feedback input (connects to output via divider) | | 2 | GND | Ground | | 3 | COMP/NC | Compensation (or not connected) | | 4 | CS | Current sense (across sense resistor to GND)| | 5 | VCC | Supply voltage (usually 12-18V from auxiliary winding) | | 6 | DRAIN | Internal MOSFET drain (to transformer/inductor) | Key external components: When you have the schematic
Note: This is an aggregated pinout from similar SMD-coded parts. Always verify with a multimeter before powering.