FM8502D from Shenzhen Fuman, in a SOP-7. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	GND	power_in	Chip ground reference. All small-signal grounds and the CS sense-resistor low side should return here, tied to the bulk-cap negative terminal at a single point.
2	ROVP	input	Open-circuit (output) over-voltage protection setpoint. An external resistor to GND sinks ~30 uA (22-38 uA) from this pin to program Vovp. Pin doubles as an Enable input: below ~240 mV the chip disables switching (Iout=0); above ~400 mV (VEnable) switching resumes, enabling switch-based color-temperature dimming. Leave floating if OVP/Enable is not used.
3	NC	unconnected	No connect. Must be left floating (open) to preserve the required creepage distance between HV-adjacent pins and the low-voltage pins.
4	HV	power_in	High-voltage supply input, rated up to 700 V absolute max. Connects (typically through the rectified bulk-cap positive rail) to the internal high-voltage JFET that charges the internal VCC. Turn-on threshold Vhv_ON = 7.5-9 V; UVLO Vhv_OFF = 5.9-7.5 V. Route away from CS and ROVP traces.
5	DRAIN	power_out	Drain of the internal 500 V power MOSFET (one of two paralleled DRAIN pins, 5 and 6). Connects to the switching node of the buck inductor. For the FM8502D variant, RDS(on) is ~3 Ω and peak drain current rating is 1100 mA @ TJ=100 °C. Increase copper area for thermal dissipation, but not excessively (EMI trade-off).
6	DRAIN	power_out	Drain of the internal 500 V power MOSFET (second of two paralleled DRAIN pins, 5 and 6). Tie to pin 5 at the switching node. Absolute max drain voltage -0.3 to 500 V.
7	CS	input	Current sense input. External sense resistor Rcs from source of the internal MOSFET to GND; CS taps the top of Rcs. Peak-current comparator threshold Vcs_TH = 373 mV (365-381 mV), with 500 ns leading-edge blanking and 200 ns turn-off delay. LED current is Ipk/2 = 0.373 V / (2·Rcs). Absolute max -0.3 to 8 V.

Key specifications

Parameter	Value
Manufacturer	Shenzhen Fuman
Package	SOP-7
Category	LED-drv
Pins	7

Ordering variants

Same part, different packaging or reel option.

FM8502DD
FM8502DDD

CAD (KiCad official)

Symbol: FM8502D
Footprint: Package_SO:SOIC-8-N7_3.9x4.9mm_P1.27mm
3D model: SOP-7 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Shenzhen Fuman datasheet (9 pp, sha256 22da0f69a6eb4874, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF