component
ld7838gr
Public Unreviewedby Ray
Leadtrend Tech LED Drivers, SOP-7. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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markdownLD7838GR
Leadtrend Tech · LED Drivers · SOP-7
LD7838GR from Leadtrend Tech, 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 | ZCD | input | Quasi-resonance zero-current detector and programmable maximum ON-time input. Input threshold ~0.2V (with 0.1V hysteresis), clamped between ~-0.3V and ~4.7V. ZCD OVP trips at ~3.5V for output over-voltage protection. |
| 2 | COMP | input | Feedback/compensation pin. Connect a photo-coupler to close the control loop for regulation. Open-loop voltage ~5.0-5.8V; OLP trip ~4.6V; zero-ON-time burst threshold ~0.5V. Requires a 0.22-4.7uF filter capacitor. |
| 3 | CS | input | Current sense pin for the external MOSFET; pulse-by-pulse OCP threshold ~0.85V, secondary diode-short threshold ~1.2V. Includes ~425ns leading-edge blanking. Recommended R-C filter: 100-2k ohm and 100-680 pF. |
| 4 | GND | power_in | Device ground reference for all internal circuitry and the gate driver return. |
| 5 | OUT | output | Gate drive output for the external power MOSFET. CMOS totem-pole with ~125mA source / -500mA sink capability, clamped at ~13V for gate protection. Absolute range -0.3V to VCC+0.3V. |
| 6 | VCC | power_in | Controller supply pin. Operating range 9.5-27.5V; UVLO ON ~16V, UVLO OFF ~8V, VCC OVP ~28V, PDR ~7.5V, absolute max 30V. Requires 4.7-22uF bulk plus a 0.1-0.47uF SMD ceramic close to the pin. |
| 8 | HV | power_in | High-voltage startup pin (700V rated). Connect to the positive terminal of the main bulk cap to source ~1.8mA startup current until VCC reaches UVLO(on); then the internal HV current source is disabled to minimize standby loss. Also senses Brown-in/Brown-out (~90V DC in / hysteresis ~10V). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Leadtrend Tech |
| Package | SOP-7 |
| Category | LED-drv |
| Pins | 7 |
Ordering variants
LD7838GR
CAD (KiCad official)
- Symbol:
LD7838GR - 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: Leadtrend Tech datasheet (None pp, sha256
1356d9883c089a39, retrieved 2026-08-17, tier: lcsc) - 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).