component

OB3635AMP

Public Made by Adom

by adom

OB On Bright Elec LED Drivers, SOT-23-6. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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OB3635AMP

OB On Bright Elec · LED Drivers · SOT-23-6

OB3635AMP from OB On Bright Elec, in a SOT-23-6. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 FB input Voltage feedback from the auxiliary winding through a resistor divider reflecting the output voltage; the FB pin falling below 0.05V (typical) starts a new switching cycle for quasi-resonant operation, and FB above 1.5V (typical) triggers LED open-circuit protection.
2 GND power_in Power ground.
3 VDD power_in Power supply input supplied from the transformer auxiliary winding; VDD over-voltage protection triggers above 32V (typical) and the absolute maximum VDD voltage is 40V.
4 GATE output Gate driver output for the external power MOSFET, internally clamped at 12V (typical) and pulled low when VDD falls below UVLO(ON).
5 CS input Current sensing terminal, connected through a sense resistor between the MOSFET source and GND; the internal leading edge blanking time is 0.4 us and the over-current threshold is 1.1V (typical) when FB is above 0.25V.
6 CMP output Loop compensation pin with a large external capacitor connected between CMP and GND, whose clamp-down voltage is 1.0V.

Key specifications

Parameter Value
Manufacturer OB On Bright Elec
Package SOT-23-6
Category LED Drivers
Pins 6

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
VDD Voltage -0.3 40 V 2
Gate Voltage -0.3 40 V 2
CS Input Voltage -0.3 7 V 2
FB Input Voltage -0.3 7 V 2
COMP Voltage -0.3 7 V 2
Min/Max Operating Junction Temperature TJ -40 150 ℃ 2
Min/Max Storage Temperature Tstg -55 150 ℃ 2
Lead Temperature (Soldering) 260 ℃ Soldering, 10secs 2
VDD under voltage lockout exit UVLO(OFF) 16 18 20 V 5
VDD under voltage lockout enter UVLO(ON) 7 8 9 V 5
VDD Over Voltage Protection VDD_OVP 30 32 34 V 5
Over Current Threshold Vth_ocp 1.05 1.1 1.15 V FB>0.25V 5
Output Over Voltage Protection Vout_ovp 1.42 1.5 1.58 V 5
Error Amplifier Reference Voltage Vref 0.196 0.2 0.204 V 5
Output Up-Clamping Voltage Vclamp 10 12 14 V 5
Operation current I op 0.4 0.6 mA VDD=20V, no loading 5
Start up current I start-up 3 7 uA VDD=UVLO(OFF)-1V 5
LEB time TLEB 0.4 us 5
Over Current Threshold Vth_ocp 0.5 V FB<=0.25V 5
Output Short Circuit Protection Vout_scp 0.25 V 5
Maximum Clamping Frequency Fmax 100 KHz 5
Maximum Off Time Toff_max 100 us 5
Minimum Off Time Toff_min 2 us CS>0.15V 5
Minimum Off Time Toff_min 0.5 us CS<=0.15V 5
Maximum On Time Ton_max 25 us 5
Error Amplifier Transconductance Gm 40 uS 5
CMP Pin Down_clamp Voltage Vclamp_cmp 1 V 5
Output Low Level Vol 1 V Iout=10mA 5
Output High Level Voh 6 V Iout=10mA 5
Rising Edge Time Tr 90 ns Cl=1nF 5
Falling Edge Time Tf 30 ns Cl=1nF 5
Thermal regulation threshold TTF 145 ℃ 5
Over Temperature Protection OTP 170 ℃ 5
Package thermal resistance junction-to-ambient RθJA 200 ℃/W SOT23-6 package 2

CAD (KiCad official)

  • Symbol: OB3635AMP
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-23-6 (KiCad packages3D, STEP)
  • 3D model files: ob3635amp-etched.step / ob3635amp-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ob3635amp.step / ob3635amp.glb are the bare package body.

Provenance

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

  • Datasheet: OB On Bright Elec datasheet (10 pp, sha256 34e18cfb0a835ae6, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF