HV9911 — High-Power Switch-Mode LED Driver Controller

Overview

The HV9911 (HV9911NG-G) is an advanced universal high-voltage switch-mode LED driver controller IC manufactured by Microchip Technology (originally Supertex). Packaged in a 16-lead SOIC or 24-lead QFN, it features an internal high-voltage linear regulator capable of operating directly from 9.0V to 250.0V DC power rails.

Unlike open-loop current regulators, the HV9911 implements closed-loop peak current-mode control combined with an internal 1.0A peak MOSFET gate driver (GATE). It supports multiple switching converter topologies—including Buck, Boost, SEPIC, and Buck-Boost—making it ideal for high-power industrial LED luminaires, automotive LED headlights, and offline AC-DC LED drivers.

Quick reference


Input Supply Voltage (`VIN`)	9.0 V to 250.0 V DC (Internal high-voltage bias regulator)
MOSFET Gate Drive (`GATE`)	$1.0\text{ A}$ peak source/sink current gate driver
Topologies Supported	Buck, Boost, SEPIC, Buck-Boost
Control Scheme	Closed-Loop Peak Current-Mode Control
Dimming Capabilities	True DC Analog Dimming (`LD` pin) & High-Contrast PWM Dimming (`PWM_D` pin)
Protection Features	Closed-loop Over-Voltage Protection (OVP), Output Short-Circuit Protection
Package	16-lead SOIC / 24-lead QFN

Pinout (SOIC-16 Package)

text

             ┌───┴───┐
        VDD 1│ 1   16│ VIN (+9V to +250V)
       GATE 2│       │15 NC
        GND 3│ HV9911│14 OVP (Over-Voltage Sense)
         CS 4│       │13 FDBK (Closed-Loop Feedback)
       COMP 5│       │12 PWMD (PWM Dimming Input)
         LD 6│       │11 REF (Internal Reference)
        RT 7│       │10 SYNC
       VDD 8│       │9  AVDD
             └───────┘

Pin	Name	Type	Description
1, 8	`VDD`	Power	Internal $7.7\text{V}$ Gate Drive Regulator Output
2	`GATE`	Output	External N-Channel MOSFET Gate Drive Output ( $1.0\text{A}$ peak)
3	`GND`	Power	Power Ground Reference
4	`CS`	Input	Peak Current Sense Input
5	`COMP`	Output	Error Amplifier Compensation Node
6	`LD`	Input	Linear Analog Dimming Input ( $0.2\text{V} \dots 1.5\text{V}$ )
7	`RT`	Input	Switching Frequency Programming Resistor Pin
10	`SYNC`	Input	External Clock Synchronization Input
11	`REF`	Output	Internal $1.25\text{V}$ Precision Reference Voltage Output
12	`PWMD`	Input	PWM Dimming Logic Input (High = Enable output switch; Low = Disable)
13	`FDBK`	Input	Output Current Closed-Loop Feedback Input
14	`OVP`	Input	Over-Voltage Protection Input
16	`VIN`	Power	High-Voltage Input Supply (+9.0V to +250.0V DC)

High-Voltage Safety Warning

Caution

High Voltage Hazard! The HV9911 operates directly from high-voltage DC rails up to $250\text{V}$ DC. Dangerous shock hazards exist across external N-FET drains, inductors, and LED string terminals. Exercise extreme caution during breadboarding and PCB debugging.

Common mistakes

Leaving PWMD (Pin 12) un-connected: PWMD logic input enables/disables the external MOSFET gate driver. Pull PWMD HIGH to REF (Pin 11) for continuous non-dimmed operation.
Inadequate decoupling on VDD (Pins 1 & 8): The internal $7.7\text{V}$ LDO powers the 1A gate driver. Decouple VDD pins with a low-ESR $1.0\ \mu\text{F} \dots 4.7\ \mu\text{F}$ ceramic capacitor directly to GND.

Notes

HV9911 vs HV9910B: HV9910B uses open-loop current control; HV9911 uses closed-loop current control with a 1A gate driver, delivering superior LED current regulation accuracy over varying supply voltages.