MBI6001 — High-Voltage Constant-Current AC Mains LED Driver

Overview

The MBI6001 (MBI6001-N1N) is an offline high-voltage constant-current LED driver IC manufactured by Macroblock. Designed specifically for mains-powered LED lighting fixtures (such as GU10/E27 LED bulbs, T8 LED tubes, downlights, and architectural LED strips), it operates directly from rectified AC mains power.

Handling input DC voltages up to $500\text{ Volts}$ (from rectified $85\text{V} \dots 265\text{V}$ AC mains), the MBI6001 delivers constant current outputs up to $350\text{ mA}$ with high electrical efficiency ( $> 90\%$ ). Output current is set precisely using an external current sense resistor ( $R_{EXT}$ ).

Quick reference


Input DC Voltage Limit (`HV`)	Up to $500\text{ V}$ DC
AC Mains Input Range	$85\text{ V}$ to $265\text{ V}$ AC (50/60 Hz)
Output Current Capability	Adjustable up to $350\text{ mA}$ (Set by external resistor $R_{EXT}$ )
System Efficiency	$> 90\%$ typical
Protection Features	Thermal Foldback, Open-LED Protection, Short-LED Protection
Dimming	Compatible with TRIAC line-voltage dimmers and PWM dimming inputs
Package	8-pin SOP / DIP-8

Pinout (SOP-8 Package)

text

             ┌───┴───┐
        GND 1│ 1   8 │ HV (High Voltage Input up to 500V)
       REXT 2│       │ 7 NC
        PWM 3│MBI6001│ 6 DRAIN (Internal Power MOSFET Drain)
       VDD  4│       │ 5 CS (Current Sense Input)
             └───────┘

Pin	Name	Type	Description
1	`GND`	Power	Ground reference (0 V)
2	`REXT`	Input	Constant Current Programming Pin (Connect resistor $R_{EXT}$ to GND)
3	`PWM`	Input	PWM Dimming Control Input (Pull HIGH for 100% brightness)
4	`VDD`	Power	Internal Low Voltage Supply Output
5	`CS`	Input	Peak Current Sense Input
6	`DRAIN`	Output	Internal High-Voltage Power MOSFET Drain Connection
7	`NC`	Unused	No Connection (High-voltage clearance pin)
8	`HV`	Power	High-Voltage Rectified DC Input (+100V to +500V DC)

Output Current Formula

The output constant current ( $I_{OUT}$ ) is programmed via external resistor $R_{EXT}$ connected to Pin 2:

$I_{OUT} = \frac{V_{REXT}}{R_{EXT}} \times K_I \approx \frac{1.20\text{V}}{R_{EXT}} \times 250$

Safety & High-Voltage Warning

Caution

High Voltage Danger! Circuits utilizing the MBI6001 connect directly to non-isolated $120\text{V} / 230\text{V}$ AC Mains voltage. Touching any portion of the PCB while powered poses severe electrical shock hazards. Always use an isolation transformer and protective enclosures during testing.

Common mistakes

Omitting input EMI filter and surge varistor: Rectified mains spikes easily exceed $500\text{V}$ during power-on transients. Always include a MOV (metal oxide varistor) and EMI choke at the AC input.

Notes

MBI6001 vs HV9910: MBI6001 incorporates internal thermal foldback protection that automatically reduces current if the LED heatsink temperature exceeds safe thresholds.