Datasheet
Table Of Contents
- Features
- Typical Applications
- 1. Introduction
- 2. Ordering Information
- 3. Application Circuit
- 4. Absolute Maximum Ratings
- 5. Electrical Characteristics
- 6. Block Diagram
- 7. Pinout and Pin Description
- 8. Typical Application Circuit
- 9. Detailed Description
- 10. Fault Conditions
- 11. Applications Information
- 12. Control Registers
- 13. Detailed Register Descriptions
- 13.1 RAM (0x00 through 0x1F)
- 13.2 Main String Reference Voltage register (MREF, 0x20)
- 13.3 Color-Adjust String Reference Voltage register (CAREF, 0x21)
- 13.4 Fault Disable register (FAULT, 0x22)
- 13.5 Fault Status register (FAULTSTAT, 0x23), Read Only
- 13.6 Sleep register (SLEEP, 0x24)
- 13.7 Main String Duty Cycle register, High Byte (MDUTYHIGH, 0x34)
- 13.8 Main String Duty Cycle register, Low Byte (MDUTYLOW, 0x35)
- 13.9 Color Adjust String Duty Cycle register, High Byte (CADUTYHIGH, 0x36)
- 13.10 Color Adjust String Duty Cycle register, Low Byte (CADUTYLOW, 0x37)
- 13.11 Efficiency Optimizer Control Register (EOCTRL, 0x40)
- 13.12 Registers 0x60 and 0x61, EEPROM Access
- 14. I²C Serial Interface
- 15. Packaging Information
- 16. Datasheet Revision History
- Table of Contents
2
MSL2023/2024 [DATASHEET]
42063A–LED–02/2013
1. Introduction
The MSL2023/24 LED drivers for two-color systems include a linear current controller for the main string, typically for
white LEDs, and a second floating buck controller for a color-adjust LED string. Both the switching and linear controllers
drive external MOSFETs to provide flexibility over a wide range of power levels (LED currents and voltages).
The MSL2023/24 adaptively manage the voltage powering the main LED string. A proprietary and patent pending
efficiency optimizer algorithm controls the voltage output of any AC/DC or DC/DC isolated or non-isolated topology,
including ultra-low bandwidth single-stage PFC flyback controller.
The MSL2023/24 feature peak current control and individual string PWM dimming. The MSL2023 features individual,
register controlled, 180° out of phase PWM dimming at 400Hz. The MSL2024 offers individual string PWM inputs.
The MSL2023/24 operate from a 9.5V to 15V power supply. The Main LED string is driven by a high accuracy, ripple free
linear current controller. The color-adjust string voltage regulation loop uses a constant off-time control algorithm to
achieve stable control with good transient behavior. For flexibility of design, off-time is set using an external resistor. LED
current in both strings can be adjusted using internal 8-bit DACs.
The MSL2023/24 are available in space-saving 24-pin 4x4mm QFN package and operate over the extended -40°C to
105°C operating range.
2. Ordering Information
Note: 1. Lead-Free, Halogen-Free, RoHS Compliant Package
3. Application Circuit
Ordering code Description Package
(1)
MSL2023IN Two String LED Driver 4 x 4mm 24-pin QFN
MSL2024IN Two String LED Driver 4 x 4mm 24-pin QFN
SINGLE
STAGE
PFC
FLYBACK
CONTROLLER
FBO
A
C MAINS
WHITE LED STRING COLOR LED STRING
BRIDGE
RECTIFIER
&
EMI
FILTER
D
G
S
DRV
CS
MSL2024
LED
DRIVER
LINEAR
LED
DRIVER
MCU
FLOATING
BUCK LED
DRIVER
PWM1 PWM2
VDD
V
IN