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
15
MSL2023/2024 [DATASHEET]
42063A–LED–02/2013
NC 7, 17 7, 17
No internal connection
PWM2 – 8
PWM2 Dimming Input
Drive PWM2 with a pulse-width modulated signal to control LED brightness of the color-adjust string.
See “PWM and LED Brightness” on page 24 for details.
REXT 9 9
External Resistor
Connect a 46.4k, 1% resistor from REXT to AGND.
TOFF 10 10
Off-Time Set Input
A resistor from TOFF to AGND controls the constant off time for the color-adjust string floating buck
converter, where R
TOFF
= t
OFF
* (90.9 x 10
9
), with t
OFF
in seconds and R
TOFF
in Ohms. For example, an
off time of 0.5µs results in a resistor value of 45.3k (to the nearest 1% value).
DNC 11 11
Do Not Connect
Do not make external connection to DNC.
CS 13 13
Current Sense Input for the Color-Adjust String
Connect CS to the external current sense resistor of the color-adjust string. The default current sense
threshold is 200mV.
PGND 14 14
Power Ground
PGND is the ground connection for the FET gate drivers. Connect PGND to AGND close to the
MSL2023/2024.
DRV 15 15
Gate Drive for Color-Adjust (Floating Buck Regulator) MOSFET
Connect DRV to the gate of the external power MOSFET.
PVIN 16 16
Power Voltage Input (12V Nominal)
PVIN powers DRV, the floating buck FET gate driver. Bypass PVIN to PGND with a 1.0µF or greater
capacitor.
S 18 18
Source Sense Input for Main LED String MOSFET
Connect S to the source of the external MOSFET, and to the current sense resistor for the main LED
string. The current sense threshold is 200mV.
G 19 19
Gate Output for Main String MOSFET
Connect G to the gate of the Main string external MOSFET.
D 20 20
Drain Output for Main String MOSFET
Connect D to the drain of the main string external MOSFET.
AVIN 21 21
Analog Voltage Input (12V Nominal)
AVIN is the power input to the MSL2023/2024. Bypass AVIN to AGND with a 1.0µF or greater
capacitor placed close to AVIN.
VCC 22 22
5V Internal Voltage
Connect 10uF bypass capacitor from VCC to AGND.
Name
Pin
DescriptionMSL2023 MSL2024