Datasheet

i
MSL2021 [DATASHEET]
42062A–LED–02/2013
Table of Contents
Features 1
Typical Applications 1
1. Introduction 2
2. Ordering Information 2
3. Application Circuit 2
4. Absolute Maximum Ratings 3
5. Electrical Characteristics 4
6. Block Diagram 11
7. Pinout and Pin Description 12
7.1 Pinout MSL2021 12
7.2 Pin Descriptions 12
8. Typical Application Circuit 14
9. Detailed Description 14
10. Fault Conditions 15
11. Applications Information 15
11.1 Turn-On Sequence 15
11.2 Setting the Main String Current with RS 15
11.3 Setting AC/DC Output Voltage 16
11.4 Selecting the Main String MOSFET 16
11.5 Selecting the Drain Resistor – RD 16
11.6 Selecting the Color-Adjust String Floating Buck Components 17
11.7 PWM and LED Brightness 20
11.8 Light Color and the THM Input 20
11.9 MSL2021 Look-Up Table Lockout Procedure 23
11.9.1 Example: 23
12. Control Registers 25
12.1 EEPROM and Power-Up Defaults 26
12.2 EEPROM Address and Control/Status Registers 26
13. Detailed Register Descriptions 27
13.1 String Duty Cycle Control Registers (SDCR18 through SDCR80, 0x00 through 0x1F) 27
13.2 Main String Reference Voltage register (MREF, 0x20) 27
13.3 Color-Adjust String Reference Voltage register (CAREF, 0x21) 28
13.4 Fault Disable register (FAULT, 0x22) 28
13.5 Fault Status register (FAULTSTAT, 0x23), Read Only 29
13.6 Sleep register (SLEEP, 0x24) 29
13.7 Thermistor Temperature register (TEMP, 0x31), Read Only 29
13.8 Password Verification registers
(PWV(HIGH) and PWV(LOW), 0x38 and 0x39) 30
13.9 Look-Up Table Lock register (LUT LOCK, 0x3A) 30