MIC3232YMM Microchip

MIC3230/1/2 Constant Current Boost Controller for Driving High Power LEDs General Description The MIC3230/1/2 are constant current boost switching controllers specifically designed to power one or more Bringing the Power to Light strings of high power LEDs. The MIC3230/1/2 have an Features input voltage range from 6V to 45V and are ideal for a variety of solid state lighting applications. 6V to 45V input supply range The MIC3230/1/2 utilizes an external power device which Capable of driving up to 70W offers a cost conscious solution for high power LED Ultra low EMI via dithering on the MIC3231 applications. The powerful drive circuitry can deliver up to Programmable LED drive current 70W to the LED system. Power consumption has been minimized through the implementation of a 250mV Feedback voltage = 250mV 3% feedback voltage reference providing an accuracy of 3%. Programmable switching frequency (MIC3230/1) or The MIC323x family is dimmable via a pulse width 400kHz fixed frequency operation (MIC3232) modulated (PWM) input signal and also features an enable PWM Dimming and separate enable shutdown pin for low power shutdown. Frequency synchronization with other MIC3230s Multiple MIC3230 ICs can be synchronized to a common Protection features: operating frequency. The clocks of these synchronized Over Voltage Protection (OVP) devices can be used together in order to help reduce noise and errors in a system. Over temperature protection Under-voltage Lock-out (UVLO) An external resistor sets the adjustable switching frequency of the MIC3230/1. The switching frequency can Packages: be between 100kHz and1MHz. Setting the switching N/C 1 16 N/C VIN 2 15 VDD frequency provides the mechanism by which a design can VIN 1 12 VDD VIN 1 10 VDD EN 3 14 DRV be optimized for efficiency (performance) and size of the EN 2 11 DRV EN 2 9 DRV PWMD 4 13 PGND PWMD 3 10 PGND PWMD 3 8 PGND external components (cost). The MIC323x family of LED COMP 5 12 OVP COMP 4 9 OVP COMP 4 7 OVP IADJ 6 11 IS IADJ 5 8 IS drivers also offer the following protection features: Over IADJ 5 6 IS FS 7 10 SYNC/NC FS 6 EPAD 7 SYNC/NC EPAD voltage protection (OVP), thermal shutdown and under- AGND 8 9 N/C voltage lock-out (UVLO). MIC3232 MIC3230/1 MIC3230/1 The MIC3231 offers a dither feature to assist in the 10-pin MSOP 12-pin MLF 16-pin TSSOP reduction of EMI. This is particularly useful in sensitive EMI applications, and provides for a reduction or emissions by 40C to +125C junction temperature range approximately 10dB. The MIC3232 is a 400kHz fixed frequency device offered in a small 10-pin MSOP package. The MIC3230/1 are Applications offered in both the EPAD 16-pin TSSOP package and the Street lighting 12-pin 3mm 3mm MLF package. Solid state lighting Datasheets and support documentation can be found on General illumination Micrels web site at: www.micrel.com. Architectural lighting Constant current power supplies Bringing the Power to Light is a trademark of Micrel, Inc. MicroLeadFrame and MLF are registered trademarks of Amkor Technology. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC3230/1/2 Typical Application L D1 47H VIN VOUT CIN 4.7F/50v R8 VIN R2 100k 100k COUT LED 1 ENABLE EN OVP 4.7F 100V PWMD PWMD Synch to other MIC3230 SYNC DRV Q1 LED X MIC3230/31 R9 ILED Return FS 4.33k RSLC 51 COMP IS RCS V = 0.25V FB RFS VDD IADJ 16.5k CCOMP 1/2W 10nF C3 RADJ 10F AGND PGND 10V EPAD 1/4W Analog ground Power ground Figure 1. Typical Application of the MIC3230 LED Driver Product Option Matrix MIC3230 MIC3231 MIC3232 Input Voltage 6V to 45V 6V to 45V 6V to 45V Synchronization Yes No No Dither No Yes No Frequency Range Adj from 100kHz to 1MHz Adj from 100kHz to 1MHz Fixed Freq. = 400kHz 16-pin EPAD TSSOP 16-pin EPAD TSSOP Package 10-pin MSOP 12-pin 3mm 3mm MLF 12-pin 3mm 3mm MLF Ordering Information Part Number Temperature Range Package Lead Finish MIC3230YTSE 40 to +125C 16-pin EPAD TSSOP Pb-Free MIC3230YML 40 to +125C 12-pin 3mm x 3mm MLF Pb-Free MIC3231YTSE 40 to +125C 16-pin EPAD TSSOP Pb-Free MIC3231YML 40 to +125C 12-pin 3mm x 3mm MLF Pb-Free MIC3232YMM 40 to +125C 10-pin MSOP Pb-Free M9999-030311-D March 2011 2