MIC4102 Evaluation Board MIC4102 Gate Driver Evaluation Board General Description Precautions This evaluation board provides a platform for evaluating the MIC4102 Power MOSFET driver. The MIC4102 is a high voltage synchronous gate driver controlled by a single input signal and is housed in an SOIC-8L package. The MIC4102 operates from VDD of 6 to 16 V while the switch and high side node operates up to 118V. The Driver can be used in a variety of topologies. This evaluation board is configured as an open loop buck converter operating in continuous conduction mode (CCM) or discontinuous conduction mode (DCM). The duty cycle D is determined by the input PWM signal. The internal circuitry of the MIC4102 generates delays between transitions to prevent shoot-through currents. The MIC4102 bias supply VDD is separate from the power stage Vin. The high side driver is powered by an external bootstrap capacitor CB and an internal bootstrap diode. No external bootstrap diode is required. The CB cap is charged by VDD during when the low side MOSFET is on. Although the 4102 can operate up to 118V this evaluation board was designed with parts rated at 100V maximum. Operation of the evaluation board less to than 90Vin is recommended. These limitations are for the evaluation board only and not for the Mic4102. The output voltage is dependent on the duty cycle of the PWM and the input voltage. Vout =Vin(Ton/T) (CCM only). T is the period of the input PWM pulse and the on time is when the high side FET Q1 is on and the off time is when the low side FET Q2 is on. The operating conditions need to be within limits to keep the inductor L1 from saturating. It is important to keep IL_pk below I_sat Specifications (evaluation board only) • • • • • Recommended operating input voltage Vin ….12-90V Recommended operating input VDD…………..12V Recommended operating frequency…200khz-500khz Maximum input Vin Voltage……………………..90V Maximum input VDD voltage…………………….16V Requirements IL _ pk = Iout + IL _ pk = (Vin − Vout )DT < I _ sat 2L (Vin − Vout )DT < I _ sat L For CCM For DCM Where; D=Ton/T, T=1/F, L=L1, I_sat is the saturating current of L1. Table 1 lists a set of safe operating parameters. Additional power FETs may be installed on the back for higher voltages. Ordering Information Part Number Description MIC4102YM-EV MIC4102 Gate Driver Evaluation Board The MIC4102 evaluation board requires an input voltage for VDD and a Vin voltage for the power stage. The output may be loaded with a resistive or and active load. The active load can be set for constant current or constant resistance. 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Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com June 2009 M9999-061809 Micrel MIC4102 Evaluation Board Some safe operating conditions VIN (V) VOUT (V) 12 12 12 24 24 24 48 48 48 48 48 48 60 60 60 80 90 3.3 3.3 3.3 5 5 5 12 12 12 24 24 24 12 12 12 12 12 Freq (hz) 100k 200k 400k 100k 200k 400k 300k 400k 500k 300k 400k 500k 300k 400k 500k 400k 400k IOUT (A) IIN(A)(ave) Duty Mode IL_pk IL_sat 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 2.0 A 0.55 0.55 0.55 0.42 0.42 0.42 0.56 0.56 0.56 1 1 1 0.42 0.42 0.42 0.37 0.33 .29% .29% .29% .22% .22% .22% .26% .26% .26% .56% .56% .56% .21% .21% .21% .12% .15% CCM CCM CCM CCM CCM CCM CCM CCM CCM CCM CCM CCM CCM CCM CCM CCM CCM 3.3 A 2.6 A 2.3 A 3.0 A 4.1 A 4.1 A 3.6 A 3.2 A 3 4.2 A 3.7 A 3.3 A 3.8 A 3.4 A 3.1 A 3.4 A 3.4 A 4.4A 4.4A 4.4A 4.4A 4.4A 2.5A 4.4A 4.4A 4.4A 4.4A 4.4A 4.4A 4.4A 4.4A 4.4A 4.4A 4.4A L is 10uh, Sumida # CDRH104R-100 Table 1. Set of safe operating parameters PCB Layout Top June 2009 Bottom 2 M9999-061809 Micrel MIC4102 Evaluation Board Figure1. Schematic Diagram June 2009 3 M9999-061809 Micrel MIC4102 Evaluation Board Bill of Materials Item U1 Q1,Q2 Q1A,Q2A C1, C2 C3,C6 C4,C5 C7 D1 L1 J1-J9 Part Number MIC4102YM Si4484EY VJ0603Y104KXXAT GRM31CR72A105KA01L EKA00DD310L00K 038RSU VJ0805X222KXABT SS2PHH10-E3 CDRH104R-100 2551-2-00-01-00-00-07-0 Manufacturer Micrel.Inc Vishay/Siliconix Vishay/Siliconix Vishay BC muRata Vishay Description Buck controller 100V N-channel MOSFET open location for D2PAK FETs 0.1uf/50V, X7R ceramic cap 0603 size 1uF, 100V, ceramic, X7R,1206 100uF Cap, 100v Aluminium Vishay Vishay General Sumida MilMax 2200pf/100V,0805 2A,100V, High voltage Schottky Diode, 10uH Inductor Turret Pins Qty. 1 2 0 2 2 2 OR 1 1 1 8 Notes: Micrel Semiconductor tel: 408-944-0800 Vishay Corp. tel: 206-452-5664 Diodes, Inc. tel: 805-446-4800 muRata tel: 800-831-9172 Sumida tel: 408-321-9660 AVX tel: 843-448-9411 TDK tel: 847-803-6100 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2006 Micrel, Incorporated. June 2009 4 M9999-061809