The SM645/646/647 series of Power Output Stages are especially designed to be driven with standard PWM integrated circuits to form an efficient switching power supply. The SM645, SM646 and SM647 are optimized for non-isolated Buck and Buck-Boost application. The hybrid circuit construction utilizes thick film resistors on a beryllia substrate for maximum thermal conductivity and resultant low thermal impedance. All of the active elements in the hybrid are fully passivated.
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· Equivalent to the Unitrode PIC 645, 646, 647· 15A current capability· Cost saving design reduces size, improves efficiency, reduces noise and RFI· High operating frequency (to > 100KHz) results in smaller inductor-capacitor filter and improved power supply response time· High operating efficiency at 7A typical performance - Rise and fall time < 300ns Efficiency > 85%
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SM645 SM646 SM647
Input Voltage, V4 - 2 ......................................... 60V 80V 100V
Output Voltage, V1 - 2 ...................................... 60v 80v 100V
Drive Input Reverse Voltage, V3 - 4 ................ 5V 5V 5V
Continuous Output Current, I1 ....................... 15A 15A 15A
Peak Output Current ..................................... 20A 20A 20A
Drive Current, I3 ......................................... -0.4A -0.4A -0.4A
Thermal Resistance
Power Switch, qJ - C ...................................................2.0/W
Commutating Diode ....................................................2.0/W
Case to Ambient, qC - A ............................................30.0/W
Operating Junction Temperature
Hermetic (K Package) .....................................................150
Storage Temperature Range ............................ .-65 to 150
Lead Temperature (Soldering, 10 Seconds) ......................300
Post a Buying Lead
Required Field 
