PowerBench Programmable Power Supply Final presentation – part A March 20 th, 2009 Gregory Kaplan Dmitry Babin Supervisor: Boaz Mizrahi

Project Overview A versatile power supply unit with multiple outputs for laboratory use and testing of various electronic devices.

Key features Programmable source/sink/meter operation Programmable source/sink/meter operation Up to 4 independent channels Up to 4 independent channels Two-way communication with a PC Two-way communication with a PC Portable design Portable design Modularity Modularity

Portability features Compact and lightweight case Compact and lightweight case USB interface USB interface Sink and meter functions can operate from battery power Sink and meter functions can operate from battery power

Modular design Configuration can be selected according to client needs: Configuration can be selected according to client needs: –2 or 4 channels (with or w/o negative channel) –USB2.0 FS (12Mbit/s) or HS (480Mbit/s) –FPGA upgrade path exists –Can function without battery

High-level overview Active load Power supply Control unit User interface for standalone operation LCDKeysLEDs DUTDUT Measurement unit

Specifications Source operation Source operation –Output voltage: 0.9 to 12.6 V –Output current: 0 to 3.5 A –Programming resolution: < 5 mV –Ripple and noise: < 20 mV peak-to-peak –Settling time: < 1 ms –Programmable current limits Load operation Load operation –Input current: 0 to 3.5 A –Programming resolution: < 5 mA –Settling time: < 0.5 µs Meter capabilities Meter capabilities –Bipolar voltage precision: < 5 mV (5 MHz bandwidth) –Bidirectional current precision: < 5 mA (1 MHz bandwidth)

Expected performance – LDO An example of the simulated transient response of the LDO circuit is shown below: An example of the simulated transient response of the LDO circuit is shown below: –Output voltage step: 1V to 12.6V (with load current of 3.5A) –DUT input capacitance: 0μF, 10μF, 100μF, 1000μF –Lead inductance of 0.5μH and lead+contact resistance of 100mΩ (each lead) –Worst-case overshoot: ~ 120mV (~ 1%) –Settling time: <1ms to within 5mV

Expected performance – load An example of the simulated transient response of the active load circuit is shown below: An example of the simulated transient response of the active load circuit is shown below: –Load current step: 1A with a rise/fall time of 500ns (2MHz) –DUT voltage: 12.6V –Overshoot: 95mA –Settling time: 300ns to within 5% –Assumed lead inductance of 0.5uH and lead+contact resistance of 150mOhm

Current status 1 st board (“digital”): 1 st board (“digital”): Local power supplies Local power supplies USB comm. using chip vendor’s software USB comm. using chip vendor’s software MCU in-circuit programming MCU in-circuit programming FPGA configuration through JTAG and from the on-board SPI FLASH FPGA configuration through JTAG and from the on-board SPI FLASH Simple test firmware runs in all 3 chips Simple test firmware runs in all 3 chips  Misc. periphery to be tested: − Temperature monitoring chip − Real-time clock

Current status 2 nd board (“analog”): 2 nd board (“analog”):  Assembled and will be tested as soon as sufficient firmware support is available

Current status 3 rd board (“panel”): 3 rd board (“panel”): Basic features not requiring firmware support Basic features not requiring firmware support  More thorough tests will be done as soon as sufficient firmware support is available

Short-term roadmap Establish a stable and comfortable working environment: Establish a stable and comfortable working environment: –(Re)program any chip directly from PC (in progress) –Use the LCD and keyboard as a debug console Start development of the functional firmware and software, and use it to test the “analog” board Start development of the functional firmware and software, and use it to test the “analog” board

Questions ?¿?¿?¿?¿

Statistics 1 project 2 partners 3 boards 17 months ~60 breakfasts at Zoran 129 different electronic components 612 Mb in project folder 996 nets 1221 total parts ~2200 man-hours 4017 solder pads