High Current V-I Circuits (Parallel Outputs and Bridge Circuits) Tim Green, Art Kay, John Brown

High Power V-I Circuit Applications Power Packages Parallel Outputs for Higher Current V-I Using External Shunt V-I Using Internal Shunt (Burr-Brown Exclusive) Bridge Tied Load Constant Current PWM Driver

Power Operational Amplifier Packages OPA569 HSOP-20 OPA567 QFN-12 5x5mm DRV104 SO-14 DRV103 SO-8 OPA561 HTSSOP-20 LOG114 QFN-16 4x4mm OPA548 TO-220-7 OPA549 ZIP-11 3584 TO-3 (History) OPA548 DDPAK-7 OPA569 & OPA564 Bottom Pwr Pad OPA564 HSOP-20 Top Pwr Pad

Power Operational Amplifier Packages OPA569 OPA567 QFN 12-pin Chip Cap QFN-28-pin SON-8-pin SSOP 20-pin

Power Amplifier OPA567, 569, 561 & DRV103, 104 Adapter Boards Available From Tucson Here’s 2 of Them

Paralleling Outputs for More Drive Current Power Op Amps Paralleling Outputs for More Drive Current

OPA548 Power Op Amp Application Paralleling for More Output Current +8V to 60V Total Supply NOTES: (1) Works well for G < 10. Input offset causes output current to flow between amplifiers with G > 10. Gains (resistor ratios) of the two amplifiers should be carefully matched to ensure equal current sharing. (2) As configured (ILIM connected to V–) output current limit is set to 10A (peak). Each amplifier is limited to 5A (peak). Other current limit values may be obtained, see Figure 3, “Adjustable Current Limit”. 6A continuous 3A cont 3A cont Output Swing to Rail Spec with 3A Load (V+) – 4.1V (V–) + 3.7V

OPA569 Power Op Amp Application Paralleling for More Output Current +2.7V to 5.5V Total Supply 2A cont Vos is Averaged and BW, SR are That of One Amplifier 4A continuous 2A cont Output Swing to Rail with 2A Load (V+) – 0.3V (V–) + 0.3V

Bridge Tied Load for Floating Output Power Op Amps Bridge Tied Load for Floating Output

OPA549 Power Op Amp Application Bridge => 2x Voltage & 4x Power Out High Power TEC, up to 8A Neil Albaugh Circuit Simulation +24V +24V  5V VTEC = 14V  5V Physical Contact With a Circuit Output Swing to Rail with 8A Load (V+) – 4.8V (V–) + 4.6V Won’t Swing Very Close to Supply Rail but Drives 8A Out

Physical Contact With a Circuit Only IC in Industry That Does This!!! OPA569 Power Op Amp Application Bridge => 2x Voltage & 4x Power Out High Power TEC, up to 2A  300mV Can be 3V Can be 3V Physical Contact With a Circuit Usually +2.5V Output Needs to Swing Close to Supply Rail Only IC in Industry That Does This!!!

Designing Power Current Sources External Shunt Resistor Feedback using External Shunt Resistor

OPA541 Power Op Amp Application Howland Power Current Source Rtrim 1Ω RS 1Ω Transfer Function 500mA out per 10V in = 50mA per Volt I VRL

OPA541 Power Op Amp Application Howland Power Current Source Transfer Function 600mA out per 10V in = 60mA per Volt

OPA541 Power Op Amp Application Howland Power Current Source

OPA569 Power Op Amp Application -5V Single Supply with +Vin Constant Current Using Ext ISHUNT Feedback Power Current Source Grounded Anode

OPA569 Power Op Amp Application -5V Single Supply with +Vin Grounded Anode LED Driver Scope Photo Plus Voltage +1V Input Signal 0V 0V Vout, 10 ohm Load Minus Voltage -1.25V LED Off 0V Vout, LED Load -2. 25V LED On

OPA569 Power Op Amp Application -5V Single Supply with +Vin Grounded Anode LED Driver Scope Photo Plus Voltage +1V Input Signal 0V 0V Vout, 10 ohm Load Minus Voltage -1.25V 50sec Fall LED Off 0V Feedback Cap 0.0033uF Turn-On Step Response Vout, LED Load LED On -2. 25V 40sec Fall

OPA569 Power Op Amp Application -5V Single Supply with +Vin Grounded Anode LED Driver Scope Photo Plus Voltage +1V Input Signal 0V 0V Vout, 10 ohm Load 100sec Rise Minus Voltage -1.25V LED Off 0V Turn-Off Step Response Feedback Cap 0.0033uF Vout, LED Load 15msec Rise Slow LED On -2. 25V

OPA569 Power Op Amp Application -5V Single Supply with +Vin Grounded Anode LED Driver Scope Photo Plus Voltage +1V Input Signal 0V 0V 12sec Fall Minus Voltage Vout, 10 ohm Load -1.25V LED Off 0V Turn-On Step Response No Feedback Cap Vout, LED Load 12sec Fall -2. 25V LED On

OPA569 Power Op Amp Application -5V Single Supply with +Vin Grounded Anode LED Driver Scope Photo Plus Voltage +1V Input Signal 0V 0V Vout, 10 ohm Load 12sec Rise Minus Voltage -1.25V LED Off 0V Turn-Off Step Response No Feedback Cap Vout, LED Load 1.5msec Rise Slow LED On -2. 25V

OPA569 Power Op Amp Application -5V Single Supply with +Vin Grounded Anode LED Driver Scope Photo Plus Voltage +1V Input Signal 0V 0V Minus Voltage -1.25V Vout, 10 ohm Load 0V LED Off Vout, LED Load -2.25V LED On

Designing Power Current Sources Internal Current Monitor Feedback using Internal Current Monitor (Instead of External Shunt Resistor)

OPA569 Power Op Amp Application 2.5V Bipolar Supplies with -Vin Constant Current Using IMONITOR Feedback Feedback Through IMONTIOR 4.2k Vin- Io is Independent of changes in Rload (LED aging). +2.5V R1 +2.5V -2.5V 12 13 IMONTIOR = (1/475 x Io) 5 - 9 Iin = 2.5V / 4.2k =  0.6mA 14 15 Io Constant Current OPA569 Vo pin Io = Iin x 475 Io = (Vin / Rin) x 475 = 285mA 6 3 + RSET +2.5V 17 18 33k 350mA Power Current Source -2.5V -2.5V Luxeon Star-0 High Power LED on Heat Sink Grounded Cathode

OPA569 Power Op Amp Application 2 OPA569 Power Op Amp Application 2.5V Bipolar Supplies with -Vin Grounded Cathode LED Driver Scope Photo +2.5V Input Signal -2.5V +2.5V Vout, 10 ohm Load -2.5V +2.5V Vout, LED Load LED Off LED On -2.5V

OPA569 Power Op Amp Application 2 OPA569 Power Op Amp Application 2.5V Bipolar Supplies with -Vin Grounded Cathode LED Driver Scope Photo +2.5V Input Signal -2.5V +2.5V Vout, 10 ohm Load -2.5V LED On LED Off +2.5V Vout, LED Load -2.5V

OPA569 Power Op Amp Application +5V Single Supply with +Vin Constant Current Using IMONITOR Feedback Feedback Through IMONTIOR Io is Independent of changes in Rload (LED aging) and +5V. 1,500pF 4.2k Vin- +5V +5V R1 IMONTIOR = (1/475 x Io) +5V VLED 0V 12 13 +2.5V 0V +5V Iin = +2.5V / 4.2k = +0.6mA 5 - 9 14 15 Io Constant Current Io = Iin x 475 Io = (Vin / Rin) x 475 = 285mA OPA569 10k Vo pin Vout 6 3 +2.5V + +2.5V RSET 0V 17 18 33k 350mA Power Current Source 10k Luxeon Star-0 High Power LED on Heat Sink Use REF3025 to make independent of +5V. +5V to Anode

OPA569 Power Op Amp Application +5V Single Supply with +Vin +5V to Anode LED Driver Scope Photo +5V Input Signal 0V +5V Vout, 10 ohm Load Oscillations Without Feedback Capacitor +2.5V 0V +5V LED Off Vout, LED Load Biased for Signal Symmetry +2.5V LED On 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin +5V to Anode LED Driver Scope Photo +5V Input Signal 0V +5V Vout, 10 ohm Load Clean With Feedback Capacitor +2.5V 0V +5V LED Off Vout, LED Load Biased for Signal Symmetry +2.5V LED On 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin +5V to Anode LED Driver Scope Photo +5V Input Signal 0V +5V 25sec Fall Vout, 10 ohm Load Turn-On Step Response +2.5V 0V +5V 15sec Fall LED Off Vout, LED Load Biased for Signal Symmetry +2.5V 35sec Delay LED On Charging Internal Gate Cap 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin +5V to Anode LED Driver Scope Photo +5V Input Signal 0V +5V 4sec Rise Vout, 10 ohm Load +2.5V 0V +5V LED Off Turn-Off Step Response Vout, LED Load 5sec Rise Biased for Signal Symmetry +2.5V LED On 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin +5V to Anode LED Driver Scope Photo +5V Input Signal 0V +5V Vout, 10 ohm Load Oscillations Without Feedback Capacitor +2.5V 0V +5V Vout, LED Load LED Off +3.6V Biased for Signal Symmetry +2.5V LED On 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin +5V to Anode LED Driver Scope Photo +5V Input Signal 0V +5V Vout, 10 ohm Load Clean With Feedback Capacitor +2.5V 0V +5V Vout, LED Load LED Off +3.6V Biased for Signal Symmetry +2.5V LED On 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin +5V to Anode LED Driver Scope Photo +5V Input Signal +2.5V 0V +5V Vout, 10 ohm Load +2.5V 0V Vout, LED Load LED Off +3.6V Biased Up for Min LED off time +2.5V LED On 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin Constant Current Using IMONITOR Feedback Feedback Through IMONTIOR Io is Independent of changes in Rload (LED aging) and +5V. 1,500pF 4.2k +0.25V R1 IMONTIOR = (1/475 x Io) +5V 12 13 Iin = +2.5V / 4.2k = +0.6mA 5 - 9 Io = Iin x 475 Io = (Vin / Rin) x 475 = 285mA 14 15 Io Constant Current OPA569 Vo pin Vout Vin+ 6 3 +2.5V + +2.75V RSET 0V 17 18 +0.25V 33k 350mA Power Current Source +0.25V offset is used to maintain min voltage on IMONITOR Current Source Luxeon Star-0 High Power LED on Heat Sink Grounded Cathode

OPA569 Power Op Amp Application +5V Single Supply with +Vin Grounded Cathode LED Driver Scope Photo +5V Input Signal +2.5V 0V +2.8V Vout, 10 ohm Load 0V Clean With Feedback Capacitor LED On +2.5V Vout, LED Load LED Off 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin Grounded Cathode LED Driver Scope Photo +5V Input Signal +2.5V 0V +2.8V Vout, 10 ohm Load Oscillations Without Feedback Capacitor 0V LED On +2.5V Vout, LED Load LED Off 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin Grounded Cathode LED Driver Scope Capture Vout, LED Load LED On 0.64Vp-p +2.5V Oscillation (333kHz, 0.64Vp-p), Cf = 0 pF Loop Instability 3us per cycle => 333kHz LED Off 0V Clean (small overshoot), Cf = 1,500pF +2.5V Stable 0V Very Clean, Cf = 33,000pF V: 0.2V / small div T: 0.5us / small div +2.5V Stable 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin Grounded Cathode LED Driver Scope Photo +5V Input Signal +2.5V 0V +2.8V Vout, 10 ohm Load 5sec Fall 0V Turn-Off Step Response LED On 5sec Fall +2.5V Vout, LED Load LED Off 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin Grounded Cathode LED Driver Scope Photo +5V Input Signal +2.5V 0V +2.8V Vout, 10 ohm Load 12sec Rise Turn-On Step Response 0V 12sec Delay Charging Internal Gate Cap +2.5V LED On Vout, LED Load 12sec Rise LED Off 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin Grounded Cathode LED Driver Scope Photo +5V Input Signal +2.5V 0V +2.8V Vout, 10 ohm Load Oscillations Without Feedback Capacitor 0V Vout, LED Load LED On +2.5V LED Off 0V

OPA569 Power Op Amp Application +5V Single Supply with +Vin Grounded Cathode LED Driver Scope Photo +5V Input Signal +2.5V 0V +2.8V Vout, 10 ohm Load Clean With Feedback Capacitor 0V Vout, LED Load LED On +2.5V LED Off 0V

Designing Power Current Sources Internal Current Monitor Feedback using Internal Current Monitor (Instead of External Shunt Resistor)

OPA569 Power Op Amp Application +5V Single Supply, Current Source Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Current Source Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Current Source Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Current Source Tina Simulation

Designing Power Voltage Sources Tina Simulations Voltage Source Drive

OPA569 Power Op Amp Application +5V Single Supply, Voltage Source Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Voltage Source Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Voltage Source Tina Simulation

With Constant Current Source Power Op Amps Bridge Tied Load for Floating Output With Constant Current Source

OPA551 Power Op Amp Application 24V Single Supply, Current Source

OPA551 Power Op Amp Application 24V Single Supply, Current Source

OPA551 Power Op Amp Application 24V Single Supply, Current Source

OPA551 Power Op Amp Application 24V Single Supply, Current Source

OPA725 + Power Transistors Power Op Amp Application 5V Single Supply, Current Source

OPA725 + Power Transistors Power Op Amp Application 5V Single Supply, Current Source

OPA725 + Power Transistors Power Op Amp Application 5V Single Supply, Current Source

OPA569 Power Op Amp Application +5V Single Supply, Bridge Current Source Resistive Load Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Bridge Current Source Resistive Load Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Bridge Current Source Resistive Load Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Bridge Current Source Resistive Load Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Bridge Current Source Resistive Load Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Bridge Current Source Resistive Load Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Bridge Current Source Inductive Load Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Bridge Current Source Inductive Load Tina Simulation

OPA569 Power Op Amp Application +5V Single Supply, Bridge Current Source Inductive Load Tina Simulation

DRV103 / DRV104 Low or Hi PWM Drivers Constant Output Current Application

DRV103 Constant Current PWM Driver DMOS Power Transistor Up to 3A Out SO-8 PowerPad 8V-40V 0.1Ω 6 INA139 DRV103 Load 5.2Ω 9mH - + Vref Osc Low-side Switch 5V Input 5 PWM 8 10K Delay 2.2nF 100K 2 3 1 4 OPA340 5V NC - 191K + 100K Iset 1A/V 2.2nF V

DRV103 Constant Current PWM Driver

DRV104 Constant Current PWM Driver DMOS Power Transistor Up to 1.5A peak SO-8 PowerPad 8V-32V 10 0.2Ω 8,9 INA139 DRV104 High-side Switch - + Vref Osc 5V 5 Input 470pF PWM 10K 14 Delay 2.2nF 6,7 Load 5.2Ω 9mH 100K 2 3 1 11 5V NC - 191K + 100K Iset 0.5A/V 2.2nF V OPA340

DRV104 Constant Current PWM Driver