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

2. 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

3. 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 Top Pwr Pad

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

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

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

7. 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

8. 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

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

10. 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

11. 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!!!

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

13. 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

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

15. OPA541 Power Op Amp Application Howland Power Current Source

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

17. 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

18. 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

19. 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

20. 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

21. 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

22. 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

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

24. 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

25. 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

26. 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

27. 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

28. 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

29. 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

30. 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

31. 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

32. 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

33. 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

34. 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

35. 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

36. 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

37. 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

38. 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

39. 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

40. 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

41. 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

42. 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

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

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

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

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

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

48. Designing Power Voltage Sources
Tina Simulations
Voltage Source Drive

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

70. 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

71. DRV103 Constant Current PWM Driver

72. 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

73. DRV104 Constant Current PWM Driver