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DocID023128 Rev 7 5/43
A7985A List of figures
43
List of figures
Figure 1. Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4. Oscillator circuit block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 5. Sawtooth: voltage and frequency feed-forward; external synchronization . . . . . . . . . . . . . 12
Figure 6. Oscillator frequency vs. the FSW pin resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 7. Soft-start scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 8. Overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 9. The error amplifier, the PWM modulator and the LC output filter . . . . . . . . . . . . . . . . . . . . 21
Figure 10. Type III compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 11. Open loop gain: module Bode diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 12. Open loop gain Bode diagram with ceramic output capacitor . . . . . . . . . . . . . . . . . . . . . . 24
Figure 13. Type II compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 14. Open loop gain: module Bode diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 15. Open loop gain Bode diagram with electrolytic/tantalum output capacitor . . . . . . . . . . . . . 27
Figure 16. Switching losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 17. Layout example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 18. Demonstration board application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 19. PCB layout: A7985A (component side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 20. PCB layout: A7985A (bottom side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 21. PCB layout: A7985A (front side). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 22. Junction temperature vs. output current at VIN = 24 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 23. Junction temperature vs. output current at VIN = 12 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 24. Junction temperature vs. output current at VIN = 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 25. Efficiency vs. output current at VO = 1.8 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 26. Efficiency vs. output current at VO = 5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 27. Efficiency vs. output current at VO = 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 28. Load regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 29. Line regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 30. Load transient: from 0.4 A to 2 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 31. Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 32. Short-circuit behavior at VIN = 12 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 33. Short-circuit behavior at VIN = 24 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 34. Positive buck-boost regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 35. Maximum output current according to max. DC switch current (2.0 A): VO = 12 V. . . . . . . 37
Figure 36. Inverting buck-boost regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 37. Maximum output current according to switch max. peak current (2.0 A): VO = -5 V. . . . . . 38
Figure 38. HSOP8 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39