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Application Note

BOOST INDUCTANCE VS. INDUCTOR SIZE

1. INTRODUCTION

This application note explains the effects to performance of reducing the size of the boost inductor used

in the CDB150x-00 PFC demonstration board. The CDB150x-00 was designed using a 380 uH boost in-

ductor. However, for applications requiring a constant power load where the load is applied before V

link

has reached its nominal value, the system may fail to start. For these particular applications, reducing the

size of the boost inductor resolves this problem, but with slightly higher THD and lower efficiency. Please

see the Performance Plots section for specific information.

Presented in the following sections are the updated schematic and bill of materials. A complete set of per-

formance plots and oscilloscope waveforms are also included to demonstrate the system’s behavior with

the smaller boost inductor. Please reference the CDB150x-00 data sheet for comparison.

Extreme caution needs to be exercised while handling this board. This board is to be used by trained pro-

fessionals only. Prior to applying AC power to the CDB150x-00 board, the CS1500 needs to be biased

using an external 13 VDC power supply.

Figure 1. CS150x-00 Assembly

Boost Inductor (L5)

AN351

MAY ’11

AN351REV2

1 2 3 4 5 6 ... 11 12

Indice de contenidos

Pagina 1 - Application Note

Pagina 2 - 2 AN351REV2

AN35110 AN351REV24. SCHEMATIC 6&+(0&'%;5(9%=&6.:$1.:$16+((77,7/((&2 5(9 '(6&5,

Pagina 3 - AN351REV2 3

AN351AN351REV2 115. BILL OF MATERIALS CDB150X-00_Rev_B BILL OF MATERIALItem Cirrus P/N Rev Description QtyReference DesignatorMFG MFG P/N Notes1 070-

Pagina 4 - Figure 6. V

AN35112 AN351REV2Contacting Cirrus Logic SupportFor all product questions and inquiries contact a Cirrus Logic Sales Representative. To find the one n

Pagina 5 - AN351REV2 5

AN3512 AN351REV22. CONSTANT POWER & INDUCTANCE FACTOR (CPLF)To provide the necessary surge power, the inductor must be multiplied by the constant

Pagina 6 - 6 AN351REV2

AN351AN351REV2 33. PERFORMANCE PLOTS (L5 = 230 uH)05101520250 102030405060708090100THD (%)Output Power (W)Vin=110Vin=2204555657585950 102030405060708

Pagina 7 - AN351REV2 7

AN3514 AN351REV20.6750.7250.7750.8250.8750.9250.9750 102030405060708090100Power FactorOutput Power (W)Vin=110Vin=2203903923943963984004024044064084100

Pagina 8 - 8 AN351REV2

AN351AN351REV2 5Figure 7. Steady State Waveforms — 110 VACFigure 8. Switching Frequency Profile at Peak of AC Line Voltage — 110 VAC

Pagina 9 - AN351REV2 9

AN3516 AN351REV2Figure 9. Switching Frequency Profile at Trough of AC Line Voltage — 110 VACFigure 10. Steady State Waveforms — 220 VAC

Pagina 10 - 4. SCHEMATIC

AN351AN351REV2 7Figure 11. Switching Frequency Profile at Peak of AC Line Voltage — 220 VACFigure 12. Switching Frequency Profile at Trough of AC Li

Pagina 11 - 5. BILL OF MATERIALS

AN3518 AN351REV2Figure 13. Load Transient — 9 W to 90 W, 1 W/uS, 110 VACFigure 14. Load Transient — 90 W to 9 W, 1 W/uS, 110 VAC

Pagina 12 - Risk of Electric Shock

AN351AN351REV2 9Figure 15. Load Transient — 9 W to 90 W, 1 W/uS, 220 VACFigure 16. Load Transient — 90 W to 9 W, 1 W/uS, 220 VAC

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