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1:0321 1:0351 Negative Voltage Hot Swap Controller with Active Power Filter
Active Power Filter only Evalvation Board
Although the IXHQ100 incorporates all the functions necessary to implement a state of the art negative voltage hot swap, a key feature of the IXHQ100 is its Power Active Filter. For those size and cost sensitive applications requiring only a Power Active Filter, the evaluation board schematic is given in Figure 1,with bill of materials in Figure 4. Figure 2 is aripple rejection plot of the Power Active Filter placed in the test circuit provided in Figure 3. Some of the advantages of a Power Active Filter over standard passive filters are: * Significantly reduced size of the power supply bypass capacitors. * Eliminate magnetic noise generation by eliminating the need for power filter inductors. * Reduced sensitivity to power supply noise. * Reduce size, weight, and overall system cost.
ACTIVE POWER FILTER
CAUTION: These devices are sensitvie to electrostatic discharge; take caution when handling and assembling this component.
4C
Figure 1
IXYS reserves the right to change limits, test conditions and dimensions.
Copyright (c) IXYS CORPORATION 2000
www.ixys.com 1
98716 (08/21/00)
IXHQ 100PI IXHQ 100SI
Typical Ripple Noise Attenuation
20 10 0 Attenuation (dB) -10 -20 -30 -40 -50 -60 -70 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 Frequency (Hz)
Figure 2
2
IXHQ 100PI IXHQ 100SI
Figure 3
Bill of Materials
Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Reference Number Part Value C1 10uF/100V C2 3.3nF 25V C3 10uF/25V C4 10uF/16V C5 100uF/100V Q1 IRF2807S R2 10 Kohm 0.1W att R3 3 Kohm 0.1W att R6 0 ohm 0.1W att R7 0 ohm 0.1W att R12 16 Kohm 0.1W att R13 16 Kohm 0.1W att R14 16 Kohm 0.1W att R17 10 Kohm 0.1W att R18 10 Kohm 0.1W att R19 100 kohm 0.1W att Rg 10 ohm 0.1W att U1 IXHQ100 TH 0805 TH TH TH D2 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805
Figure 4
3
IXHQ 100PI IXHQ 100SI Using the IXHQ100 active filter minimizes the number of extra de-coupling capacitors. This improves noise immunity of the circuit board. Additionaly, low output impedance of the filter also improves the performance of noise cancellation on power lines. An extra advantage of using the IXHQ100 over capacitors is the amount of space one can save. Figure 6 gives an example of cross talk noise cancellation by the IXHQ100 and an comparison of the size difference between an IXHQ100 chip and a capacitor (to scale).
V!
I!
Load3
C@!
RC>F!
RF>F!
Card
I!
RC>F
RF>F V!
Time
Time
Power + Source _
Backplane
Figure 5
4

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