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LTC4240IGN Folha de dados(PDF) 25 Page - Linear Technology |
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LTC4240IGN Folha de dados(HTML) 25 Page - Linear Technology |
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25 / 28 page  LTC4240 25 4240f Disallowing bulk capacitors on the input power pins mitigates the inrush current during hot plug. However, it also tends to create a resonant circuit formed by the inductance of the backplane power supply trace and the parasitic capacitance of the plug-in board (mainly due to the large power FET). Upon board insertion, the ringing of this circuit will exhibit peak overshoot as high as 2.5 times the steady state voltage (>30V for 12V). There are two methods for abating the effects of these high voltage transients: using zener clamps, and using snubber APPLICATIO S I FOR ATIO Figure 17. Place Transient Protection Device Close to the LTC4240 C1 0.047 µF C7 0.1 µF 0.1 µF 3VIN MEDIUM 3.3V MEDIUM 5V 3VSENSE 22 3VOUT 24 5VIN 21 5VOUT 6 5VSENSE 20 23 GATE 19 R3 10 Ω R4 10 Ω 5VOUT AT 5A 3VOUT AT 7.6A R5 1k R1 0.005 Ω Q1 Si7880DP Q2 Si7880DP R2 0.007 Ω Z3 Z4 LTC4240* 1644 F17 GND 10 Z3, Z4: 1PMT5.0AT3 *ADDITIONAL DETAILS OMITTED FOR CLARITY LONG 5V LONG 3.3V 2.7 Ω R23 2.7 Ω R22, 2.74 Ω R21, 1.74 Ω Figure 15. 5V Supply Only Application Circuit MEDIUM 5V LONG 5V C1 0.047 µF GND 21 3VOUT 6 LTC4240* 22 5VOUT 24 23 20 GATE 19 10 4240 F15 R5 1k R22 2.74 Ω CompactPCI BACKPLANE CONNECTOR (FEMALE) CompactPCI BACKPLANE CONNECTOR (MALE) GND 5VIN 5VIN D1 5VSENSE 3VIN 3VSENSE R4 10 Ω 5VOUT R2 0.007 Ω Q2 Si7880DP D2 D1, D2: BAV99 CL(5VOUT) Z4 *ADDITIONAL DETAILS OMITTED FOR CLARITY Z4: 1PMT5.0AT3 GND LTC4240* 10 1.2k PUSHBUTTON SWITICH 100 Ω V(I/O) 1k GND OFF/ON 28 BD_SEL# 4240 F16 *ADDITIONAL DETAILS OMITTED FOR CLARITY CompactPCI BACKPLANE CONNECTOR (FEMALE) CompactPCI BACKPLANE CONNECTOR (MALE) Figure 16. BD_SEL# Pushbutton Toggle Switch networks. Snubbers are RC networks whose time constants are large enough to damp the inductance of the parasitic resonant circuit. The snubber capacitor should be 10X to 100X the value of the plug-in board parasitic capacitance. The value of the series snubber resistor should be large enough to damp the resulting R-L-C circuit and is typically between 1 Ω and 50Ω. These protection networks should be mounted very close to the LTC4240 in order to minimize parasitic inductance. This is shown in Figure 17 for the 3.3V and 5V supplies. |
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