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MCZ34652EFR2SCALE Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc |
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MCZ34652EFR2SCALE Datasheet(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 26 page Analog Integrated Circuit Device Data 10 Freescale Semiconductor 34652 FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION Most telecom and data transfer networks require that circuit boards be inserted and removed from the system without powering down the entire system. When a circuit board is inserted into or removed from a live backplane, the filter or bypass capacitors at the input of the board’s power module or switching power supply can cause large transient currents when being charged or discharged. These currents can cause severe and permanent damage to the boards, thus making the system unstable. Figure 4 displays the inrush current to the filter capacitor if a hot swap device is absent. The inrush current reached an unsafe value of more than 55 A. Figure 4. Circuit Board Insertion Without a Hot Swap Device, Inrush Current Not Limited The 34652 is an integrated negative voltage hot swap controller with an internal Power MOSFET. The 34652 resides on the plug-in boards and allows the boards to be safely inserted or removed by powering up the supply voltages in a controlled manner and regulating the inrush current to a user-programmable limit, thus allowing the system to safely stabilize (see Figure 5). The 34652 provides protection against overcurrent, undervoltage, overvoltage, and overtemperature. Furthermore, it protects the system from short circuits. Figure 5. Circuit Board Insertion With the Hot Swap Device, Inrush Current Limited By integrating the control circuitry and the Power MOSFET switch into a space-efficient package, the 34652 offers a complete, cost-effective, and simple solution that takes much less board space than a similar part with an external Power MOSFET requires. The 34652 can be used in -48 V telecom and networking systems, servers, electronic circuit breakers, -48 V distributed power systems, negative power supply control, and central office switching. FUNCTIONAL PIN DESCRIPTION NEGATIVE SUPPLY INPUT VOLTAGE (VIN) The VIN pin is the most negative power supply input. All pins except the DISABLE pin are referenced to this input. POWER GOOD OUTPUT (ACTIVE HIGH) (PG) The PG pin is the active high power good output signal that is used to enable or disable a load. This signal goes active after a successful power-up sequence and stays active as long as the device is in normal operation and is not experiencing any faults. The signal is deactivated under the following conditions: • Power is turned off. • The device is disabled for more than 1.0 ms. • The device exceeded its thermal shutdown threshold for more than 12 µs. • The device is in overvoltage or undervoltage mode for more than 1.0 ms. • Load current exceeded the overcurrent limit for more than 3.0 ms. This pin is referenced to VIN. |
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