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PSC126-7LIRPCDG Datasheet(PDF) 11 Page - Bel Fuse Inc. |
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PSC126-7LIRPCDG Datasheet(HTML) 11 Page - Bel Fuse Inc. |
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11 / 19 page  PSC, PSL Series Data Sheet Positive Switching Regulators MELCHER The Power Partners. BCD20027-G Rev AC1, 12-Apr-2018 Page 11 of 19 Auxiliary Functions i Inhibit (Remote On / Off) The inhibit input allows the switching regulator output to be disabled via a control signal. In systems with several converters, this feature can be used, for example, to control the activation sequence of the converters by a logic signal (TTL, C-MOS, etc.). An output voltage overshoot will not occur, when switching on or off. Note: With open i-input, the output is enabled. Fig. 7 Typical inhibit current Iinh versus inhibit voltage Vinh Fig. 8 Definition of Iinh and Vinh Fig. 6 Overload, short-circuit behaviour Vo versus Io. Output Protection and Short Circuit Behaviour A voltage suppressor diode, which in worst case conditions fails into a short circuit (or a thyristor crowbar, option C), protects the output against an internally generated over- voltage. Such an overvoltage could occur due to a failure of either the control circuit or the switching transistor. The output 1.0 0.8 0.6 0.4 0 0.2 0.4 1.0 1.2 0.2 0.6 0.8 V o /Vo nom I o /Io nom I o L 05033a I o nom 4 2 0 –40 20 40 0 –20 V 5 3 1 I inh [mA] V inh Output on Output off 06034a Vi+ Gi– Go– i Vo+ I inh V inh 06009a Table 5: Inhibit characteristics Characteristics Conditions min typ max Unit Vinh Inhibit input voltage Vo = on Vi min – Vi max –50 +0.8 V Vo = off TC min –TC max +2.4 +50 t r Switch-on time Vi = Vi nom 130 ms t f Switch-off time RL =Vo nom/Ionom 25 I i inh Input current when inhibited Vi = Vi nom 25 mA protection is not designed to withstand externally applied overvoltages. A constant current limitation circuit holds the output current almost constant, when an overload or a short circuit is applied to the output. It acts self-protecting and recovers automatically after removal of the overload or short circuit condition. Parallel and Series Connection Outputs of equal nominal voltages can be parallel-connected. However, the use of a single regulator with higher output power, is always the better solution. In parallel-connected operation, one or several outputs may operate continuously at their current limit knee-point which will cause an increase of the heat generation. Consequently, the max. ambient temperature should be reduced by 10 °C. Outputs can be series-connected with any other regulator. In series-connection the maximum output current is limited by the lowest current limitation, but electrically separated source voltages are needed for each regulator. |
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