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PSA Datasheet(PDF) 9 Page - Power-One |
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PSA Datasheet(HTML) 9 Page - Power-One |
9 / 11 page REV. SEP 17, 2003 Page 9 of 11 PSA Series Extended Datasheet Positive Switching Regulator s (Benign) Description of Options With this series, the options i (inhibit), R (control input for output voltage adjustment) and Y (small soldering pins) are defined as a package. Other combinations or parts of this package are not available. R Control for Output Voltage Adjustment Note: With open R input, Uo ≈ U o nom. The output voltage Uo can either be adjusted with an ex- ternal reference voltage (Uext) or with an external resistor (Rext). The adjustment range is 0...100% of Uo nom. The Fig. 11 Voltage adjustment with Uext between R and Go– Uo Uext Uext ≈ 2.5 V • ––––– Uo ≈ Uo nom • ––––– Uo nom 2.5 V Fig. 12 Voltage adjustment with external resistor Rext 4000 Ω • U o Uo nom • Rext Rext ≈ ––––––––––– Uo ≈ –––––––––––– Uo nom – Uo Rext + 4000 Ω Vo+ R + 4000 Ω G Uref Uext – + Go – 06035 Caution: To prevent damage Uext must neither exceed 2.7 V, nor be negative! Vo + R – + G 4000 Ω Uref Rext Go – 06040 minimum differential voltage DUio min between input and output (see: Electrical Input Data) should be maintained. Undervoltage look-out = minimum input voltage. Table 9: Inhibit characteristics Characteristics Conditions min typ max Unit Uinh Inhibit input voltage to keep Uo = on Ui min...Ui max –10 +0.8 V DC regulator output voltage... Uo = off TC min...TC max +2.4 +50 t r Switch-on time after inhibit command Ui = Ui nom 2ms t f Switch-off time after inhibit command RL = Uo nom /Io nom 4 Ii inh Input current when inhibited Ui = Ui nom 10 mA 0 t t 0 Inhibit 1 0.1 1 Uo/Uo nom tr tf 06001 Fig. 10 Output response as a function of inhibit signal i Inhibit for Remote On and Off Note: With open i-input, output is enabled (Uo = on) The inhibit input allows the switching regulator output to be disabled via a control signal. In systems with several units, this feature can be used, for example, to control the activa- tion sequence of the regulators by a logic signal (TTL, C- MOS, etc.). An output voltage overshoot will not occur when switching on or off. Vi+ Gi– Go– i Vo+ Iinh Uinh 06009 Fig. 9 Definition of Iinh and Uinh Fig. 8 Typical inhibit current Iinh versus inhibit voltage Uinh 4 2 0 -50 -40 20 40 -30 0 -20 -10 10 30 50 5 3 1 Iinh [mA] Uinh [V] Uo on Uo off 06010 |
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