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5 / 12 page BCP Models 7 5 W , D U A L O U T P U T , M I X E D - V O L T A G E D C / D C C O N V E R T E R S Output Overvoltage Protection Each voltage output of the BCP Series converter is independently monitored via an auxiliary winding in the output inductor. If the output voltage should rise to a level which could be damaging to the load circuitry (see Performance/Functional Specifications for limits), the overvoltage circuitry will power down the PWM controller and latch off the DC/DC converter. The device must now be restarted by powering cycling VIN. Current Limiting When output current demands exceed the maximum output current rating by 107% to 133%, the DC/DC converter will go into a current limiting mode. In this condition the output voltage decreases proportionately as the output current increases, thereby maintaining a somewhat constant power dissipa- tion—referred to as Power Limiting (see Figure 2). As the load approaches a short circuit, the output current will continue to increase until it reaches the rated Short Circuit Current limit. Short Circuit Condition As described under "Current Limiting," when the BCP Series DC/DC con- verter output is subjected to a short circuit condition, the output current will remain at the Short Circuit Current limit . In this state there is negligible power dissipated in the load. Therefore, most of the input power is dissipated within the converter, causing the internal temperature to increase. If this condition persists, Thermal Shutdown will activate and shutdown the DC/DC converter. When the internal temperature is sufficiently decreased, the converter will self-start. Thermal Shutdown The BCP Series is equipped with Thermal Shutdown circuitry. If the internal temperature of the DC/DC converter rises above the designed operating temperature, a precision temperature sensor will power down the unit. When the internal temperature decreases below the threshold of the temperature sensor the unit will self-start. BCP-5/15-3.3/15-D24, D48 Current Limiting Characteristics (Nominal VIN) Output Current, IOUT (Amps) 6.00 5.00 4.00 3.00 2.00 1.00 0 5V Output 3.3V Output Figure 2. Current Limiting Characteristics Input Reverse-Polarity Protection Upon applying a reverse-polarity voltage to the DC/DC converter, an internal diode will be forward biased and draw excessive current from the power source. Therefore, it is required that the input current be limited be either an appropriately rated input fuse or a current limited power source. Heat Sinks for BCP Series DATEL offers two standard heat sinks that can be mounted to the half-brick package to extend the converter's operating temperature range. Along with the standard 2.3" x 2.4" x 0.5" (HS-CP) heat sink, DATEL has designed a low-profile heat sink for height-restricted applications. This new heat sink (HS-CPLP2) is designed with radiant fins that extend 0.51" beyond either side of the 2.4" dimension of the BCP package. The convenience of this design is that the finned extensions protrude only 0.31" below the top surface of the DC/DC converter, allowing components with a profile height less than 0.215" to be mounted on the pc board below the heat sink. Therefore, while the surface area of the low-profile heat sink measures 2.3" x 3.5", pcb real estate is unaffected. For optimum thermal performance in a natural convection application, the low-profile heat sink should be mounted with the fins vertically oriented. Both models are shipped with 0.009" sellf-adhesive thermal pad and mounting screws. 6 5 4 3 2 1 0 0 100 200 300 400 500 600 700 AIR VELOCITY (FT./MIN.) HS-CP HS-CPLP2 HS-CP and HS-CPLP2 Heat Sink Performance Vs. Air Flow (@ 10.5 Watts Power Dissipation) 5 |
Nº de peça semelhante - BCP75W |
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