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DCP010505BP-U Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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DCP010505BP-U Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 8 page 7 ® DCP01B FIGURE 1. Connecting the DCP01B in Series. FUNCTIONAL DESCRIPTION OVERVIEW The DCP01B offers up to 1W of unregulated output power with a typical efficiency of up to 85%. This is achieved through highly integrated packaging technology and the implementation of a custom power stage and control IC. The circuit design utilizes an advanced BiCMOS/DMOS pro- cess. POWER STAGE This uses a push-pull, center-tapped topology switching at 400kHz (divide by 2 from 800kHz oscillator). OSCILLATOR AND WATCHDOG The onboard 800kHz oscillator generates the switching frequency via a divide by 2 circuit. The oscillator can be synchronized to other DCP01B circuits or an external source, and is used to minimize system noise. A watchdog circuit checks the operation of the oscillator circuit. The oscillator can be stopped by pulling the SYNC pin LOW. The output pins will be tri-stated. This will occur in 2 µs. THERMAL SHUTDOWN The DCP01B is protected by a thermal shutdown circuit. If the on-chip temperature exceeds 150 °C, the device will shut down. Once the temperature falls below 150 °C, normal operation will resume. SYNCHRONIZATION In the event that more than one DC/DC converter is needed onboard, beat frequencies and other electrical interference can be generated. This is due to the small variations in switching frequencies between the DC/DC converters. The DCP01B overcomes this by allowing devices to be synchronized to one another. Up to eight devices can be synchronized by connecting the SYNCIN pins together, tak- ing care to minimize the capacitance of tracking. Stray capacitance (> 3pF) will have the effect of reducing the switching frequency, or even stopping the oscillator circuit. If synchronized devices are used, it should be noted that, at start up, all devices will draw maximum current simulta- neously. This can cause the input voltage to dip and should it dip below the minimum input voltage (4.5V), the devices may not start up. A 2.2 µF capacitor should be connected close to the input pins. If more than eight devices are to be synchronized, it is recommended that the SYNCIN pins are driven by an exter- nal device. Details are contained in a separate applications bulletin (AB-153). CONSTRUCTION The DCP01B’s basic construction is the same as standard ICs. There is no substrate within the molded package. The DCP01B is constructed using an IC, rectifier diodes, and a wound magnetic toroid on a leadframe. As there is no solder within the package, the DCP01B does not require any special PCB assembly processing. This results in an isolated DC/DC converter with inherently high reliability. ADDITIONAL FUNCTIONS DISABLE/ENABLE The DCP01B can be disabled or enabled by driving the SYNC pin using an open drain CMOS gate. If the SYNCIN pin is pulled low, the DCP01B will be disabled. The disable time depends upon the external loading; the internal disable func- tion is implemented in 2 µs. Removal of the pull down will cause the DCP01B to be enabled. Capacitive loading on the SYNCIN pin should be minimized in order to prevent a reduction in the oscillator frequency. DECOUPLING Ripple Reduction The high switching frequency of 400kHz allows simple filtering. To reduce ripple, it is recommended that at least a 1 µF capacitor is used on V OUT. Dual outputs should both be decoupled to pin 5. A 2.2 µF low ESR capacitor on the input of the 5V in versions, and a 0.47 µF low ESR cap on the 24V DCP01B in versions is recommended. DCP 01B V OUT 1 V SUPPLY V S 0V DCP 01B V OUT 2 V OUT1 + VOUT 2 SYNC IN SYNC IN V S 0V 0V 0V COM |
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