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DCV011512DP Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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DCV011512DP Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 11 page 7 ® DCV01 FIGURE 1. Connecting the DCV01 in Series. FUNCTIONAL DESCRIPTION OVERVIEW The DCV01 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. Separate primary and secondary transformer windings give good isolation and low barrier capacitance. 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 DCV01 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 SYNCIN pin LOW. The output pins will be tri-stated. This will occur in 2 µs. THERMAL SHUTDOWN The DCV01 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 DCV01 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 DCV01’s basic construction is the same as standard ICs. There is no substrate within the molded package. The DCV01 is constructed using an IC, rectifier diodes, and a wound magnetic toroid on a leadframe. As there is no solder within the package, the DCV01 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 DCV01 can be disabled or enabled by driving the SYNC pin using an open drain CMOS gate. If the SYNCIN pin is pulled low, the DCV01 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 DCV01 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 DCV01 in versions is recommended. DCV 01 V OUT 1 V SUPPLY V S 0V DCV 01 V OUT 2 V OUT1 + VOUT 2 SYNC IN SYNC IN V S 0V 0V 0V COM |
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