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DCP010515BP Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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DCP010515BP Datasheet(HTML) 9 Page - Burr-Brown (TI) |
9 / 20 page DCP01B SERIES SBVS012B − DECEMBER 2000 − REVISED OCTOBER 2004 www.ti.com 9 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 uses an advanced BiCMOS/DMOS process. For additional information, refer to the application notes located in the DCP01B product folder at www.ti.com. 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. If the thermal condition continues, operation will randomly cycle on and off. This will continue until the temperature is reduced. 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, taking care to minimize the stray capacitance. 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 startup, all devices will draw maximum current simultaneously. This can cause the input voltage to dip. If it dips 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 external device. Details are contained in Application Report SBAA035, External Synchronization of the DCP01/02 Series of DC/DC Converters, available for download at www.ti.com. CONSTRUCTION The DCP01B 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. Since 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 function 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 A high switching frequency of 400kHz allows simple filtering. To reduce ripple, it is recommended that at least a 1 µF capacitor is used on VOUT. Dual outputs should have both the positive and negative buses decoupled to VOUT ground (pin 5). The required 2.2 µF low equivalent series resistance (ESR) ceramic capacitor on the input of the 5V to 15V versions, and the ≥ 0.47µF low-ESR ceramic capacitor on the 24V versions help reduce ripple and noise. See Application Bulletin SBVA012, DC-to-DC Converter Noise Reduction, available for download at www.ti.com. |
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