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DCP021212 Datasheet(PDF) 10 Page - Texas Instruments |
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DCP021212 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 28 page DCP020503, DCP020505, DCP020507, DCP020509, DCP020515D, DCP021205 DCP021212, DCP021212D, DCP021515, DCP022405, DCP022405D, DCP022415D SBVS011L – MARCH 2000 – REVISED MAY 2015 www.ti.com Feature Description (continued) 8.3.2 Power Stage The DCP02 series of devices use a push-pull, center-tapped topology. The DCP02 devices switch at 400 kHz (divide-by-2 from an 800-kHz oscillator). 8.3.3 Oscillator And Watchdog Circuit The onboard, 800-kHz oscillator generates the switching frequency via a divide-by-2 circuit. The oscillator can be synchronized to other DCP02-series device 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 disabled by pulling the SYNC pin low. When the SYNC pin goes low, the output pins transition into tri-state mode, which occurs within 2 μs. 8.3.4 Thermal Shutdown The DCP02 series of devices are protected by a thermal-shutdown circuit. If the on-chip temperature rises above 150°C, the device shuts down. Normal operation resumes as soon as the temperature falls below 150°C. 8.3.5 Synchronization In the event that more than one DC/DC converter is needed onboard, beat frequencies and other electrical interference can be generated. This interference occurs because of the small variations in switching frequencies between the DC/DC converters. The DCP02 series of devices overcome this interference by allowing devices to be synchronized to one another. Up to eight devices can be synchronized by connecting the SYNC pins together, taking care to minimize the capacitance of tracking. Stray capacitance (greater than 3 pF) has the effect of reducing the switching frequency, or even stopping the oscillator circuit. The maximum recommended voltage applied to the SYNC pin is 3.0 V. For an application that uses more than eight synchronized devices use an external device to drive the SYNC pins. The application report External Synchronization of the DCP01/02 Series of DC/DC Converters (SBAA035) describes this configuration. NOTE During the start-up period, all synchronized devices draw maximum current from the input simultaneously. If the input voltage falls below approximately 4 V, the devices may not start up. A 2.2- μF capacitor should be connected close to each device's input pin. 8.3.6 Construction The basic construction of the DCP02 series of devices is the same as standard integrated circuits. The molded package contains no substrate. The DCP02 series of devices are constructed using an IC, rectifier diodes, and a wound magnetic toroid on a leadframe. Because the package contains no solder, the devices do not require any special printed circuit board (PCB) assembly processing. This architecture results in an isolated DC/DC converter with inherently high reliability. 8.3.7 Thermal Management Due to the high power density of this device, it is advisable to provide ground planes on the input and output. 10 Submit Documentation Feedback Copyright © 2000–2015, Texas Instruments Incorporated Product Folder Links: DCP020503 DCP020505 DCP020507 DCP020509 DCP020515D DCP021205 DCP021212 DCP021212D DCP021515 DCP022405 DCP022405D DCP022415D |
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