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DCP021205U Datasheet(PDF) 10 Page - Texas Instruments

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Part # DCP021205U
Description  DCP02x 2-W, Isolated, Unregulated DC/DC Converter Modules
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DCP021205U Datasheet(HTML) 10 Page - Texas Instruments

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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
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Product Folder Links: DCP020503 DCP020505 DCP020507 DCP020509 DCP020515D DCP021205 DCP021212
DCP021212D DCP021515 DCP022405 DCP022405D DCP022415D


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