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DCP021515U Datasheet(PDF) 7 Page - Texas Instruments |
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DCP021515U Datasheet(HTML) 7 Page - Texas Instruments |
7 / 17 page www.ti.com ADDITIONAL FUNCTIONS DISABLE/ENABLE DECOUPLING Connecting the DCP02 in Parallel Ripple Reduction Connecting the DCP02 in Series DCP 02 +V OUT V SUPPLY +V OUT -VOUT -VOUT 0V V S 0V COM C requiresalow-ESRceramiccapacitor:5Vto15Vversionis2.2 F; 24Vversionisminimum0.47 F. m IN m NOTE:(1) C IN (1) C 1.0 F OUT m C 1.0 F OUT m V SUPPLY 2xPowerOut COM DCP 02 V OUT V S 0V SYNC 0V DCP 02 V OUT V S 0V SYNC 0V C requiresalow-ESRceramiccapacitor:5Vto15Vversionis2.2 F; 24Vversionisminimum0.47 F. m IN m NOTE:(1) C IN (1) C 1.0 F OUT m C IN (1) C 1.0 F OUT m DCP02 Series SBVS011K – MARCH 2000 – REVISED FEBRUARY 2008 Connect the positive VOUT from one DCP02 to the The DCP02 can be disabled or enabled by driving the negative VOUT (0V) of another (see Figure 7). If the SYNC pin using an open drain CMOS gate. If the SYNC pins are tied together, the self-synchronization SYNC pin is pulled low, the DCP02 will be disabled. feature of the DCP02 prevents beat frequencies on The disable time depends upon the external loading; the voltage rails. The SYNC feature of the DCP02 the internal disable function is implemented in 2 µs. allows easy series connection without external Removal of the pull down causes the DCP02 to be filtering, thus minimizing cost. enabled. The outputs on the dual-output DCP02 versions can Capacitive loading on the SYNC pin should be also be connected in series to provide two times the minimized in order to prevent a reduction in the magnitude of VOUT, as shown in Figure 8. For oscillator frequency. example, a dual 15V DCP022415D could be connected to provide a 30V rail. If the output power from one DCP02 is not sufficient, it is possible to parallel the outputs of multiple The high switching frequency of 400kHz allows DCP02s, as shown in Figure 9. Again, the SYNC simple filtering. To reduce ripple, it is recommended feature allows easy synchronization to prevent that a 1 µF capacitor be used on V OUT. Dual outputs power-rail beat frequencies at no additional filtering should both be decoupled to pin 5. A 2.2 µF capacitor cost. on the input is also recommended. Multiple DCP02 isolated 2W DC/DC converters can be connected in series to provide nonstandard voltage rails. This configuration is possible by using the floating outputs provided by the galvanic isolation of the DCP02. Figure 8. Connecting Dual Outputs in Series Figure 9. Connecting Multiple DCP02s in Parallel Copyright © 2000–2008, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): DCP02 Series |
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