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DCP011515DP Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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DCP011515DP Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 10 page 8 DCP0115 ® up to 10 µs. Making the gate open drain will re-enable the DCP0115. However, there is a trade-off in using this function; the DCP0115 quiescent current may increase and the on-chip oscillator may run slower. This degradation in performance is dependent on the external CMOS gate capacitance, therefore the smaller the capacitance, the lower the performance de- crease. Driving the SYNCIN pin with a CPU type tri-state output, which has a low output capacitance, offers the lowest reduction in performance. DECOUPLING Ripple Reduction The high switching frequency of 400kHz allows simple filtering. To reduce ripple, it is recommended that 0.47 µF capacitors are used on VS and VOUT (see Figure 3). Dual outputs should both be decoupled to pin 5. In applications where power is supplied over long lines and output loading is high, or, there is significant inductance at the output, it may be necessary to use a 2.2 µF capacitor on the input to insure startup. There is no restriction on the size of the output capacitor used to reduce ripple. The DCP0115 will start into any capacitive load. Low ESR capacitors will give the best reduction. EXTERNAL SYNCHRONIZATION The DCP0115 can be synchronized externally if required using a simple external interface. Figure 4 shows a universal interface using a 4066 quad switch. The CTL and SYNCON pins are used to select external synchronization or self- synchronization. This interface can also be used to stop (disable) the DCP0115. FIGURE 4. Universal Interface. CTL SYNCON FUNCTION 1 1 External Sync — 0 Self-Sync 0 1 Device Stop FIGURE 3. DCP011515 Fully Loaded. DCP0115xxx 1 2 5 6 7 14 8 V CC 0V 0V +V OUT –V OUT SYNC I/O 1A I/O 1B U1 CONT C 3 470nF C 6 470nF (One Per DC/DC) DCP0105xxx 1 2 5 6 7 14 8 V CC 0V 0V +V OUT SYNC R 1 33k Ω R 2 33k Ω DCP0105xxx 1 2 5 6 7 14 8 V CC 0V 0V +V OUT SYNC C 4 470nF +5V +5V 0V +Out 2 0V +Out 3 I/O 1A I/O1B U3 CONT I/O 1A I/O 1B U4 CONT I/O 1A I/O 1B U5 CONT SYNC ON FREQ IN CTL R 3 33k Ω 0V 0V 0V 0V C 5 470nF +15V 0V 4066 C 1 470nF C 2 470nF +15V 0V +Out 1 –Out 1 +5V 1 2 5 6 7 V S 0V 0V +V Out –V Out C 1 0.47µF +15V C 3 0.47µF R 3 820 Ω R 4 1k Ω C 2 0.47µF R 1 820 Ω R 2 1k Ω DCP0115 |
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