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DCP010505B Datasheet(PDF) 11 Page - Burr-Brown (TI) |
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DCP010505B Datasheet(HTML) 11 Page - Burr-Brown (TI) |
11 / 20 page DCP01B SERIES SBVS012B − DECEMBER 2000 − REVISED OCTOBER 2004 www.ti.com 11 APPLICATION INFORMATION The DCP01B, DCV01, and DCP02 are three families of miniature DC/DC converters providing an isolated unregulated voltage output. All are fabricated using a CMOS/DMOS process with the DCP01B replacing the familiar DCP01 family that was fabricated from a bipolar process. The DCP02 is essentially an extension of the DCP01B family providing a higher power output with a significantly improved load regulation, and the DCV01 is tested to a higher isolation voltage. TRANSFORMER DRIVE CIRCUIT Transformer drive transistors have a characteristically low value of transistor on resistance (RDS); thus, more power is transferred to the transformer. The transformer drive circuit is limited by the base current available to switch on the power transistors driving the transformer and their characteristic current gain (beta), resulting in a slower turn-on time. Consequently, more power is dissipated within the transistor. This results in a lower overall efficiency, particularly at higher output load currents. SELF-SYNCHRONIZATION The input synchronizations facility (SYNCIN), allows for easy synchronizing of multiple devices. If two to eight devices (maximum) have their respective SYNCIN pins connected together, then all devices will be synchronized. Each device has its own onboard oscillator. This is generated by charging a capacitor from a constant current and producing a ramp. When this ramp passes a threshold, an internal switch is activated that discharges the capacitor to a second threshold before the cycle is repeated. When several devices are connected together, all the internal capacitors are charged simultaneously. When one device passes its threshold during the charge cycle, it starts the discharge cycle. All the other devices sense this falling voltage and, likewise, initiate a discharge cycle so that all devices discharge together. A subsequent charge cycle is only restarted when the last device has finished its discharge cycle. OPTIMIZING PERFORMANCE Optimum performance can only be achieved if the device is correctly supported. By the very nature of a switching converter, it requires power to be instantly available when it switches on. If the converter has DMOS switching transistors, the fast edges will create a high current demand on the input supply. This transient load placed on the input is supplied by the external input decoupling capacitor, thus maintaining the input voltage. Therefore, the input supply does not see this transient (this is an analogy to high-speed digital circuits). The positioning of the capacitor is critical and must be placed as close as possible to the input pins and connected via a low-impedance path. The optimum performance is primarily dependent on two factors: 1. Connection of the input and output circuits for minimal loss. 2. The ability of the decoupling capacitors to maintain the input and output voltages at a constant level. PCB Design The copper losses (resistance and inductance) can be minimized by the use of mutual ground and power planes (tracks) where possible. If that is not possible, use wide tracks to reduce the losses. If several devices are being powered from a common power source, a star-connected system for the track must be deployed; devices must not be connected in series, as this will cascade the resistive losses. The position of the decoupling capacitors is important. They must be as close to the devices as possible in order to reduce losses. See the PCB Layout section for more details. |
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