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DCP020503U Datasheet(PDF) 8 Page - Texas Instruments |
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DCP020503U Datasheet(HTML) 8 Page - Texas Instruments |
8 / 17 page www.ti.com APPLICATION INFORMATION OPTIMIZING PERFORMANCE TRANSFORMER DRIVE CIRCUIT SELF-SYNCHRONIZATION PCB Design DCP02 Series SBVS011K – MARCH 2000 – REVISED FEBRUARY 2008 The DCP01B, DCV01, and DCP02 are three families of miniature DC/DC converters providing an isolated unregulated voltage output. All are fabricated using a Optimum performance can only be achieved if the CMOS/DMOS process with the DCP01B replacing device is correctly supported. The very nature of a the familiar DCP01 family that was fabricated from a switching converter requires power to be instantly bipolar process. The DCP02 is essentially an available when it switches on. If the converter has extension of the DCP01B family, providing a higher DMOS switching transistors, the fast edges will create power output with a significantly improved load a high current demand on the input supply. This regulation. The DCV01 is tested to a higher isolation transient load placed on the input is supplied by the voltage. 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 Transformer drive transistors have a characteristically capacitor is critical and must be placed as close as low value of transistor on resistance (RDS); thus, more possible to the input pins and connected via a power is transferred to the transformer. The low-impedance path. transformer drive circuit is limited by the base current available to switch on the power transistors driving The optimum performance primarily depends on two the transformer and the characteristic current gain factors: (beta), resulting in a slower turn-on time. 1. Connection of the input and output circuits for Consequently, more power is dissipated within the minimal loss. transistor, resulting in a lower overall efficiency, 2. The ability of the decoupling capacitors to particularly at higher output load currents. maintain the input and output voltages at a constant level. The input synchronizations facility (SYNCIN) allows for easy synchronizing of multiple devices. If two to The copper losses (resistance and inductance) can eight devices (maximum) have their respective be minimized by the use of mutual ground and power SYNCIN pins connected together, then all devices will planes (tracks) where possible. If that is not possible, be synchronized. use wide tracks to reduce the losses. If several devices are being powered from a common power Each device has its own onboard oscillator. This source, a star-connected system for the track must oscillator is generated by charging a capacitor from a be deployed; devices must not be connected in constant current and producing a ramp. When this series, as this will cascade the resistive losses. The ramp passes a threshold, an internal switch is position of the decoupling capacitors is important. activated that discharges the capacitor to a second They must be as close to the devices as possible in threshold before the cycle is repeated. order to reduce losses. See the PCB Layout section When several devices are connected together, all the for more details. 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. 8 Submit Documentation Feedback Copyright © 2000–2008, Texas Instruments Incorporated Product Folder Link(s): DCP02 Series |
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