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UC1876 数据表(PDF) 1 Page - Texas Instruments |
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UC1876 数据表(HTML) 1 Page - Texas Instruments |
1 / 19 page UC1875/6/7/8 UC2875/6/7/8 UC3875/6/7/8 DESCRIPTION The UC1875 family of integrated circuits implements control of a bridge power stage by phase-shifting the switching of one half-bridge with respect to the other, allowing constant frequency pulse-width modulation in combi- nation with resonant, zero-voltage switching for high efficiency performance at high frequencies. This family of circuits may be configured to provide control in either voltage or current mode operation, with a separate over-current shutdown for fast fault protection. A programmable time delay is provided to insert a dead-time at the turn-on of each output stage. This delay, providing time to allow the resonant switching action, is independently controllable for each output pair (A-B, C-D). With the oscillator capable of operation at frequencies in excess of 2MHz, overall switching frequencies to 1MHz are practical. In addition to the stan- dard free running mode, with the CLOCKSYNC pin, the user may configure these devices to accept an external clock synchronization signal, or may lock together up to 5 units with the operational frequency determined by the fastest device. Protective features include an undervoltage lockout which maintains all out- puts in an active-low state until the supply reaches a 10.75V threshold. 1.5V hysteresis is built in for reliable, boot-strapped chip supply. Over-current protection is provided, and will latch the outputs in the OFF state within 70nsec of a fault. The current-fault circuitry implements full-cycle restart operation. (continued) Phase Shift Resonant Controller FEATURES • Zero to 100% Duty Cycle Control • Programmable Output Turn-On Delay • Compatible with Voltage or Current Mode Topologies • Practical Operation at Switching Frequencies to 1MHz • Four 2A Totem Pole Outputs • 10MHz Error Amplifier • Undervoltage Lockout • Low Startup Current –150µA • Outputs Active Low During UVLO • Soft-Start Control • Latched Over-Current Comparator With Full Cycle Restart • Trimmed Reference SLUS229B - JULY 1999 - REVISED JUNE 2004 BLOCK DIAGRAM UDG-95073 application INFO available |
类似零件编号 - UC1876 |
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类似说明 - UC1876 |
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