uc3875dwp 

 相移諧振控制器

 深圳輝騰達電子原裝現貨，絕對優勢。

產品信息

特性

• 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

說明

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 combination 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.

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