IW1678 - iWatt

IW1678 Low-Power Off-line Digital Green-Mode PWM Controller

●● Primary-side feedback eliminates opto-isolators and simplifies design ●● 64-kHz PWM switching frequency ●● No-load power consumption < 100 mW at 230 Vac with tight dynamic load transient response ●● Able to meet < 30 mW no-load power consumption with large value pre-load resistor ●● Adaptive multi-mode PWM/PFM control improves efficiency ●● Quasi-resonan.

Features

2.0 Description
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● Primary-side feedback eliminates opto-isolators and simplifies design
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● 64-kHz PWM switching frequency
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● No-load power consumption < 100 mW at 230 Vac with tight dynamic load transient response
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● Able to meet < 30 mW no-load power consumption with large value pre-load resistor
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● Adaptive multi-mode PWM/PFM control improves efficiency
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● Quasi-resonant operation for highest overall efficiency
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● EZ-EMI ® design to easily meet global EMI standards
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● Direct drive of low-cost BJT switch
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● Dynamic base current control
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● Very tight constant voltage and constant current re.