Features: Support improved conformance with energy conservationlaws by providing two operating modes. • Standby mode (light loads): Achieves better efficiency due to reduced frequency . • Normal mode: Achieves high efficiency in RCC local resonance operationwith zero-cross detection. I...
AN8027: Features: Support improved conformance with energy conservationlaws by providing two operating modes. • Standby mode (light loads): Achieves better efficiency due to reduced frequency . •...
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Support improved conformance with energy conservationlaws by providing two operating modes.
• Standby mode (light loads): Achieves better efficiency due to reduced frequency .
• Normal mode: Achieves high efficiency in RCC local resonance operationwith zero-cross detection.
Incorporating an input voltage compensation function available to a wide input range for worldwide use.
• This function compensates the maximum on-period in inverse proportion to the input voltage.
Incorporating a timer latch function.
• The time period can be adjusted according to the overload in normal mode or standby mode.
• This function makes it possible to protect the IC from damage that may be caused by the short-circuiting of
the IC's external capacitor for the timer.
Incorporating an overvoltage protection function. (detects at VCC pin)
Incorporating a pulse-by-pulse overcurrent protection function, which makes latch protection possible at the
time of the short-circuiting of the transformer's primary winding.
Adopting a 9-pin single inline package (E-9S: available to manufacturing in overseas).
AN8027: Transformer resetting is detected from the high- or low-level signal on the TR pin.
AN8037: Transformer resetting is detected from the falling edge of the high-level signal on the TR pin.
Refer to the "[1] operation descriptions 7. local resonance operation" section in the application notes.
Parameter | Symbol | Rating | Unit |
Supply voltage | VCC | 24 | V |
Constant output current | IOUT | ±150 | mA |
Peak output current | IOP | ±1 000 | mA |
TR pin allowable application current | ITR | ±5 | mA |
OCP pin allowable application voltage | VOCP | - 0.3 to +7.0 | V |
CLM pin allowable application voltage | VCLM | -0.3 to +7.0 | V |
SD pin allowable application voltage | VSD | - 0.3 to +7.0 | V |
FB pin allowable application current | IFB | 0 to -2.0 | mA |
Power dissipation (Ta25°C) | PD | 874 | mW |
Power dissipation (Ta = 85°C) | 454 | mW | |
Operating ambient temperature * | Topr | -30 t454o +85 | °C |
Storage temperature * | Tstg | -55 to +150 | °C |