AN8027 Datasheet, PDF (1/28 Pages) Panasonic Semiconductor – AC-DC switching power supply control IC with standby mode

Voltage Regulators
AN8027, AN8037
AC-DC switching power supply control IC with standby mode
s Overview
The AN8027 and AN8037 are ICs developed for self-
excited switching regulator of RCC local resonance con-
2.4±0.25
6.0±0.3
3.3±0.25
Unit: mm
trol type.
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These ICs are designed to achieve stability and high
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efficiency over a wide input voltage range and loads range
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(light loads to heavy loads), for supporting input levels
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used worldwide and improved conformance with energy
5
conservation laws.
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s Features
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• Support improved conformance with energy conserva-
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tion laws by providing two operating modes.
• Standby mode (light loads):
Achieves better efficiency due to reduced frequency .
0.3
+0.1
–0.05
3.0±0.3
• Normal mode:
Achieves high efficiency in RCC local resonance op-
SIP009-P-0000C
eration with 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 V_CC 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.
s Applications
• Televisions, VCRs, facsimiles, and printers
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