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-
trol type.
These ICs are designed to achieve stability and high
efficiency over a wide input voltage range and loads range
(light loads to heavy loads), for supporting input levels
used worldwide and improved conformance with energy
conservation laws.
2.4±0.25
6.0±0.3
3.3±0.25
Unit: mm
8
0.5±0.1
7
23.3±0.3
6
5
4
1.5±0.25
1.5±0.25
1.4±0.3
s
Features
•
Support improved conformance with energy conserva-
tion laws by providing two operating modes.
0.3
+0.1
–0.05
• Standby mode (light loads):
3.0±0.3
Achieves better efficiency due to reduced frequency .
• Normal mode:
SIP009-P-0000C
Achieves high efficiency in RCC local resonance op-
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.
2
1
s
Applications
•
Televisions, VCRs, facsimiles, and printers
30°
3
2.54
9
1