|
|
PDF AN8027 Data sheet ( Hoja de datos )
| Número de pieza | AN8027 | |
| Descripción | AC-DC switching power supply control IC with standby mode | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AN8027 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
|
No Preview Available !
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.
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.
9
8
7
6
5
4
s Features
• Support improved conformance with energy conserva-
3
2
1
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 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.
s Applications
• Televisions, VCRs, facsimiles, and printers
1
1 page  
Voltage Regulators
AN8027, AN8037
s Pin Descriptions
Pin No. Pin name I/O
1 TR I
2 OCP
3 CF
Explanation
Transformer reset detection input. When the
IC detects transformer resetting and the fall-
ing edge of a high-level signal is input to
this pin of the AN8037 or a low-level signal
is input to the same pin of the AN8027, the
level of the Out pin becomes high. However,
the transformer reset signal is ignored if the
signal is shorter than the minimum off-pe-
riod determined by the CF pin. Also note
that the maximum on-period is corrected ac-
cording to the source currents.
Connection for the resistor that determines
the overload level of the IC to activate the
timer latch protection circuit.
By judging the operating mode (i.e., the nor-
mal or standby mode) of the IC from the
secondary side, the timer period is adjusted
with the selection of external resistance ac-
cording to the operating mode.
Connection for the capacitor that determines
the on- and off-periods of the IC output (Out).
The on- and off-periods are corrected by ION
which is proportional to the flowing out cur-
rent at the TR pin, and IOFF which corre-
sponds to the current at FB pin.
Equivalent Circuit
VREF
1
High-side Low-side
clamp clamp
VREF
Comp.
CF
2
VREF
IOFF
Comp.
VFB
3
ION
4 CLM I Input to the pulse-by-pulse overcurrent pro-
tection circuit.
VREF
Normally, we recommend adding an external
filter for this input. If overcurrent continues
Comp.
for several cycles, the IC determines that the
operation is erroneous, thus triggering the
latch protection function.
CLM(−) 4
5
GND
IC ground.
5
5
5 Page 
Voltage Regulators
s Application Notes (continued)
[1] Operation descriptions (continued)
3. Control waveform timing chart (continued)
2) Standby (Intermittent) mode (for light loads)
On
0V
(A)Voltage on bias winding
Off
Off
AN8027, AN8037
Off
(B)TR pin voltage
0V
4V
VFB voltage
2.4 V
(C)CF pin voltage
0V
(D)Out pin voltage
0V
Off
TON is acceptable
only after CF pin
voltage reaches 4 V.
TOFF(min)
T(OFF)
On On
Off Off
Current on
bias winding
0A
(E)Current
on primary
winding
(F)Current
on secondary
winding
TON is unacceptable
during TOFF(min) period.
<Circuit diagram>
(B)
AN8027,
CLM
ATCNRF8037VOCuCt
(C)
(D)
(E)
(A)
(G)
(F)
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet AN8027.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AN8021L | AC-DC switching power supply control IC | Panasonic Semiconductor |
| AN8021NS | External excitation flyback AC-DC switching power supply control IC | Panasonic Semiconductor |
| AN8021SB | AC-DC switching power supply control IC | Panasonic Semiconductor |
| AN8022L | AC-DC switching power supply control IC | Panasonic Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |