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PDF AN8038 Data sheet ( Hoja de datos )
| Número de pieza | AN8038 | |
| Descripción | AC-DC switching power supply control IC with RCC local resonance circuit for improved conformance with energy conservation laws | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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Voltage Regulators
AN8038, AN8038S
AC-DC switching power supply control IC
with RCC local resonance circuit for
improved conformance with
energy conservation laws
AN8038
Unit: mm
18
s Overview
The AN8038 and AN8038S are self-excited AC-DC
switching power supply control IC that adopt RCC local
resonance control. These ICs are designed to achieve high
efficiency over a wide range of loads (light loads at the
standby mode to heavy loads) for improved conformance
with energy conservation laws, and support input levels
used worldwide. They are particularly appropriate for use
in AV and OA equipments.
27
36
45
0.51 min.
6.3±0.3
3.8±0.25
(3.45)
3° to 15° 7.62±0.25
+0.1
0.15–0.05
DIP008-P-0300B
s Features
AN8038S
• Supports improved conformance with energy conser-
vation laws by providing two operating modes.
5.01±0.20
85
With external resistors, it is possible to set the operating
point at which the modes change over according to the
load power, as shown below.
1.Continuous (RCC) mode
High efficiency achieved with local resonance opera-
14
tion (zero cross detection).
2.Discontinuous mode (standby) mode
Reduced switching loss and standby power due to re-
duced frequency
• Input voltage correction function. This function corrects
the maximum on-period in a manner inversely propor-
(0.60)
1.27
0.10
0.40+–00..0150
Seating plane
SOP008-P-0225C
tional to the input voltage.
• Built-in overvoltage protection function (detects at VCC pin)
• Pulse-by-pulse overcurrent protection function (single detection per one cycle)
• Packages: 8-pin DIP ··· AN8038
8-pin SOP ··· AN8038S
Unit: mm
(1.05)
0° to10°
0.50±0.20
s Applications
• Facsimiles and other OA equipment
• Printers and other personal computer peripheral equipment
• AV equipment
1
1 page  
Voltage Regulators
AN8038, AN8038S
s Electrical Characteristics at VCC = 18 V, Ta = 25°C (continued)
• Design Reference Data
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Parameter
Symbol
Conditions
Min Typ
Low-voltage protection (U.V.L.O.)
start/stop supply voltage difference
∆VCC
5.4
Transformer reset (TR) detection
threshold hysteresis width
TR ∆VTH
0.1
Oscillator (CF) upper limit voltage
Oscillator (CF) lower limit voltage 1
Oscillator (CF) lower limit voltage 2
Maximum on-period
VCLH
VCFL1
VCFL2
tON(max)
Minimum off-period 1
tOFF(min)1
Minimum off-period 2
tOFF(min)2
Light-load oscillator frequency
fOSC2
Output rise time
Output fall time
TR output response time
CLM output response time
Circuit current during startup 2
tr
tf
tTR
tCLM
ISTART2
IIFB = − 0.5 mA, CF = 1 000 pF
IIFB = − 0.5 mA, CF = 1 000 pF
IIFB = − 0.2 mA, CF = 1 000 pF
IIFB = − 0.2 mA, CF = 1 000 pF
VTR = 0.1 V
IIFB = − 0.2 mA, CF = 1 000 pF
VTR = 0.1 V
IIFB = −1.3 mA, CF = 1 000 pF
ITR = −450 µA
IIFB = −1.3 mA, CF = 1 000 pF
ITR = −450 µA
10% to 90%, IOUT = 0 mA
10% to 90%, IOUT = 0 mA
Ta = −30°C to +85°C
100
4.2
1.0
0.1
12
2.6
67
15
40
20
400
100
190
Max
300
Unit
V
V
V
V
V
µs
µs
µs
kHz
ns
ns
ns
ns
µA
s Terminal Equivalent Circuits
Pin No.
Equivalent Circuit
1
VREF
7V
TR
1
High-side Low-side
clamp clamp
Description
TR:
Transformer reset detection input.
When a transformer reset is detected, i.e., a low
level is input to this pin, the IC output goes high.
However, the transformer reset signal is ignored
if the signal is shorter than the minimum off-
period determined by the CF pin. Also note that
the maximum on-period is corrected according
to the source current.
I/O
I
5
5 Page 
Voltage Regulators
s Application Notes (continued)
[2] Operation descriptions (continued)
2. Oscillator circuit (continued)
tON is reduced since ITR
increases when EIN is large. ITR
RTR1
RTR2
TR
IFB
PC
Current mirror
1:1
Current mirror
ITR = ION
5:1
20 kΩ
VFB
280 µA
typ.
ITR
ION
VCC
Out
GND
AN8038, AN8038S
EIN+
NP
NB
CCF
EIN−
CF pin voltage
4.2 V
Input voltage correction
EIN: larger
→ On-period: shorter
Control switching voltage VRSTB
Output monitoring voltage VFB
0V
VCC − 1.5 V
Out pin voltage
0V
On-period
Off-period
Figure 2. On-period block diagram and control waveforms
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet AN8038.PDF ] | |
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