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PDF CXA3812M Data sheet ( Hoja de datos )
| Número de pieza | CXA3812M | |
| Descripción | AC-DC Controller | |
| Fabricantes | Sony | |
| Logotipo |  |
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AC-DC Controller
CXA3812M
Description
The CXA3812M is the current resonant controller IC and has optimum configuration to realize various power
supply circuits easily and compactly.
(Applications: Power supply circuit, etc.)
Features
Overcurrent timer latch
Soft start function
Minimum frequency adjustment
Pulse overcurrent load detection
Adjacent 2-pin short protection
Various protection functions including overvoltage and overcurrent
Structure
BiCMOS silicon monolithic IC
Package
14-pin SOP
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license
by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating
the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
-1-
E10632A0Y
Free Datasheet http://www.Datasheet4U.com
1 page  
CXA3812M
Pin Description
Pin
No.
Symbol
I/O
Standard pin
voltage
1 xEN
I VCC to GND
Equivalent circuit
Description
VCC
1
Mode select
(GND connection: Normal
Nch operation, VCC connection:
Standby mode)
SGND
VREF to GND
2 VSENSE I During steady
state: 2.5 V
VREF
Pch
2
Operation start voltage input
(Connect to PFC output detection
Pch resistor.)
VREF
3 OFFADJ I VREF to GND
3
SGND
Nch
Operation stop voltage
adjustment and abnormal latch
Pch forcible input
SGND
4 FMIN
5 CS2
6 CS1
I 1.2 V
VREF
Nch
4
Minimum oscillation frequency
control
(Connect to minimum frequency
Pch
control resistor.)
SGND
VREF
I
I
VREF to –0.3 V
5
6
Pch
Pch
Overcurrent detection 2
Overcurrent detection 1
(Connect to current detection
resistor.)
SGND
-5-
Free Datasheet http://www.Datasheet4U.com
5 Page 
CXA3812M
Item
Specification ratings
(Ta = 27 C)
Min. Typ. Max.
Design guarantee ratings
(Ta = –25 to +85 C) (*1)
Min. Typ. Max.
Unit
Frequency control circuit (RT pin)
Maximum oscillation frequency 800
—
—
800
—
— kHz
Deadband width
270 300 330 270 300 330 ns
Clamp frequency magnification
during soft start
3.5
4.0
4.5
3.5
4.0
4.5 times
Minimum frequency adjustment circuit (FMIN pin)
Setting frequency 1
–3.0 % 46.1 +3.0 % –3.8 % (*2) 46.1 +3.0 % (*2) kHz
Setting frequency 2
–4.0 % 96.7 +4.0 % –4.7 % (*2) 96.7 +4.0 % (*2) kHz
Setting frequency 3
–5.0 % 144.1 +5.0 % –5.6 % (*2) 144.1 +5.0 % (*2) kHz
Constant current detection
threshold value
0.85 1.25 1.65
0.85
1.25
1.65 A
Overcurrent circuit (CS1 pin)
Positive side detection
0.209 0.220 0.231
0.209
0.220
0.231
V
Negative side detection
–0.295 –0.260 –0.235 –0.295 –0.260 –0.235 V
Overcurrent detection voltage
ratio for +B drop
10
15
20
10
15
20 %
Detection delay time
100 150 200 100 150 200 ns
Detection mask time
384 480 576 384 480 576 ns
Overcurrent detection circuit (CS2 pin)
Continuous load detection
voltage
0.158 0.175 0.193
0.158
0.175
0.193
V
Detection mask time
384 480 576 384 480 576 ns
Continuous load detection time
(10)
(10) s
*1 Ratings are design guarantee values within this temperature range.
*2 Specification values at room temperature may not be satisfied because of temperature dependence.
- 11 -
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11 Page | ||
| Páginas | Total 31 Páginas | |
| PDF Descargar | [ Datasheet CXA3812M.PDF ] | |
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