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PDF AX3842S Data sheet ( Hoja de datos )
| Número de pieza | AX3842S | |
| Descripción | High Performance Current Mode Pwm Controlers | |
| Fabricantes | Avantics | |
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AX3842P / AX3842S
High Performance Current Mode Pwm Controlers
Description
The AX3842 Series is high performance fixed frequency current mode controllers.
That is specifically designed for Off-Line and DC To DC converter applications
offering the designer a costeffective solution with minimal external components.
These integrated circuits feature a trimmed oscillator for precise duty cycle control.
A temperature compensated reference, high gain error amplifier, current sensing
compara-tor, and a high current totem pole output ideally suited for driving a
power MOSFET. Also included are protective features consisting of input and
reference undervoltage lockouts each with hysteresis, cycle-by-cycle current
limiting, programmable output deadtime, and a latch for single pulse metering.
Page No. : 1/12
8-Lead Plastic DIP-8
Package Code: P
•
8-Lead Plastic SO-8
Package Code: S
Features
• Trimmed Oscillator for Precise Frequency Control
• Oscillator Frequency Guaranteed at 250 kHz
• Current Mode Operation to 500 kHz
• Automatic Feed Forward Compensation
• Latching PWM for Cycle-By-Cycle Current Limiting
• Internally Trimmed Reference with Undervoltage Lockout
• High Current Totem Pole Output
• Undervoltage Lockout with Hysteresis
• Low Startup and Operating Current
Absolute Maximum Ratings
Symbol
Vi
Vi
IO
EO
Ptot
Tstg
TJ
TL
Parameter
Supply Voltage (low impedance source)
Supply Voltage (Ii<30mA)
Output Current
Output Energy (capacitive load)
Analog Inputs (pin 2, 3)
Error Amplifier Output Sink Current
Power Dissipation at Tamb≤25oC
Storage Temperature Range
Junction Operating Temperature
Lead Temperature (soldering 10s)
Value
30
Self Limiting
±1
5
-0.3 to 5.5
10
800
-65 to 150
-40 to 150
300
Unit
V
A
uJ
V
mA
mW
oC
oC
oC
Thermal Data
Symbol
Rth j-amb
Description
Thermal Resistance Junction-ambient
DIP-8
100
SO-8
150
Units
oC/W
AVANTICS - AX3842 Series
Specification No.: 050308-FE0008
1 page  
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Characteristics Curve
Oscillator Frequency & Timing Resistance
10000K
1000K
100K
CT=1.0nF
CT=2.2nF
CT=4.7nF
10K
1K
100
1000
10000
RT(Ω)
100000
Oscillator Discharge Current & Temperate
9
8.5
Vi=15V
Vosc=2V
8
7.5
7
-50 -25
0
25 50 75 100 125
TA (oC)
Current Sense Input Threshold & Error Amp
Output Voltage
1.2
Vcc=15V
1
0.8
0.6 Ta=25oC
0.4 Ta=125oC
Ta=-40oC
0.2
0
0 2 46 8
Vo (V)
AVANTICS - AX3842 Series
Page No. : 5/12
Maximum Duty Cycle & Timing Resistance
100
80
60
40
20
0
100
1000
10000
RT(Ω)
100000
Error Amp Open-Loop Gain and Phase &
Frequency
100 Φ
80
Gain
Vcc=15V
Vo=2V to 4V
RL=100K
Ta=25oC
30
60 60
40
Phase
90
20 120
0 150
-20
10
180
100 1000 10000 100000 1000000 10000000
f (Hz)
Reference Voltage Change & Source Current
60
50
Vcc=15V
40
30
20
Ta=125oC
Ta=25oC
Ta=-40oC
10
0
0 20 40 60 80 100 120
Iref (mA)
Specification No.: 050308-FE0008
5 Page 
www.DataSheet4U.com
DIP-8 Dimension
87 65
1 2 34
A
B
F
J
C EG
α1 K
ID H
M
L
8-Lead DIP-8
Plastic Package
AVANTICS Package Code: P
SO-8 Dimension
AG
8 76 5
BC
Pin1 Index
23 4
I
H
D
E
Part A
F
J
K
Part A L
M
N
O
8-Lead SO-8 Plastic
Surface Mounted Package
AVANTICS Package Code: S
Page No. : 11/12
Marking:
Pb Free Mark
Pb-Free: " . " (Note)
Normal: None
AX
3842
P
Date Code
Control Code
Note: Green label is used for pb-free packing
Pin Style: 1.COMP 2.VFB 3.ISENSE 4.RT/CT
5.GND 6.Output 7.Vi 8.VREF
Material:
• Lead solder plating: Sn60/Pb40 (Normal),
Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free)
• Mold Compound: Epoxy resin family,
flammability solid burning class: UL94V-0
DIM Min. Max.
A 6.29 6.40
B 9.22 9.32
C - *1.52
D - *1.27
E - *0.99
F 3.25 3.35
G 3.17 3.55
H 0.38 0.53
I 2.28 2.79
J 7.49 7.74
K - *3.00
L 8.56 8.81
M 0.229 0.381
α1 94o 97o
*: Typical, Unit: mm
Marking:
Pb Free Mark
Pb-Free: " . " (Note)
Normal: None
AX
3842
Pin 1 Index
Date Code
S
Control Code
Note: Green label is used for pb-free packing
Pin Style: 1.COMP 2.VFB 3.ISENSE 4.RT/CT
5.GND 6.Output 7.Vi 8.VREF
Material:
• Lead solder plating: Sn60/Pb40 (Normal),
Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free)
• Mold Compound: Epoxy resin family,
flammability solid burning class: UL94V-0
DIM Min. Max.
A 4.85 5.10
B 3.85 3.95
C 5.80 6.20
D 1.22 1.32
E 0.37 0.47
F 3.74 3.88
G 1.45 1.65
H 4.80 5.10
I 0.05 0.20
J 0.30 0.70
K 0.19 0.25
L 0.37 0.52
M 0.23 0.28
N 0.08 0.13
O 0.00 0.15
*: Typical, Unit: mm
Important Notice:
• All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of AVANTIC.
• AVANTICS reserves the right to make changes to its products without notice.
• AVANTICS semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.
• AVANTICS assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
Head Office:
• AVANTICS Microelectronics Corp: No. 255, Cai Lun Rd. Zhangjiang Technology Industrial Park Pudong, Shanghai, China
Tel: 86-021-58955599 Fax: 86-021-58558038
AVANTICS - AX3842 Series
Specification No.: 050308-FE0008
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AX3842S.PDF ] | |
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