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PDF AZ3842 Data sheet ( Hoja de datos )
| Número de pieza | AZ3842 | |
| Descripción | (AZ3842 - AZ3845) CURRENT MODE PWM CONTROLLER | |
| Fabricantes | Advanced Analog Technology | |
| Logotipo |  |
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Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
General Description
Features
Data Sheet
AZ3842/3/4/5
The AZ3842/3/4/5 are high performance fixed fre-
quency current-mode PWM controller series.
These integrated circuits are optimized for off-line and
DC-DC converter applications with minimum external
components. They feature under-voltage lockout
(UVLO) circuit for low start-up current, trimmed
oscillator for precise duty cycle control, current sense
comparator providing maximum current limiting and a
totem pole output stage for increasing output current.
In addition, these ICs also feature accurate protection
against over-temperature, over-current and maximal
output power.
The AZ3842 and AZ3844 have UVLO thresholds of
15.5V(on) and 10V(off); The corresponding thresholds
for AZ3843 and AZ3845 are 8.4 V(on) and 7.8V(off).
· Robust VREF Line/Load Regulation
Low Line Regulation : 4mV
Low Load Regulation : 4mV
· High Stability of Reference Voltage over a Full
Temperature Range: 0.2mV/ oC
· Operating Frequency up to 500KHz
· High PWM Frequency Stability over a Full Tem-
perature Range: 2.5%
· High PWM Frequency Stability under a Full Sup-
ply Voltage Range: 0.2%
· Accurate Over-temperature Protection with Hys-
teresis
· UVLO with Hysteresis
Applications
The AZ3842 and AZ3843 can operate approaching · Off-line Converter
100% duty cycle; AZ3844 and AZ3845 can operate · DC-DC Converter
from zero to 50% duty cycle.
· Voltage Adapter
· CRT Monitor Power Supply
These ICs are available in 3 packages: SOIC-8, DIP-8 · Desktop Power Supply
and SOIC-14.
· DVD/STB Power Supply
March 2003
SOIC-8
DIP-8
SOIC-14
Figure 1. Package Types of AZ3842/3/4/5
1
Rev: 1.0
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Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Electrical Characteristics
(VCC=15V, RT=10kΩ CT=3.3nF, TA= -40oC to +85oC, unless otherwise specified.)
Parameter
Symbol
Conditions
Min
REFERENCE SECTION
Reference Output Voltage
Line Regulation
Load Regulation
Short Circuit Output Current
Temperature Stability
VREF
∆VREF
∆VREF
ISC
TJ=25oC, IREF=1mA
12V ≤ VCC ≤25V
1mA ≤ IREF ≤20mA
TA=25oC
4.90
Output Noise Voltage
(Note 6)
Long Term Stability
OSCILLATOR SECTION
TA=85oC, 1000 hours
Oscillation Frequency
Frequency Change with Voltage
Oscillator Amplitude
Temperature Stability
f
∆f/f
VOSC
TJ=25oC
12V ≤ VCC ≤ 25V
Pin 4, peak to peak (Note 6)
(Note 6)
47
ERROR AMPLIFIER SECTION
Input Bias Current
Input Voltage
Open Loop Voltage Gain
Power Supply Rejection Ratio
Output Sink Current
Output Source Current
High Output Voltage
Low Output Voltage
CURRENT SENSE SECTION
IBIAS
VI
AVOL
PSRR
ISINK
ISOURCE
VOH
VOL
(Note 6)
Vpin 1=2.5V
2V ≤ VO ≤ 4V
12V ≤ VCC ≤ 25V
Vpin2=2.7V, Vpin1=1.1V
Vpin2=2.3V, Vpin1=5V
Vpin2=2.3V, RL=15kΩ to GND
Vpin2=2.7V, RL=15kΩ to Pin 8
2.42
65
60
2
-0.5
5
Gain
GV (Note 4, 5)
2.85
Maximum Input Signal
Power Supply Rejection Ratio
Input Bias Current
Delay to Output
VI(MAX)
PSRR
IBIAS
Vpin1=5V(Note 4)
12V ≤ VCC ≤ 25V (Note 4, 6)
Vpin3 = 0 to 2V (Note 6)
0.9
OUTPUT SECTION
Low Output Voltage
High Output Voltage
Rise Time
VOL
VOH
tR
ISINK = 20mA
ISINK = 200mA
ISOURCE = 20mA
ISOURCE = 200mA
TJ=25oC, CL=1nF (Note 6)
13
12
March 2003
5
Data Sheet
AZ3842/3/4/5
Typ Max Unit
5.00 5.10
V
4 15 mV
4 15 mV
-100 -180
mA
0.2 0.4 mV/oC
50 µV
5 25 mV
52 57
0.2 1
1.7
2.5
KHz
%
V
%
-0.1 -2
2.50 2.58
90
70
4
-0.8
6
0.8 1.1
µA
V
dB
dB
mA
mA
V
V
3 3.15
1 1.1
70
-3 -10
150 300
V/V
V
dB
µA
ns
0.1 0.4
1.4 2.2
14
13
50 150
V
V
V
V
ns
Rev: 1.0
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Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Mechanical Dimensions (Continued)
SOIC-14
Data Sheet
AZ3842/3/4/5
7°
0.70
7°
8.65±0.10
0.2-+00..1005
A
0.38±0.10
×45°
8°
8°
4°±4°
9.5°
8° 3.90±0.10
0.42±0.09
1.00
1.27
1.55±0.20
6.00±0.20
A
20:1
0.25 (0.20min)
R0.20
R0.20
3°±2°
φ2.0
Depth 0.06～0.10
0.55±0.05
March 2003
DataSheet4 U .com
11
Rev: 1.0
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AZ3842.PDF ] | |
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