概述
数据手册AZ3844 概述
CURRENT MODE PWM CONTROLLER 电流模式PWM控制器
AZ3844 数据手册
通过下载AZ3844数据手册来全面了解它。这个PDF文档包含了所有必要的细节，如产品概述、功能特性、引脚定义、引脚排列图等信息。
PDF下载Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
General Description
Features
The AZ3842/3/4/5 are high performance fixed fre-
quency current-mode PWM controller series.
·
Robust V
Line/Load Regulation
REF
Low Line Regulation : 4mV
Low Load Regulation : 4mV
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.
·
High Stability of Reference Voltage over a Full
o
Temperature Range: 0.2mV/ C
·
·
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
·
·
·
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).
Applications
·
·
·
·
·
·
Off-line Converter
DC-DC Converter
Voltage Adapter
CRT Monitor Power Supply
Desktop Power Supply
DVD/STB Power Supply
The AZ3842 and AZ3843 can operate approaching
100% duty cycle; AZ3844 and AZ3845 can operate
from zero to 50% duty cycle.
These ICs are available in 3 packages: SOIC-8, DIP-8
and SOIC-14.
SOIC-8
DIP-8
SOIC-14
Figure 1. Package Types of AZ3842/3/4/5
March 2003
Rev: 1.0
1
Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Pin Configuration
M Package
(SOIC-14)
P/M Package
(DIP-8/SOIC-8)
COMP
N/C
1
2
3
4
5
6
7
14
13
12
11
10
9
VREF
N/C
COMP
1
8
VREF
VFB
VCC
VFB
ISENSE
RT/CT
2
3
4
7
6
5
VCC
N/C
PWR VC
OUTPUT
GND
OUTPUT
GND
ISENSE
N/C
RT/CT
8
PWR GND
Figure 2. Pin Configuration of AZ3842/3/4/5 (Top View)
Pin Description
Pin Number
Pin Name
Function
8-pin
14-pin
1
2
1
3
COMP
VFB
This pin is the Error Amplifier output and is made available for loop compensation.
The inverting input of the Error Amplifier. It is normally connected to the switching
power supply output through a resistor divider.
3
4
5
7
ISENSE
RT/CT
A voltage proportional to inductor current is connected to this input. The PWM uses
this information to terminate the output switch conduction.
The Oscillator frequency and maximum Output duty cycle are programmed by con-
necting resistor RT to VREF and capacitor CT to ground. Operation to 500 kHz is pos-
sible.
5
6
GND
The combined control circuitry and power ground.
10
OUTPUT
This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A
are sourced and sunk by this pin.
7
8
12
14
VCC
The positive supply of the control IC.
VREF
This is the reference output. It provides charging current for capacitor CT through
resistor RT.
8
PWR GND
PWR VC
This pin is a separate power ground return that is connected back to the power source.
It is used to reduce the effects of switching transient noise on the control circuitry.
11
The Output high state (VOH) is set by the voltage applied to this pin. With a separate
power source connection, it can reduce the effects of switching transient noise on the
control circuitry.
9
GND
N/C
This pin is the control circuitry ground return and is connected back to the power
source ground.
2,4,6,13
No connection. These pins are not internally connected.
March 2003
Rev: 1.0
2
Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Functional Block Diagram
V
V
V
(PWR V )
CC C
CC
7(11)
8(14)
7(12)
5(9)
34V
UVLO
5V
REF
S/R
REF
GND
INTERNAL
BIAS
2.50V
VREF
GOOD
LOGIC
6(10) OUTPUT
4(7)
OSC
T
R /C
T
T
(Note)
OVER TEMP
PROTECT
GND
5(8)
(PWR GND)
ERROR
AMP
S
R
2R
V
2(3)
1(1)
FB
PWN
LATCH
A(B)
A for 8-pin
B for 14-pin
1V
R
CURRENT
SENSE
COMP
Note: Toggle flip-flop used
for 3844/45 only
3(5)
COMPARATOR
I
SENSE
Figure 3. Functional Block Diagram of AZ3842/3/4/5
Ordering Information
Package
Temperature Range
Part Number
Marking ID
Packing Type
SOIC-8
DIP-8
SOIC-14
AZ3842/3/4/5M
AZ3842/3/4/5P
AZ3842/3/4/5MM
3842/3/4/5M
AZ3842/3/4/5P
AZ3842/3/4/5MM
Tape/Reel/Tube
Tube
o
o
-40 C~85 C
Tape/Reel
March 2003
Rev: 1.0
3
Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Absolute Maximum Ratings (Note 1, 2)
Parameter
Symbol
Vcc
Value
30
Unit
V
Supply Voltage
Output Current
Io
A
土1
Analog Inputs (8-pin: pin2,3, 14-pin: pin3,5)
Error Amp Output Sink Current
V(ANA)
ISINK(E.A)
-0.3 to 6.3
10
V
mA
Power Dissipation at TA< 25 oC (DIP-8)
Power Dissipation at TA<25 oC (SOIC-8)
P
D (Note 3)
D (Note 3)
D (Note 3)
1000
460
mW
mW
mW
P
P
Power Dissipation at TA<25 oC (SOIC-14)
Storage Temperature Range
725
oC
oC
TSTG
-65 ~+150
+300
Lead Temperature (Soldering, 10sec)
TLEAD
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indi-
cated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended
periods may affect device reliability.
Note 2: All voltages are with respect to pin 5 and all currents are positive into specified terminal.
Note 3: Board thickness 1.6mm, board dimension 90mm x 90mm.
Recommended Operating Conditions
Symbol
Parameter
Min
Max
500
85
Unit
f
Oscillation Frequency
Ambient Temperature
KHz
o
TA
-40
C
March 2003
Rev: 1.0
4
Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Electrical Characteristics
o
o
(V =15V, R =10kΩ C =3.3nF, T = -40 C to +85 C, unless otherwise specified.)
CC
T
T
A
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
REFERENCE SECTION
Reference Output Voltage
Line Regulation
TJ=25oC, IREF=1mA
VREF
∆VREF
∆VREF
ISC
4.90
5.00
4
5.10
15
V
12V ≤ VCC ≤25V
mV
mV
mA
Load Regulation
1mA ≤ IREF ≤20mA
4
15
TA=25oC
Short Circuit Output Current
Temperature Stability
Output Noise Voltage
Long Term Stability
-100
0.2
50
5
-180
0.4
mV/oC
(Note 6)
µV
TA=85oC, 1000 hours
25
mV
OSCILLATOR SECTION
Oscillation Frequency
Frequency Change with Voltage
Oscillator Amplitude
Temperature Stability
ERROR AMPLIFIER SECTION
Input Bias Current
TJ=25oC
f
47
52
0.2
1.7
2.5
57
1
KHz
%
∆f/f
VOSC
12V ≤ VCC ≤ 25V
Pin 4, peak to peak (Note 6)
(Note 6)
V
%
IBIAS
VI
(Note 6)
-0.1
2.50
90
-2
µA
V
Input Voltage
Vpin 1=2.5V
2.42
65
60
2
2.58
Open Loop Voltage Gain
Power Supply Rejection Ratio
Output Sink Current
AVOL
PSRR
ISINK
ISOURCE
VOH
2V ≤ VO ≤ 4V
dB
dB
mA
mA
V
12V ≤ VCC ≤ 25V
70
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
4
Output Source Current
High Output Voltage
Low Output Voltage
-0.5
5
-0.8
6
VOL
0.8
1.1
V
CURRENT SENSE SECTION
Gain
GV
VI(MAX)
PSRR
(Note 4, 5)
2.85
0.9
3
1
3.15
1.1
V/V
V
Maximum Input Signal
Power Supply Rejection Ratio
Input Bias Current
Vpin1=5V(Note 4)
12V ≤ VCC ≤ 25V (Note 4, 6)
70
-3
dB
µA
ns
IBIAS
-10
Delay to Output
Vpin3 = 0 to 2V (Note 6)
150
300
OUTPUT SECTION
Low Output Voltage
ISINK = 20mA
0.1
1.4
14
0.4
2.2
V
V
V
V
ns
VOL
ISINK = 200mA
ISOURCE = 20mA
ISOURCE = 200mA
High Output Voltage
13
12
VOH
tR
13
TJ=25oC, CL=1nF (Note 6)
Rise Time
50
150
March 2003
Rev: 1.0
5
Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Electrical Characteristics (Continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
TJ=25oC, CL=1nF (Note 6)
Fall Time
tF
50
150
ns
UNDER -VOLTAGE LOCKOUT SECTION
Start Threshold
VTH(ST)
AZ3842/AZ3844
AZ3843/AZ3845
AZ3842/AZ3844
AZ3843/AZ3845
14.5
7.8
8.5
7.0
15.5
8.4
16.5
9.0
V
V
V
V
Min. Operation Voltage
(After Turn On)
VOPR
10.0
7.6
11.5
8.2
(Min.)
PWM SECTION
D(Max.)
D(Max.)
D(Min.)
AZ3842/AZ3843
AZ3844/AZ3845
93
46
95
48
100
50
0
%
%
%
Max. Duty Cycle
Min. Duty Cycle
TOTAL STANDBY CURRENT SECTION
Start-Up Current
IST
ICC(OPR)
VZ
0.6
10
34
1
mA
mA
V
Operating Supply Current
Zener Voltage
Vpin3=Vpin2=0V
ICC=25mA
14
30
OVER-TEMPERATURE PROTECT SECTION
oC
oC
Shutdown Temperature
Temperature Hysteresis
TSHUT
THYS
(Note 6)
(Note 6)
165
25
Note 4: Parameters are tested at trip point of latch with Vpin2 = 0.
Note 5: Here gain is defined as:
∆VPin 1
A=
, 0 ≤ Vpin3 ≤ 0.8V
∆VPin 3
Note 6: These parameters, although guaranteed, are not 100% tested in production.
VREF
RT
4.7k
2N2222
A
VCC
COMP
VFB
AZ3842
VREF
VCC
1
2
3
4
8
7
6
5
100k
1k
ERROR AMP
ADJUST
0.1µf
1K
1W
5k
ISENSE
ADJUST
ISENSE
RT/CT
OUTPUT
OUTPUT
GND
4.7k
GND
0.1µf
CT
Figure 4. Basic Test Circuit
March 2003
Rev: 1.0
6
Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Electrical Characteristics (Continued)
Figure 4 is the basic test circuit for AZ384x. In testing, the high peak currents associated with capacitive loads necessitate
careful grounding techniques. Timing and bypass capacitors should be connected close to pin 5 in a single point ground. The
transistor and 5k potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3.
Typical Performance Characteristics
100k
50K
30
10
3
1
10k
5K
0.3
100
1k
10k
100k
1M
1
10
100
22
47
2.2
4.7
Frequency (Hz)
Timing Capacitor (nF)
Figure 6. Timing Resistor vs. Frequency
Figure 5. Oscillator Dead Time vs. Timing Capacitor
1.0
0.9
0.8
0.7
0.6
0.5
0.4
5.015
VCC=15V, IO=1mA
5.010
AZ3842
5.005
5.000
4.995
4.990
4.985
4.980
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Ambient Temperature (oC)
Ambient Temperature (oC)
Figure 7. Reference Voltage vs. Ambient Temperature
Figure 8. Start-up Current vs. Ambient Temperature
March 2003
Rev: 1.0
7
Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Typical Performance Characteristics (Continued)
16
4.0
3.5
15
14
VCC=15V, TA=25oC
VCC=15V
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
13
12
11
10
9
8
7
6
-40
0
50 100 150 200 250 300 350 400 450 500 550 600
Output Sink Current (mA)
-20
0
20
40
60
80
100
120
Ambient Temperature (oC)
Figure 9. Supply Current vs. Ambient Temperature
Figure 10. Output Saturation Characteristics
90
80
VCC=15V, TA=25oC
70
60
50
40
30
20
10
0
10
100
1k
10k
100k
1M
Frequency (Hz)
Figure 11. Error Amplifier Open-loop Frequency Response
March 2003
Rev: 1.0
8
Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Typical Application
NTC
Bridge Diode
1N4007*4
C2
0.01µ
600V
R3
39k
2W
+
R2
100k
C14
100µ/400V
D3
8TQ100
L3
45µ
C11
1µ
C9
2200µ
C10
1000µ
C12
10µ
Z2
SA12A
J1
AC 220V
T
D1
+
+
Byv26e
C1 50µ
R4 100
D2
1N4148
J2
12V/5A
C3
0.1µ
7
2
1
5
8
VCC
VREF
C6
R12
500
R5
1k
2200p/600V
C4
10n
C8
0.22µ
VFB
RT/CT
4
6
3
R8
39k/2W
C5
220p
R6
10
R16
8.2k
R15
100
COMP OUTPUT
R14
130k
Q1
IRF820
D4
Byv26e
R7
1k
GND
ISENSE
W1
1k
U3
AZ431
R18
3.9k
C7
0.01µ
U1
AZ3842/3/4/5
R10
0.51/1W
R9
R13
15k
Z1
1N5819
7.5k
R17
2k
R11
820
U2 PS521
Figure 12. Typical Application of AZ3842/3/4/5
March 2003
Rev: 1.0
9
Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Mechanical Dimensions
SOIC-8
0.32
4.9±0.10
D
6.00±0.20
D
20:1
φ0.8
4°±4°
1.00
3°±2°
0.42±0.09
March 2003
Rev: 1.0
10
Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Mechanical Dimensions (Continued)
SOIC-14
0.38±0.10
×45°
A
5
+0.0
0.2
0
-0.1
4°±4°
0.70
8.65±0.10
3.90±0.10
1.55±0.20
0.42±0.09
1.27
A
20:1
0.25 (0.20min)
R0.20
R0.20
1.00
6.00±0.20
0.55±0.05
φ2.0
Depth 0.06～0.10
March 2003
Rev: 1.0
11
Data Sheet
AZ3842/3/4/5
Advanced Analog Circuits
CURRENT MODE PWM CONTROLLER
Mechanical Dimensions (Continued)
DIP-8
7.62±0.25
5°
9.2±0.10
6°
0.7
1.46±0.31
φ3×0.15±0.05
0.254
0.457
0.28±0.07
10.0MAX
2.54
0.13MIN
R0.75
March 2003
Rev: 1.0
12
Advanced Analog Circuits
http://www.aacmicro.com
USA: 860 Hillview Court, Suite 160, Milpitas, CA 95035, USA
China: 8th Floor, Zone B, 900 Yi Shan Road, Shanghai 200233, China
Tel: 408-586 8809, Fax: 408-586 8801
Tel: 86-21-6495 9539, Fax: 86-21-6485 9673
Taiwan: Room 2210, 22nd Fl, 333, Keelung Road, Sec. 1, Taipei 110, Taiwan Tel: 886-2-2758 6828, Fax: 886-2-2758 6892
IMPORTANT NOTICE
Advanced Analog Circuits Corporation reserves the right to make changes to its products or specifications at any time, without
notice, to improve design or performance and to supply the best possible product. Advanced Analog Circuits does not assume any
responsibility for use of any circuitry described other than the circuitry embodied in Advanced Analog Circuits' products. The
company makes no representation that circuitry described herein is free from patent infringement or other rights of Advanced
Analog Circuits Corporation.
AZ3844 相关器件
| 型号 | 制造商 | 描述 | 价格 | 文档 |
| AZ3844AM | DIODES | Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDSO8 | 获取价格 |
|
| AZ3844AM14 | DIODES | Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDSO14 | 获取价格 |
|
| AZ3844AM14-E1 | DIODES | Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDSO14 | 获取价格 |
|
| AZ3844AM14TR | DIODES | Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDSO14 | 获取价格 |
|
| AZ3844AM14TR-E1 | DIODES | Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDSO14 | 获取价格 |
|
| AZ3844AMTR | DIODES | Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDSO8 | 获取价格 |
|
| AZ3844AMTR-E1 | DIODES | Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDSO8 | 获取价格 |
|
| AZ3844AP | DIODES | Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDIP8 | 获取价格 |
|
| AZ3844AP-E1 | DIODES | Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDIP8 | 获取价格 |
|
| AZ3844BM | DIODES | Switching Regulator/Controller | 获取价格 |
|
AZ3844 相关文章
Bourns 密封通孔金属陶瓷微调电位计产品选型手册(英文版)
- 2024-09-20
- 6
Bourns 精密环境传感器产品选型手册(英文版)
- 2024-09-20
- 9
Bourns POWrTher 负温度系数(NTC)热敏电阻手册 (英文版)
- 2024-09-20
- 8
Bourns GMOV 混合过压保护组件产品选型手册(英文版)
- 2024-09-20
- 6
