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AZ3843BM14-E1 [DIODES]

Switching Regulator/Controller;
AZ3843BM14-E1
型号： AZ3843BM14-E1
厂家： DIODES INCORPORATED    DIODES INCORPORATED
描述：

Switching Regulator/Controller
文件： 总14页 (文件大小：189K)
中文：  中文翻译
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Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
General Description  
Features  
The AZ3842B/3B/4B/5B are high performance fixed  
frequency current-mode PWM controller series. The  
difference between AZ384XA and AZ384XB is that  
they have different start-up currents.  
·
·
Start-up Current: 0.30mA for AZ3842B/44B  
0.20mA for AZ3843B/45B  
Robust V  
Line/Load Regulation  
REF  
Low Line Regulation : 4mV  
Low Load Regulation : 4mV  
High Stability of Reference Voltage over a Full  
These integrated circuits are optimized for off-line and  
DC-DC converter applications with minimum external  
components. They feature under-voltage lockout  
(UVLO) circuit with 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.  
·
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 AZ3842B and AZ3844B have UVLO thresholds  
of 16V(on) and 10V(off); The corresponding thresh-  
olds for AZ3843B and AZ3845B are 8.4 V(on) and  
7.6V(off).  
Applications  
·
·
·
·
·
·
Off-line Converter  
DC-DC Converter  
Voltage Adapter  
CRT Monitor Power Supply  
Desktop Power Supply  
DVD/STB Power Supply  
The AZ3842B and AZ3843B can operate approaching  
100% duty cycle; AZ3844B and AZ3845B can operate  
from zero to 50% duty cycle.  
These ICs are available in 3 packages: SOIC-8, DIP-8  
and SOIC-14.  
SOIC-14  
SOIC-8  
DIP-8  
Figure 1. Package Types of AZ3842B/3B/4B/5B  
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
1
Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
Pin Configuration  
M14 Package  
(SOIC-14)  
P/M Package  
(DIP-8/SOIC-8)  
COMP  
N/C  
1
2
3
4
5
6
7
14  
VREF  
13  
12  
11  
10  
9
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 AZ3842B/3B/4B/5B (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 High Output Voltage (VOH) is set by the voltage applied to this pin. With a sepa-  
rate 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.  
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
2
Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
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  
OUTPUT  
6(10)  
5(8)  
4(7)  
OSC  
T
R /C  
T
T
(Note)  
GND  
(PWR GND)  
OVER TEMP  
PROTECT  
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
COMP  
CURRENT  
SENSE  
COMPARATOR  
Note: Toggle flip-flop used  
for 3844B/45B only  
3(5)  
I
SENSE  
Figure 3. Functional Block Diagram of AZ3842B/3B/4B/5B  
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
3
Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
Ordering Information  
AZ384XB  
-
E1: Lead Free  
Blank: Tin Lead  
Circuit Type  
TR: Tape and Reel  
Blank: Tube  
Package  
M: SOIC-8  
P: DIP-8  
M14: SOIC-14  
Part Number  
Marking ID  
Tempera-  
ture Range  
Packing  
Type  
Package  
Tin Lead  
Lead Free  
Tin Lead  
3842/3/4/5BM  
3842/3/4/5BM  
Lead Free  
AZ3842/3/4/5BM  
AZ3842/3/4/5BMTR  
AZ3842/3/4/5BM-E1  
3842/3/4/5BM-E1  
3842/3/4/5BM-E1  
Tube  
-40 to 85oC  
-40 to 85oC  
-40 to 85oC  
SOIC-8  
DIP-8  
AZ3842/3/4/5BMTR-E1  
Tape &  
Reel  
AZ3842/3/4/5BP  
AZ3842/3/4/5BP-E1  
AZ3842/3/4/5BP  
AZ3842/3/4/5BP-E1  
Tube  
Tube  
AZ3842/3/4/5BM14  
AZ3842/3/4/5BM14-E1  
AZ3842/3/4/5BM14 AZ3842/3/4/5BM14-E1  
SOIC-14  
AZ3842/3/4/5BM14TR AZ3842/3/4/5BM14TR-E1 AZ3842/3/4/5BM14 AZ3842/3/4/5BM14-E1  
Tape &  
Reel  
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.  
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
4
Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
Absolute Maximum Ratings (Note 1, 2)  
Parameter  
Symbol  
Value  
Unit  
Supply Voltage  
VCC  
30  
V
Output Current  
IO  
A
± 1  
-0.3 to 6.3  
10  
Analog Inputs (8-pin: pin2,3, 14-pin: pin3,5)  
Error Amp Output Sink Current  
V(ANA)  
V
I
SINK(E.A)  
mA  
Power Dissipation at TA< 25 oC (DIP-8)  
Power Dissipation at TA<25 oC (SOIC-8)  
P
P
P
D (Note 3)  
D (Note 3)  
D (Note 3)  
TJ  
1000  
460  
mW  
mW  
mW  
Power Dissipation at TA<25 oC (SOIC-14)  
Junction Operating Temperature  
725  
oC  
oC/W  
oC/W  
oC  
-40 to 150  
140  
Thermal Resistance (Junction to Ambient)  
DIP-8 Package  
SOIC-8 Package  
TSTG  
160  
Storage Temperature Range  
Lead Temperature (Soldering, 10sec)  
ESD (Machine Mode)  
-65 to 150  
+300  
oC  
V
TLEAD  
250  
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
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
5
Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
Electrical Characteristics  
o
(V =15V(Note 4), R =10kΩ C =3.3nF, T = -40 to 85 C, unless otherwise specified.)  
CC  
T
T
A
Parameter  
Symbol  
Conditions  
Min  
Typ  
Max  
Unit  
REFERENCE SECTION  
Reference Output Voltage  
Total Output Variation  
Line Regulation  
TJ=25oC, IREF=1mA  
Line, Load, Temp.  
12V ≤ VCC ≤25V  
VREF  
4.90  
4.9  
5.00  
5.10  
5.10  
15  
V
V
∆VREF  
∆VREF  
ISC  
4
4
mV  
mV  
mA  
Load Regulation  
1mA ≤ IREF ≤20mA  
15  
TA=25oC  
Short Circuit Output Current  
Temperature Stability  
OSCILLATOR SECTION  
Oscillation Frequency  
Oscillator Amplitude  
Temperature Stability  
Voltage Stability  
-100  
0.2  
-180  
0.4  
mV/oC  
TJ=25oC  
f
47  
52  
1.7  
2.5  
0.2  
57  
KHz  
V
VOSC  
Pin 4, peak to peak (Note 7)  
(Note 7)  
%
1
%
12V ≤VCC ≤25V  
Discharge Current  
Vpin 4 =2V(Note 8)  
8.5  
10.5  
mA  
ERROR AMPLIFIER SECTION  
Input Voltage  
VI  
Vpin 1=2.5V  
2.45  
2
2.50  
6
2.55  
1.1  
V
mA  
mA  
V
Output Sink Current  
Output Source Current  
High Output Voltage  
Low Output Voltage  
Voltage Gain  
ISINK  
Vpin1=1.1V  
ISOURCE  
VOH  
Vpin1=5V  
-0.5  
5
-0.8  
6
RL=15kΩ to GND  
RL=15kΩ to pin 8  
2V ≤ VO ≤ 4V  
12V ≤ VCC ≤ 25V  
VOL  
0.7  
90  
70  
V
65  
60  
dB  
dB  
Power Supply Rejection Ratio  
CURRENT SENSE SECTION  
Maximum Input Signal  
Gain  
PSRR  
VI(MAX)  
GV  
Vpin1=5V(Note 5)  
0.9  
1
3
1.1  
V
V/V  
dB  
ns  
(Note 5, 6)  
2.85  
3.15  
Power Supply Rejection Ratio  
Delay to Output  
PSRR  
12V ≤ VCC ≤ 25V (Note 5, 7)  
Vpin3 = 0 to 2V (Note 7)  
70  
150  
-3  
300  
-10  
Input Bias Current  
IBIAS  
µA  
OUTPUT SECTION  
Low Output Voltage  
ISINK = 20mA  
0.1  
1.4  
14  
13  
50  
50  
0.4  
2.2  
V
V
V
V
ns  
ns  
VOL  
ISINK = 200mA  
ISOURCE = 20mA  
ISOURCE = 200mA  
High Output Voltage  
13  
12  
VOH  
TJ=25oC, CL=1nF (Note 7)  
TJ=25oC, CL=1nF (Note 7)  
Rise Time  
Fall Time  
tR  
tF  
150  
150  
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
6
Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
Electrical Characteristics (Continued)  
Parameter  
Symbol  
Conditions  
Min  
Typ  
Max  
Unit  
UNDER -VOLTAGE LOCKOUT SECTION  
Start Threshold  
VTH(ST)  
AZ3842B/AZ3844B  
AZ3843B/AZ3845B  
AZ3842B/AZ3844B  
AZ3843B/AZ3845B  
15  
7.8  
8.5  
7.0  
16  
8.4  
17  
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.)  
AZ3842B/AZ3843B  
AZ3844B/AZ3845B  
95  
46  
97  
48  
100  
50  
0
%
%
%
Max. Duty Cycle  
Min. Duty Cycle  
TOTAL STANDBY CURRENT SECTION  
Start-Up Current  
IST  
AZ3842B/AZ3844B  
AZ3843B/AZ3845B  
Vpin3=Vpin2=0V  
ICC=25mA  
0.3  
0.2  
10  
0.5  
0.4  
14  
mA  
mA  
mA  
V
Operating Supply Current  
Zener Voltage  
ICC(OPR)  
VZ  
30  
34  
OVER-TEMPERATURE PROTECT SECTION  
oC  
oC  
Shutdown Temperature  
Temperature Hysteresis  
TSHUT  
THYS  
(Note 7)  
(Note 7)  
155  
25  
Note 4: Adjust V above the start-up threshold before setting it to 15V.  
CC  
Note 5: Parameters are tested at trip point of latch with Vpin2 = 0.  
∆VPin 1  
Note 6: Here gain is defined as:  
A=  
, 0 ≤ Vpin3 ≤ 0.8V  
∆VPin 3  
Note 7: These parameters, although guaranteed, are not 100% tested in production.  
Note 8: This parameter is measured with RT=10kΩ to V it contributes 0.3mA of current to the measured value.  
REF,  
So the total current flowing into the CT pin will be 0.3mA higher than the measured value approximately.  
VREF  
RT  
AP384XB  
4.7k  
2N2222  
100k  
A
VCC  
1
2
3
4
VREF  
8
7
6
5
COMP  
1k  
VCC  
VFB  
ERROR AMP  
ADJUST  
1K  
1W  
0.1µF  
5k  
ISENSE  
ADJUST  
OUTPUT  
ISENSE  
OUTPUT  
GND  
4.7k  
0.1µF  
GND  
RT/CT  
CT  
Figure 4. Basic Test Circuit  
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
7
Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
Electrical Characteristics (Continued)  
Figure 4 is the basic test circuit for AZ384XB. 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  
1
10  
22  
100  
100  
1k  
10k  
100k  
1M  
47  
2.2  
4.7  
Frequency (Hz)  
Timing Capacitor (nF)  
Figure 5. Oscillator Dead Time vs. Timing Capacitor  
Figure 6. Timing Resistor vs. Frequency  
5.015  
0.35  
0.30  
0.25  
0.20  
0.15  
0.10  
VCC=15V, IO=1mA  
5.010  
5.005  
5.000  
4.995  
4.990  
4.985  
4.980  
AZ3842B/44B  
AZ3843B/45B  
-40  
-20  
0
20  
40  
60  
80  
100  
120  
-25  
0
25  
50  
75  
100  
125  
-40  
Ambient Temperature (oC)  
Ambient Temperature (oC)  
Figure 7. Reference Voltage vs. Ambient Temperature  
Figure 8. Start-up Current vs. Ambient Temperature  
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
8
Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
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  
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
9
Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
Typical Application  
NTC  
Bridge Diode  
1N4007*4  
C2  
2200p  
600V  
R3  
39k  
2W  
+
R2  
270k  
C14  
100µ/400V  
D3  
8TQ100  
L3  
4.5µ  
C11  
1µ  
C9  
2200µ  
C10  
1000µ  
C12  
10µ  
Z2  
SA12A  
J1  
AC 85-265V  
T
D1  
+
+
Byv26e  
C1 47µ  
R4 47  
D2  
1N4148  
J2  
12V/5A  
C3  
0.1µ  
7
2
1
5
8
VCC  
VREF  
R12  
10  
R5  
10k  
C4  
2.2n  
C8  
VFB  
RT/CT  
4
6
3
C5  
0.22µ  
C15  
100p  
220p  
R6  
10  
C6  
2200p/600V  
R16  
8.2k  
R15  
100  
COMP OUTPUT  
R14  
130k  
Q1  
IRF830  
R7  
1k  
GND  
ISENSE  
W1  
1k  
U3  
AZ431  
R18  
3.9k  
C7  
680p  
U1  
AZ3842B/3B/4B/5B Z1  
1N5819  
R10  
0.51/1W  
R9  
7.5k  
R13  
15k  
R17  
2k  
R11  
820  
U2 PC817  
Figure 12. Typical Application of AZ3842B/3B/4B/5B  
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
10  
Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
Mechanical Dimensions  
SOIC-8  
Unit: mm(inch)  
4.800(0.189)  
5.000(0.197)  
0.320(0.013)  
1.350(0.053)  
1.750(0.069)  
0.675(0.027)  
0.725(0.029)  
D
5.800(0.228)  
6.200(0.244)  
1.270(0.050)  
TYP  
D
20:1  
φ
0.800(0.031)  
0.200(0.008)  
0.100(0.004)  
0.300(0.012)  
0°  
8°  
1.000(0.039)  
3.800(0.150)  
4.000(0.157)  
1°  
5°  
0.330(0.013)  
0.510(0.020)  
0.900(0.035)  
6)  
00  
(0.  
50  
.1  
R0  
0.190(0.007)  
0.250(0.010)  
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
11  
Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
Mechanical Dimensions (Continued)  
SOIC-14  
Unit: mm(inch)  
0.280(0.011)  
0.480(0.019)×45°  
×45°  
A
0.700(0.028)  
0.100(0.004)  
0.250(0.010)  
0°  
8°  
8.550(0.337)  
8.750(0.344)  
3.800(0.150)  
4.000(0.157)  
0.330(0.013)  
0.510(0.020)  
1.270(0.050)  
A
0.250(0.010)  
20:1  
0.200(0.008)M  
IN  
R0.200(0.008)  
R0.200(0.008)  
0.500(0.020)  
0.600(0.024)  
0.250(0.010)  
2.000(0.079)  
Depth 0.060(0.002)  
0.100(0.004)  
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
12  
Preliminary Datasheet  
CURRENT MODE PWM CONTROLLER  
AZ3842B/3B/4B/5B  
Mechanical Dimensions (Continued)  
DIP-8  
Unit: mm(inch)  
0.700(0.028)  
7.620(0.300)TYP  
5°  
1.524(0.060) TYP  
6°  
3.200(0.126)  
3.600(0.142)  
3.710(0.146)  
4.310(0.170)  
0.510(0.020)MIN  
3.000(0.118)  
3.600(0.142)  
0.204(0.008)  
0.360(0.014)  
0.254(0.010)TYP  
8.200(0.323)  
9.400(0.370)  
2.540(0.100)TYP  
0.130(0.005)MIN  
0.360(0.014)  
0.560(0.022)  
6.200(0.244)  
6.600(0.260)  
R0.750(0.030)  
Φ3.000(0.118)  
Depth  
0.100(0.004)  
0.200(0.008)  
9.000(0.354)  
9.400(0.370)  
BCD Semiconductor Manufacturing Limited  
Apr. 2005 Rev. 1. 2  
13  
http://www.bcdsemi.com  
BCD Semiconductor Corporation  
3170 De La Cruz Blvd, Suite # 105 Santa Clara, CA 95054-2411, U.S.A  
Tel: +1-408-988 6388, Fax: +1-408-988 6386  
Tel: +86-21-6485-1491, Fax: +86-21-5450-0008  
Tel: +86-21-6495 9539, Fax: +86-21-6485 9673  
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.  
800 Yi Shan Road, Shanghai 200233, PRC  
Advanced Analog Circuits (Shanghai) Corporation  
8F, B Zone, 900 Yi Shan Road, Shanghai 200233, PRC  
BCD Semiconductor (Taiwan) Company Limited  
Room 2210, 22nd Fl, 333, Keelung Road, Sec. 1, TaiPei (110), Taiwan  
Tel: +886-2-2758 6828, Fax: +886-2-2758 6892  
IMPORTANT NOTICE  
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any pro-  
ducts or specifications herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for  
use of any its products for any particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any  
liability arising out of the application or use of any its products or circuits. BCD Semiconductor Manufacturing Limi-  
ted does not convey any license under its patent rights or other rights nor the rights of others.  

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