AP384XC [BCDSEMI]
CURRENT MODE PWM CONTROLLER; 电流模式PWM控制器
| 型号： | AP384XC |
| 厂家： | 
BCD SEMICONDUCTOR MANUFACTURING LIMITED |
| 描述： | CURRENT MODE PWM CONTROLLER |
| 文件： | 总13页 (文件大小：176K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
General Description
Features
The AP3842C/3C/4C/5C are high performance fixed
frequency current-mode PWM controller series.
·
Low Start-up Current: 50µA
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 AP3842C and AP3844C have UVLO thresholds
of 16V(on) and 10V(off); The corresponding thresh-
olds for AP3843C and AP3845C 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 AP3842C and AP3843C can operate approaching
100% duty cycle; AP3844C and AP3845C can operate
from zero to 50% duty cycle.
These ICs are available in SOIC-8 and DIP-8 pack-
ages.
DIP-8
SOIC-8
Figure 1. Package Types of AP3842C/3C/4C/5C
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
1
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Pin Configuration
P/M Package
(DIP-8/SOIC-8)
COMP
1
8
VREF
VFB
ISENSE
RT/CT
2
3
4
7
6
5
VCC
OUTPUT
GND
Figure 2. Pin Configuration of AP3842C/3C/4C/5C (Top View)
Pin Description
Pin Number
Pin Name
Function
1
2
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
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 possi-
ble.
5
6
GND
The combined control circuitry and power ground.
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
VCC
The positive supply of the control IC.
VREF
This is the reference output. It provides charging current for capacitor CT through
resistor RT.
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
2
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Functional Block Diagram
V
CC
7
5
34V
UVLO
5V
REF
S/R
V
8
REF
GND
INTERNAL
BIAS
2.50V
VREF
GOOD
LOGIC
OUTPUT
6
4
OSC
T
R /C
T
T
(Note)
OVER TEMP
PROTECT
ERROR
AMP
S
R
2R
2
1
V
PWN
LATCH
FB
1V
R
COMP
CURRENT
SENSE
COMPARATOR
Note: Toggle flip-flop used
for 3844C/45C only
3
I
SENSE
Figure 3. Functional Block Diagram of AP3842C/3C/4C/5C
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
3
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Ordering Information
AP384XC
-
E1: Lead Free
Blank: Tin Lead
Circuit Type
TR: Tape and Reel
Blank: Tube
Package
M: SOIC-8
P: DIP-8
Part Number
Marking ID
Tempera-
ture Range
Packing
Type
Package
Tin Lead
Lead Free
AP3842/3/4/5CM-E1
Tin Lead
Lead Free
3842/3/4/5CM-E1
3842/3/4/5CM-E1
AP3842/3/4/5CP-E1
AP3842/3/4/5CM
3842/3/4/5CM
3842/3/4/5CM
AP3842/3/4/5CP
Tube
Tape & Reel
Tube
-40 to 85oC
-40 to 85oC
SOIC-8
DIP-8
AP3842/3/4/5CMTR AP3842/3/4/5CMTR-E1
AP3842/3/4/5CP AP3842/3/4/5CP-E1
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
4
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
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
V(ANA)
V
Error Amp Output Sink Current
I
SINK(E.A)
mA
Power Dissipation at TA< 25 oC (DIP-8)
PD (Note 3)
PD (Note 3)
TJ
1000
460
mW
mW
Power Dissipation at TA<25 oC (SOIC-8)
Junction Operating Temperature
DIP-8
oC
oC/W
oC/W
oC
-40 to 150
140
R
Thermal Resistance (Junction to Ambient)
SOIC-8
θJA
160
Storage Temperature Range
Lead Temperature (Soldering, 10sec)
ESD (Machine Mode)
TSTG
-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
Sep. 2006 Rev. 1. 1
5
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Electrical Characteristics
o
(V =15V, 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
4.82
5.00
5.10
5.18
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
9.5
57
KHz
V
VOSC
Pin 4, peak to peak (Note 6)
(Note 6)
%
1
%
12V ≤VCC ≤25V
Discharge Current
Vpin 4 =2V(Note 7)
8.5
10.5
mA
ERROR AMPLIFIER SECTION
Input Voltage
VI
ISINK
ISOURCE
VOH
Vpin 1=2.5V
2.45
5
2.50
8
2.55
1.1
V
mA
mA
V
Output Sink Current
Output Source Current
High Output Voltage
Low Output Voltage
Voltage Gain
Vpin1=1.1V
Vpin1=5V
-0.5
5
-0.8
7
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 4)
0.9
1
3
1.1
V
V/V
dB
ns
(Note 4, 5)
2.85
3.15
Power Supply Rejection Ratio
Delay to Output
PSRR
12V ≤ VCC ≤ 25V (Note 4, 6)
Vpin3 = 0 to 2V (Note 6)
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 6)
TJ=25oC, CL=1nF (Note 6)
Rise Time
Fall Time
tR
tF
150
150
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
6
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Electrical Characteristics (Continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
UNDER -VOLTAGE LOCKOUT SECTION
Start Threshold
VTH(ST)
AP3842C/AP3844C
AP3843C/AP3845C
AP3842C/AP3844C
AP3843C/AP3845C
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.)
AP3842C/AP3843C
AP3844C/AP3845C
95
46
97
48
100
50
0
%
%
%
Max. Duty Cycle
Min. Duty Cycle
TOTAL STANDBY CURRENT SECTION
Start-Up Current
IST
ICC(OPR)
VZ
50
8
80
12
µA
mA
V
Operating Supply Current
Zener Voltage
Vpin3=Vpin2=0V
ICC=25mA
30
34
OVER-TEMPERATURE PROTECT SECTION
oC
oC
Shutdown Temperature
Temperature Hysteresis
TSHUT
THYS
(Note 6)
(Note 6)
155
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.
Note 7: 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
AP384XC
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
Sep. 2006 Rev. 1. 1
7
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
ELectrical Characteristics (Continued)
Figure 4 is the basic test circuit for AP384XC. 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
Figure 5. Oscillator Dead Time vs. Timing Capacitor
Figure 6. Timing Resistor vs. Frequency
5.015
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
VCC=15V, IO=1mA
5.010
VCC=15V, TA=25oC
5.005
5.000
4.995
4.990
4.985
4.980
-40
-20
0
20
40
60
80
100
120
0
50 100 150 200 250 300 350 400 450 500 550 600
Output Sink Current (mA)
Ambient Temperature (oC)
Figure 7. Reference Voltage vs. Ambient Temperature
Figure 8. Output Saturation Characteristics
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
8
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Typical Performance Characteristics (Continued)
60
50
40
30
20
90
80
70
60
50
40
30
20
10
0
VCC=15V, TA=25oC
-40
-20
0
20
40
60
80
100
120
10
100
1k
10k
100k
1M
Ambient Temperature (oC)
Frequency (Hz)
Figure 9. Error Amplifier Open-Loop Frequency Response
Figure 10. Start-up Current vs. Ambient Temperature
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
9
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Typical Application
NTC
Bridge Diode
1N4007*4
R19
10
C2
0.01µ
600V
R3
39k
2W
+
C15
2.2n
R2
1M/
0.25W
C14
100µ/400V
L3
10µ
C11
1µ
C10
1000µ
R20
2K
Z2
SA12A
J1
T
AC 90 to 265V
D1
Byv26e
+
+
D3
8TQ100
C1 47µ
C9
2200µ
R4 10
D2
1N4001
J2
12V/5A
C3
0.1µ
7
2
1
5
8
VCC
VREF
R12
100
R5
10k
C4
3.3n
C8
VFB
RT/CT
4
6
3
C5
0.22µ
C15
100p
220p
R6
20
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
AP3842C/3C/4C/5C Z1
1N5819
R10
0.51/1W
R9
7.5k
R13
15k
R17
2k
R11
820
U2 PC817
Figure 11. Typical Application of AP3842C/3C/4C/5C
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
10
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Mechanical Dimensions
SOIC-8
Unit: mm(inch)
4.800(0.189)
0.320(0.013)
1.350(0.053)
5.000(0.197)
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
Sep. 2006 Rev. 1. 1
11
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
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
Sep. 2006 Rev. 1. 1
12
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cations 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 Limited does not convey any license under its patent rights or
other rights nor the rights of others.
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