BCDSEMI AP3842CP-E1

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.
·
·
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.
·
·
·
·
·
The AP3842C and AP3844C have UVLO thresholds
of 16V(on) and 10V(off); The corresponding thresholds for AP3843C and AP3845C are 8.4 V(on) and
7.6V(off).
·
The AP3842C and AP3843C can operate approaching
100% duty cycle; AP3844C and AP3845C can operate
from zero to 50% duty cycle.
·
·
·
·
·
·
Low Start-up Current: 50µA
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 Temperature Range: 2.5%
High PWM Frequency Stability under a Full Supply Voltage Range: 0.2%
Accurate Over-temperature Protection with Hysteresis
UVLO with Hysteresis
Applications
These ICs are available in SOIC-8 and DIP-8 packages.
Off-line Converter
DC-DC Converter
Voltage Adapter
CRT Monitor Power Supply
Desktop Power Supply
DVD/STB Power Supply
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
2
7
VCC
ISENSE
3
6
OUTPUT
RT/CT
4
5
GND
Figure 2. Pin Configuration of AP3842C/3C/4C/5C (Top View)
Pin Description
Pin Number
Pin Name
Function
1
COMP
2
VFB
The inverting input of the Error Amplifier. It is normally connected to the switching
power supply output through a resistor divider.
3
ISENSE
A voltage proportional to inductor current is connected to this input. The PWM uses
this information to terminate the output switch conduction.
4
RT/CT
The Oscillator frequency and maximum output duty cycle are programmed by connecting resistor RT to VREF and capacitor CT to ground. Operation to 500 kHz is possible.
5
GND
The combined control circuitry and power ground.
6
OUTPUT
7
VCC
The positive supply of the control IC.
8
VREF
This is the reference output. It provides charging current for capacitor CT through
resistor RT.
This pin is the Error Amplifier output and is made available for loop compensation.
This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are
sourced and sunk by this pin.
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
2
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Functional Block Diagram
VCC
7
34V
GND
UVLO
S/R
5
5V
REF
8
INTERNAL
BIAS
2.50V
VREF
GOOD
LOGIC
RT/CT
4
OSC
VFB
COMP
ISENSE
3
OUTPUT
(Note)
S
2R
2
1
6
T
OVER TEMP
PROTECT
ERROR
AMP
VREF
R
R
1V
CURRENT
SENSE
COMPARATOR
PWN
LATCH
Note: Toggle flip-flop used
for 3844C/45C only
Figure 3. Functional Block Diagram of AP3842C/3C/4C/5C
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
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Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Ordering Information
AP384XC
-
Circuit Type
E1: Lead Free
Blank: Tin Lead
Package
TR: Tape and Reel
Blank: Tube
M: SOIC-8
P: DIP-8
Package
Temperature Range
SOIC-8
-40 to 85oC
DIP-8
Part Number
Tin Lead
Marking ID
Lead Free
Tin Lead
Lead Free
Packing
Type
AP3842/3/4/5CM
AP3842/3/4/5CM-E1
3842/3/4/5CM
3842/3/4/5CM-E1
Tube
AP3842/3/4/5CMTR
AP3842/3/4/5CMTR-E1
3842/3/4/5CM
3842/3/4/5CM-E1
Tape & Reel
AP3842/3/4/5CP-E1
AP3842/3/4/5CP
AP3842/3/4/5CP-E1
-40 to 85oC AP3842/3/4/5CP
Tube
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
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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
±1
A
Analog Inputs
V(ANA)
-0.3 to 6.3
V
Error Amp Output Sink Current
ISINK(E.A)
10
mA
Power Dissipation at TA< 25 oC (DIP-8)
PD (Note 3)
1000
mW
Power Dissipation at TA<25 oC (SOIC-8)
PD (Note 3)
460
mW
TJ
-40 to 150
oC
140
oC/W
160
oC/W
TSTG
-65 to 150
oC
TLEAD
+300
oC
250
V
Junction Operating Temperature
DIP-8
RθJA
Thermal Resistance (Junction to Ambient)
SOIC-8
Storage Temperature Range
Lead Temperature (Soldering, 10sec)
ESD (Machine Mode)
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 indicated 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
Parameter
Oscillation Frequency
Ambient Temperature
Symbol
Min
f
TA
-40
Max
Unit
500
KHz
85
o
C
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
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Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Electrical Characteristics
(VCC=15V, RT=10kΩ CT=3.3nF, TA= -40 to 85oC, unless otherwise specified.)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
TJ=25oC, IREF=1mA
4.90
5.00
5.10
V
Line, Load, Temp.
4.82
REFERENCE SECTION
Reference Output Voltage
VREF
Total Output Variation
5.18
V
Line Regulation
∆VREF
12V ≤ VCC ≤25V
4
15
mV
Load Regulation
∆VREF
1mA ≤ IREF ≤20mA
4
15
mV
-100
-180
mA
0.2
0.4
mV/oC
52
57
KHz
Short Circuit Output Current
ISC
TA=25oC
Temperature Stability
OSCILLATOR SECTION
Oscillation Frequency
f
Oscillator Amplitude
VOSC
47
TJ=25oC
Pin 4, peak to peak (Note 6)
1.7
V
Temperature Stability
(Note 6)
2.5
%
Voltage Stability
12V ≤ VCC ≤ 25V
0.2
1
%
Discharge Current
Vpin 4 =2V(Note 7)
8.5
9.5
10.5
mA
VI
Vpin 1=2.5V
2.45
2.50
2.55
V
ISINK
Vpin1=1.1V
ERROR AMPLIFIER SECTION
Input Voltage
Output Sink Current
Output Source Current
ISOURCE
Vpin1=5V
High Output Voltage
VOH
RL=15kΩ to GND
Low Output Voltage
VOL
RL=15kΩ to pin 8
8
mA
-0.8
mA
5
7
V
0.7
1.1
V
2V ≤ VO ≤ 4V
65
90
dB
PSRR
12V ≤ VCC ≤ 25V
60
70
dB
VI(MAX)
Vpin1=5V(Note 4)
0.9
1
1.1
V
(Note 4, 5)
2.85
3
3.15
V/V
Voltage Gain
Power Supply Rejection Ratio
5
-0.5
CURRENT SENSE SECTION
Maximum Input Signal
Gain
Power Supply Rejection Ratio
GV
PSRR
Delay to Output
Input Bias Current
12V ≤ VCC ≤ 25V (Note 4, 6)
70
Vpin3 = 0 to 2V (Note 6)
150
300
ns
-3
-10
µA
ISINK = 20mA
0.1
0.4
V
ISINK = 200mA
1.4
2.2
V
IBIAS
dB
OUTPUT SECTION
Low Output Voltage
High Output Voltage
VOL
VOH
Rise Time
tR
Fall Time
tF
ISOURCE = 20mA
13
14
V
ISOURCE = 200mA
12
13
V
o
TJ=25 C, CL=1nF (Note 6)
TJ
=25oC,
CL=1nF (Note 6)
50
150
ns
50
150
ns
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
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Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Electrical Characteristics (Continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
AP3842C/AP3844C
15
16
17
V
AP3843C/AP3845C
7.8
8.4
9.0
V
VOPR
(Min.)
AP3842C/AP3844C
8.5
10.0
11.5
V
AP3843C/AP3845C
7.0
7.6
8.2
V
D(Max.)
AP3842C/AP3843C
95
97
100
%
D(Max.)
AP3844C/AP3845C
46
48
50
%
0
%
50
80
µA
8
12
mA
UNDER -VOLTAGE LOCKOUT SECTION
Start Threshold
VTH(ST)
Min. Operation Voltage
(After Turn On)
PWM SECTION
Max. Duty Cycle
Min. Duty Cycle
D(Min.)
TOTAL STANDBY CURRENT SECTION
Start-Up Current
IST
ICC(OPR)
Operating Supply Current
Zener Voltage
Vpin3=Vpin2=0V
ICC=25mA
VZ
30
34
V
OVER-TEMPERATURE PROTECT SECTION
Shutdown Temperature
TSHUT
(Note 6)
155
oC
Temperature Hysteresis
THYS
(Note 6)
25
oC
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 VREF, it contributes 0.3mA of current to the measured value.
So the total current flowing into the CT pin will be 0.3mA higher than the measured value approximately.
VREF
4.7k
1k
ERROR AMP
ADJUST
RT
1
COMP
2
VFB
A
VREF
8
VCC
7
VCC
100k
5k
4.7k
AP384XC
2N2222
ISENSE
ADJUST
0.1µF
3
ISENSE OUTPUT
6
4
RT/CT
GND
5
1K
1W
OUTPUT
0.1µF
GND
CT
Figure 4. Basic Test Circuit
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
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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
VCC=15V, IO=1mA
o
3.5
Saturation Voltage (V)
Reference Voltage (V)
5.010
5.005
5.000
4.995
4.990
VCC=15V, TA=25 C
3.0
2.5
2.0
1.5
1.0
0.5
4.985
0.0
4.980
-40
-0.5
-20
0
20
40
60
80
100
120
0
50
100
150
200
250
300
350
400
450
500
550
600
o
Ambient Temperature ( C)
Output Sink Current (mA)
Figure 7. Reference Voltage vs. Ambient Temperature
Figure 8. Output Saturation Characteristics
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
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Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Typical Performance Characteristics (Continued)
60
90
80
o
VCC=15V, TA=25 C
50
Start-up Current (µA)
Voltage Gain (dB)
70
60
50
40
30
40
30
20
10
0
10
100
1k
10k
100k
20
-40
1M
-20
0
20
40
60
80
100
120
o
Frequency (Hz)
Ambient Temperature ( C)
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
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Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Typical Application
NTC
Bridge Diode
1N4007*4
R19
10
C2
0.01µ
600V
+
R2
1M/
0.25W
J1
AC 90 to 265V
C1 47µ
C14
100µ/400V
R3
39k
2W
C15
2.2n
L3
10µ
T
D1
Byv26e
D3
8TQ100
R4 10
+
C10
1000µ
C11
1µ
R20
2K
Z2
SA12A
+
C9
2200µ
+
D2
1N4001
7
R12
100
Vcc
V
CC
J2
12V/5A
C3
0.1µ
VREF
8
R5
10k
2
C5
220p
VFB
1
COMP
5
GND
RT/CT
4
OUTPUT
6
ISENSE
3
C15
100p
R14
130k
U1
AP3842C/3C/4C/5C
R13
15k
R11
820
C4
3.3n
C8
0.22µ
R6
20
R7
1k
C6
2200p/600V
R16
8.2k
Q1
IRF830
U3
AZ431
C7
680p
Z1
1N5819
R15
100
W1
1k
R18
3.9k
R10
0.51/1W
R9
7.5k
R17
2k
U2 PC817
Figure 11. Typical Application of AP3842C/3C/4C/5C
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
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Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Mechanical Dimensions
SOIC-8
Unit: mm(inch)
4.800(0.189)
5.000(0.197)
7°
0.320(0.013)
1.350(0.053)
1.750(0.069)
8°
8°
7°
0.675(0.027)
0.725(0.029)
D
5.800(0.228)
1.270(0.050)
6.200(0.244)
TYP
D
20:1
0.300(0.012)
R0.150(0.006)
0.100(0.004)
φ 0.800(0.031)
0.200(0.008)
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)
R0.150(0.006)
0.190(0.007)
0.250(0.010)
BCD Semiconductor Manufacturing Limited
Sep. 2006 Rev. 1. 1
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Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Mechanical Dimensions (Continued)
DIP-8
Unit: mm(inch)
0.700(0.028)
7.620(0.300)TYP
1.524(0.060) TYP
6°
5°
6°
3.200(0.126)
3.600(0.142)
3.710(0.146)
4.310(0.170) 4°
4°
0.510(0.020)MIN
3.000(0.118)
3.600(0.142)
0.204(0.008)
0.360(0.014)
8.200(0.323)
9.400(0.370)
0.254(0.010)TYP
2.540(0.100) TYP
0.360(0.014)
0.560(0.022)
0.130(0.005)MIN
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
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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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