Witajcie. Mam ja telewizorek Thomson 40FS3013 (płyta MPLE31N65-2A REV 1.2), w którym spalił się tranzystor kluczujący w zasilaczu - MDF10N65B. Jako zamiennik dobrałem STP10NK80ZFP. Zakładam, że mosfet pociągnął za sobą układ scalony przetwornicy - RT7736B. Niestety nigdzie nie można go kupić. Najbliższy jaki udało mi się znaleźć to AP3103 (wydaje mi się, że ochrona przed zanikiem napięcia nie jest niezbędna). Pasują wyprowadzenia, zasilanie, częstotliwość pracy. Schematu tv też nie znalazłem, ale doszedłem, że monitorowane napięcie wyjściowe wynosi 12V. Wiem, że muszę usunąć wszystko co wychodzi z nóżki 3 i w to miejsce dać rezystor R7 = 100Ω do masy, żeby zapewnić wymaganą częstotliwość pracy 65kHz. Co zrobić z pinami feedback i sense, żeby przynajmniej wystartować bezpiecznie? Zwiększyć rezystor R15, przy transoptorze? Nowy tranzystor ma Rds(on) bardzo podobną do starego, ale nowy scalak ma mniejsze napięcie maks. na pinie sense (0,85V vs 1.1V). A może czegoś nie dostrzegam i dobrane komponenty nie będą działać?
Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
General Description
Features
The AP3103 is a low startup current, current mode
PWM controller with green-mode power-saving operation. The PWM switching frequency at normal operation is externally programmable and is trimmed to a
tight range. The dithering of frequency will improve
EMI feature. When the load decreases, the frequency
will reduce and when at a very low load, the IC will
enter the ‘skip mode’ to minimize switching loss.
About 20kHz frequency switching is able to avoid the
audible noise as well as reduce the standby loss.
·
·
·
·
·
·
·
AP3103
·
·
The AP3103 features a lot of functions such as the
Leading-Edge Blanking (LEB) of the current sensing,
internal slope compensation and several protection
functions including cycle-by-cycle current limit
(OCP), VCC Over Voltage Protection (VOVP), OTP,
OLP protection.
·
This IC is available in SOT-23-6 and DIP-8 packages.
·
Bi-CMOS Process with Excellent Performance
Very Low Start-up Current:( & lt; 15µA)
Current Mode Control
Non-audible-noise Green-mode Control
LEB (Leading-edge Blanking) on SENSE Pin
Internal Slope Compensation
Frequency Fold Back for High Average Efficiency
Soft Switching for Reducing EMI
Useful Pin Fault Protection:
SENSE Pin Floating
RI Pin Short to Ground
RI Pin Floating
FB/Opt-coupler Open/short
Comprehensive System Protection Feature:
VCC Over Voltage Protection (VOVP)
Over Temperature Protection (OTP)
Over Load Protection (OLP)
Mini Size with Packages
Applications
·
·
·
·
Switching AC-DC Adapter/Charger
ATX/BTX Auxiliary Power
Set-top Box(STB) Power Supply
Open Frame Switching Power Supply
SOT-23-6
DIP-8
Figure 1. Package Types of AP3103
Apr. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
1
Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
AP3103
Pin Configuration
K Package
(SOT-23-6)
P Package
(DIP-8)
Pin 1 Dot by Marking
GATE
6
2
5
3
4
7
FB
3
6
NC
SENSE
SENSE
2
4
5
RI
VCC
RI
GND
GATE
FB
8
NC
1
1
VCC
GND
Figure 2. Pin Configuration of AP3103 (Top View)
Pin Description
Pin Number
SOT-23-6
DIP-8
Pin Name
Function
1
8
GND
2
7
FB
Feedback. Directly connected to the opto-coupler
Signal ground. Current return for driver and control circuits
3
5
RI
Set the bias current to determine the normal switching frequency
4
4
SENSE
Current Sense
5
2
VCC
Supply voltage of driver and control circuits
6
1
GATE
Gate driver output
3, 6
NC
No connection. These pins are not internally connected
Apr. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
AP3103
Functional Block Diagram
VCC
5 (2)
15V
8.8V
35.5V
3 (5)
O/S
Protection
Internal Bias
& VREF
UVLO
28V
VCC
OTP
OVP
OLP
OVP
D
DFF
CLK SB
OSC
VDD
RI
17.5V
Driver
QB
6 (1)
GATE
140℃
OTP
0.6V
FB
2 (7)
Line
Compensation
1.1V
OLP
OCP
PWM
GND
1 (8)
FOCP
0.85 V
Soft
Start
250ns
LEB
4 (4)
SENSE
A (B)
A SOT-23-6
B DIP-8
Figure 3. Functional Block Diagram of AP3103
Apr. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
AP3103
Ordering Information
AP3103
G1: Green
Circuit Type
TR: Tape and Reel
Blank: Tube
Package
K: SOT-23-6
P: DIP-8
Package
SOT-23-6
DIP-8
Temperature Range
Part Number
Marking ID
AP3103KTR-G1
-40 to 85oC
GHL
AP3103P-G1
AP3103P-G1
Packing Type
Tape & Real
Tube
BCD Semiconductor's products, as designated with " G1 " suffix in the part number, are RoHS compliant and Green.
Apr. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
AP3103
Absolute Maximum Ratings (Note 1)
Parameter
Power Supply Voltage
Gate Output Current
Input Voltage to FB, SENSE pin
Symbol
Value
Unit
VCC
30
V
IO
300
mA
VFB, VSENSE
-0.3 to 7
V
SOT-23-6
250
DIP-8
100
SOT-23-6
500
DIP-8
1250
Thermal Resistance Junction to Ambient
θJA
Power Dissipation and Thermal Characteristic, SENSE at TA & lt; 25oC
PD
Operating Junction Temperature
TJ
-40 to150
TSTG
150
oC
ESD (Human Body Model)
3000
V
ESD (Machine Model)
300
V
Storage Temperature Range
o
C/W
mW
o
C
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.
Recommended Operating Conditions
Parameter
Supply Voltage
Ambient Operating Temperature Range
Symbol
Min
Max
Unit
VCC
10
25
V
TA
-40
85
o
Apr. 2011 Rev. 1. 4
C
BCD Semiconductor Manufacturing Limited
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Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
AP3103
Electrical Characteristics
VCC=16V, TA=25oC, unless otherwise specified.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
5
15
µA
Supply Voltage (VCC Pin)
Start-up Current
ISTART-UP
VCC=14.8V
VFB=0V, CL=1nF, RRI=100kΩ
1
2
3
VFB=3V, CL=1nF, RRI=100kΩ
0.65
1.65
2.65
UVLO (on)
13.9
15
16
V
UVLO (off)
7.8
8.8
9.8
V
VCC OVP
27
28
29
V
32
35.5
37
V
70
75
80
Operating Supply Current
ICC
VCC Clamp
ICC=5mA
mA
PWM Section/Oscillator Section
Maximum Duty Cycle
Minimum Duty Cycle
0
%
Oscillation Frequency
RRI=100kΩ
60
Green Mode Frequency
RRI=100kΩ
22
Frequency Temperature
Stability
-40oC to 85oC
5
%
Frequency Voltage Stability
VCC=12 to 30V
3
%
65
70
kHz
±6
Frequency Dithering
kHz
%
Current Sense Section (SENSE Pin)
Maximum SENSE Voltage
LEB Time of SENSE
VCS
VFB=3.3V, RRI=100kΩ, D=50%
RRI=100kΩ
0.850
0.900
0.65
150
250
350
50
Delay to Output
Soft-start Time
0.800
VFB=3.3V, RRI=100kΩ, D=2.6%
150
250
RRI=100kΩ
0.5
V
ns
ns
ms
Feedback Input Section (FB Pin)
The Ratio of Input Voltage
to Current Sense Voltage
2.5
Source Current
V/V
4.5
6
kΩ
-0.5
-1
-1.5
mA
1.2
VFB=0V
Input Voltage for Zero Duty
3.5
3
Input Impedance
3
1.5
1.8
V
Output Section (GATE Pin)
Output Low Level
IO=20mA, VCC=12V
Output High Level
IO=20mA, VCC=12V
Output Clamping
1
8
V
V
16
17.5
19
V
Rising Time
CL=1nF, VCC=13V
120
220
320
ns
Falling Time
CL=1nF, VCC=13V
30
50
90
ns
Apr. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
AP3103
Electrical Characteristics
VCC=16V, TA=25oC, unless otherwise specified.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Over Temperature Protection Section
Shutdown Temperature
140
Temperature Hysteresis
20
oC
o
C
Delay Time Section
Delay 1 of Protection
OLP, RRI=100kΩ
35
ms
Delay 2 of Protection
VCC OVP, RRI=100kΩ
25
µs
Apr. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
AP3103
Typical Performance Characteristics
9.8
15.4
9.6
15.2
9.4
Shutdown Voltage (V)
Start-up Voltage (V)
15.0
14.8
14.6
14.4
14.2
14.0
9.2
9.0
8.8
8.6
8.4
8.2
13.8
8.0
13.6
-40
-20
0
20
40
60
80
100
120
7.8
-60
140
-40
-20
o
20
40
60
80
100
120
140
160
Ambient Temperature ( C)
Figure 5. Shutdown Voltage vs. Ambient Temperature
Figure 4. Start-up Voltage vs. Ambient Temperature
4.0
5.5
3.5
5.0
3.0
Operation Current (mA)
6.0
Start-up Current (µA)
0
o
Ambient Temperature ( C)
4.5
4.0
3.5
3.0
2.5
2.0
2.5
2.0
1.5
1.0
0.5
-40
-20
0
20
40
60
80
100
120
0.0
-40
o
Ambient Temperature ( C)
-20
0
20
40
60
80
100
120
140
o
Ambient Temperature ( C)
Figure 6. Start-up Current vs. Ambient Temperature
Figure 7. Operation Current vs. Ambient Temperature
Apr. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
AP3103
Typical Performance Characteristics (Continued)
28.4
75.0
72.5
28.2
28.0
67.5
fOSC (kHz)
VCC OVP (V)
70.0
27.8
65.0
62.5
60.0
27.6
57.5
27.4
-40
-20
0
20
40
60
80
100
120
55.0
-40
140
-20
0
20
40
60
80
100
120
140
o
o
Ambient Temperature ( C)
Ambient Temperature ( C)
Figure 9. fOSC vs. Ambient Temperature
Figure 8. VCC OVP vs. Ambient Temperature
Apr. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
Operation Description
The AP3103 is specifically designed for off-line ACDC power supply used in LCD monitor, notebook
adapter and battery charger applications. It offers a cost
effective solution with a versatile protection function.
Start-up Current and UVLO
pin, the relation between peak inductor current (IPK)
and VFB is:
I PK = (VFB − 0.8) / 3RS
Leading-edge Blanking
The start-up current of AP3103 is optimized to realize
ultra low current (5µA typical) so that VCC capacitor
can be charged more quickly. The direct benefit of low
start-up current is the availability of using large startup resistor, which minimizes the resistor power loss for
high voltage AC input.
An UVLO comparator is included in AP3103 to detect
the voltage on the VCC pin. It ensures that AP3103 can
draw adequate energy from hold-up capacitor during
power on. The turn-on threshold is 15V and the turnoff threshold is 8.8V.
Oscillator
The oscillation frequency is programmed by the value
of resistor R1, connected from pin RI to ground. The
resistor will make a constant current source to
determine the oscillation frequency by charging and
discharging an internal capacitor. Normally, RI pin
should not be placed where exists too much noise, as
the disturbance may make the IC work abnormally.
The oscillation frequency can be expressed as:
f ≈
AP3103
6500
( kHz )
R1( kΩ )
A narrow spike on the leading edge of the current
waveform can usually be observed when the power
MOSFET is turned on. A 250ns leading-edge blank is
built-in to prevent the false-triggering caused by the
turn-on spike. During this period, the current limit
comparator is disabled and the gate driver can not be
switched off.
FB Pin and Short Circuit Protection
This pin is normally connected to the opt-coupler and
always paralleled with a capacitor for loop
compensation. When the voltage at this pin is great
than 4.2V (such as output short to ground or the optcoupler is broken) and lasts for about 25ms, the IC will
enter the protection mode. For AP3103, the system will
enter hiccup mode to wait the VCC decreasing to low
UVLO level, then the IC will try to restart until the
failure removed. And when this voltage is less than
1.5V, the IC will stop the drive pulse immediately.
Therefore, this feature can be used for short circuit
protection, which makes the system immune from
catastrophic failure. Normally, output short makes the
VFB value to the maximum because the opt-coupler is
cut off.
System Protection and Pin Fault
Protection
The recommended oscillation frequency is 50 to 100
kHz from the EMI consideration.
Current Sense Comparator and PWM
Latch
The AP3103 operates as a current mode controller; the
output switch conduction is initiated by every
oscillator cycle and is terminated when the peak
inductor current reaches the threshold level established
by the FB pin. The inductor current signal is converted
to a voltage signal by inserting a reference sense
resistor RS. The inductor current under normal
operating conditions is controlled by the voltage at FB
Apr. 2011 Rev. 1. 4
The AP3103 provides versatile system and pin fault
protections. The OCP comparator realizes the cycleby-cycle current limiting (OCP).In universal input line
voltage, the IC realizes the constant over load
protection (OLP). VCC over voltage protection can be
applied as the primary OVP or opt-coupler broken
protection. The AP3103 also has pin fault connection
protection including floating and short connection. The
floating pin protection include the RI, SENSE, FB, etc;
The short pin protection includes the RI pin short
protection. When these pins are floated or RI pin is
shorted to ground, PWM switching will be disabled,
thus protecting the power system.
BCD Semiconductor Manufacturing Limited
10
Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
AP3103
Typical Application
L2
+
T1
R6
R4
C2
C6
C5
R13
C7
C8
~
-
R5
~
R19
C4
NTC
R2
C3
U1
R14
R8
R3
VCC
GATE
R10
R9
SENSE
C1
RI
F1
VR1
R11
AP3103
R16
R12
R17
U2
AZ431
FB
R7
R15
C10
C11
GND
C9
R18
~
Figure 10. Typical Application of AP3103
Apr. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
AP3103
Mechanical Dimensions
SOT-23-6
Unit: mm(inch)
0°
2.820(0.111)
8°
3.020(0.119)
0.300(0.012)
0.400(0.016)
0.200(0.008)
0.300(0.012)
0.600(0.024)
5
4
1.500(0.059)
1.700(0.067)
2.650(0.104)
2.950(0.116)
6
P i 1 D ot by M arki
n
ng
1
2
3
0.700(0.028)REF
0.950(0.037)TYP
0.000(0.000)
0.150(0.006)
1.800(0.071)
2.000(0.079)
0.100(0.004)
0.200(0.008)
0.900(0.035) 1.450(0.057)
MAX
1.300(0.051)
Apr. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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Data Sheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
AP3103
Mechanical Dimensions (Continued)
DIP-8
Unit: mm(inch)
0.700(0.028)
7.620(0.300)TYP
1.524(0.060) TYP
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
0.360(0.014)
0.560(0.022)
5°
6°
2.540(0.100) TYP
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)
Note: Eject hole, oriented hole and mold mark is optional.
Apr. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
13
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
IMPORTANT NOTICE
IMPORTANT NOTICE
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifiBCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any
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
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
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.
other rights nor the rights of others.
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