MC44603A
Enhanced Mixed Frequency
Mode GreenLinet PWM
Controller:
Fixed Frequency, Variable Frequency,
Standby Mode
The MC44603A is an enhanced high performance controller that is
specifically designed for off−line and dc−to−dc converter applications.
This device has the unique ability of automatically changing operating
modes if the converter output is overloaded, unloaded, or shorted,
offering the designer additional protection for increased system
reliability. The MC44603A has several distinguishing features when
compared to conventional SMPS controllers. These features consist of
a foldback facility for overload protection, a standby mode when the
converter output is slightly loaded, a demagnetization detection for
reduced switching stresses on transistor and diodes, and a high current
totem pole output ideally suited for driving a power MOSFET. It can
also be used for driving a bipolar transistor in low power converters
(< 150 W). It is optimized to operate in discontinuous mode but can
also operate in continuous mode. Its advanced design allows use in
current mode or voltage mode control applications.
Features
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MARKING
DIAGRAMS
16
MC44603AP
AWLYYWWG
16
1
PDIP−16
1
P SUFFIX
CASE 648
16
MC44603ADW
AWLYYWWG
1
•
Pb−Free Packages are Available*
Current or Voltage Mode Controller
16
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Operation up to 250 kHz Output Switching Frequency
Inherent Feed Forward Compensation
Latching PWM for Cycle−by−Cycle Current Limiting
Oscillator with Precise Frequency Control
Externally Programmable Reference Current
Secondary or Primary Sensing7
Synchronization Facility
High Current Totem Pole Output
Undervoltage Lockout with Hysteresis
Overvoltage Protection Against Open Current and Open Voltage Loop
Protection Against Short Circuit on Oscillator Pin
Fully Programmable Foldback
Soft−Start Feature
Accurate Maximum Duty Cycle Setting
Demagnetization (Zero Current Detection) Protection
Internally Trimmed Reference
Enhanced Output Drive
Low Startup and Operating Current
Fully Programmable Standby Mode
Controlled Frequency Reduction in Standby Mode
Low dV/dT for Low EMI Radiations
SOIC−16
DW SUFFIX
CASE 751G
1
High Flexibility
A
WL
YY
WW
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
V
CC
V
C
Output
GND
Foldback Input
Overvoltage
Protection (OVP)
Current Sense Input
Demag Detection
1
2
3
4
5
6
7
8
16 R
ref
R
Frequency
Standby
Voltage Feedback
14
Input
15
13 Error Amp Output
12 R
Power Standby
11
Soft−Start/D
max
/
Voltage Mode
Safety/Protection Features
10 C
T
9
Sync Input
(Top View)
GreenLine Controller: Low Power Consumption in Standby Mode
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 21 of this data sheet.
*For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
©
Semiconductor Components Industries, LLC, 2005
1
November, 2005 − Rev. 4
Publication Order Number:
MC44603A/D
MC44603A
MAXIMUM RATINGS
Rating
Total Power Supply and Zener Current
Supply Voltage with Respect to Ground (Pin 4)
Output Current (Note 1)
Source
Sink
Output Energy (Capacitive Load per Cycle)
R
F Stby
, C
T
, Soft−Start, R
ref
, R
P Stby
Inputs
Foldback Input, Current Sense Input,
E/A Output, Voltage Feedback Input,
Overvoltage Protection, Synchronization Input
Synchronization Input
High State Voltage
Low State Reverse Current
Demagnetization Detection Input Current
Source
Sink
Error Amplifier Output Sink Current
Power Dissipation and Thermal Characteristics
P Suffix, Dual−In−Line, Case 648
Maximum Power Dissipation at T
A
= 85°C
Thermal Resistance, Junction−to−Air
DW Suffix, Surface Mount, Case 751G
Maximum Power Dissipation at T
A
= 85°C
Thermal Resistance, Junction−to−Air
Operating Junction Temperature
Operating Ambient Temperature
P
D
R
qJA
T
J
T
A
0.45
145
150
−25 to +85
W
°C/W
°C
°C
P
D
R
qJA
0.6
100
W
°C/W
I
demag−ib (Source)
I
demag−ib (Sink)
I
E/A (Sink)
−4.0
10
20
mA
V
IH
V
IL
V
CC
+ 0.3
−20
V
mA
mA
I
O(Source)
I
O(Sink)
W
V
in
V
in
−0.3 to V
CC
+ 0.3
−750
750
5.0
−0.3 to 5.5
mJ
V
V
Symbol
(I
CC
+ I
Z
)
V
C
V
CC
Value
30
18
Unit
mA
V
mA
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. ESD data available upon request.
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2
MC44603A
ELECTRICAL CHARACTERISTICS
(V
CC
and V
C
= 12 V, (Note 2), R
ref
= 10 kW, C
T
= 820 pF, for typical values T
A
=
25°C, for min/max values T
A
= −25° to +85°C (Note 3), unless otherwise noted.)
Characteristic
OUTPUT SECTION
Output Voltage (Note 4)
Low State (I
Sink
= 100 mA)
Low State
(I
Sink
= 500 mA)
High State (I
Source
= 200 mA)
High State
(I
Source
= 500 mA)
Output Voltage During Initialization Phase
V
CC
= 0 to 1.0 V, I
Sink
= 10
mA
V
CC
= 1.0 to 5.0 V, I
Sink
= 100
mA
V
CC
= 5.0 to 13 V, I
Sink
= 1.0 mA
Output Voltage Rising Edge Slew−Rate (C
L
= 1.0 nF, T
J
= 25°C)
Output Voltage Falling Edge Slew−Rate (C
L
= 1.0 nF, T
J
= 25°C)
ERROR AMPLIFIER SECTION
Voltage Feedback Input (V
E/A out
= 2.5 V)
Input Bias Current (V
FB
= 2.5 V)
Open Loop Voltage Gain (V
E/A out
= 2.0 to 4.0 V)
Unity Gain Bandwidth
T
J
= 25°C
T
J
= −25° to +85°C
Voltage Feedback Input Line Regulation (V
CC
= 10 to 15 V)
Output Current
Sink (V
E/A out
= 1.5 V, V
FB
= 2.7 V)
T
A
= −25° to +85°C
Source (V
E/A out
= 5.0 V, V
FB
= 2.3 V)
T
A
= −25° to +85°C
Output Voltage Swing
High State (I
E/A out (source)
= 0.5 mA, V
FB
= 2.3 V)
Low State (I
E/A out (sink)
= 0.33 mA, V
FB
= 2.7 V)
REFERENCE SECTION
Reference Output Voltage (V
CC
= 10 to 15 V)
Reference Current Range (I
ref
= V
ref
/R
ref
, R = 5.0 k to 25 kW)
Reference Voltage Over I
ref
Range
OSCILLATOR AND SYNCHRONIZATION SECTION
Frequency
T
A
= 0° to +70°C
T
A
= −25° to +85°C
Frequency Change with Voltage (V
CC
= 10 to 15 V)
Frequency Change with Temperature (T
A
= −25° to +85°C)
Df
OSC
/DV
Df
OSC
/DT
f
OSC
44.5
44
−
−
48
−
0.05
0.05
51.5
52
−
−
%/V
%/°C
kHz
V
ref
I
ref
DV
ref
2.4
−500
−40
2.5
−
−
2.6
−100
40
V
mA
mV
V
OH
V
OL
5.5
−
6.5
1.0
7.5
1.1
I
Sink
I
Source
2.0
−2.0
12
−
−
−0.2
V
V
FBline−reg
V
FB
I
FB−ib
A
VOL
BW
−
−
−10
4.0
−
−
−
5.5
10
mV
mA
2.42
−2.0
65
2.5
−0.6
70
2.58
−
−
V
mA
dB
MHz
V
OL
V
OH
V
OL
−
−
−
dVo/dT
dVo/dT
−
−
−
0.1
0.1
300
−300
1.0
1.0
1.0
−
−
V/ms
V/ms
−
−
−
−
1.0
1.4
1.5
2.0
1.2
2.0
2.0
2.7
V
V
Symbol
Min
Typ
Max
Unit
2. Adjust V
CC
above the startup threshold before setting to 12 V.
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
4. V
C
must be greater than 5.0 V.
5. Standby is disabled for V
R P Stby
< 25 mV typical.
6. If not used, Synchronization input must be connected to Ground.
7. Synchronization Pulse Width must be shorter than t
OSC
= 1/f
OSC
.
8. This function can be inhibited by connecting Pin 8 to GND. This allows a continuous current mode operation.
9. This function can be inhibited by connecting Pin 5 to V
CC
.
10. The MC44603A can be shut down by connecting the Soft−Start pin (Pin 11) to Ground.
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3
MC44603A
ELECTRICAL CHARACTERISTICS
(continued) (V
CC
and V
C
= 12 V, (Note 2), R
ref
= 10 kW, C
T
= 820 pF, for typical values T
A
=
25°C, for min/max values T
A
= −25° to +85°C (Note 3), unless otherwise noted.)
Characteristic
OSCILLATOR AND SYNCHRONIZATION SECTION
Oscillator Voltage Swing (Peak−to−Peak)
Ratio Charge Current/Reference Current
T
A
= 0° to +70°C (V
CT
= 2.0 V)
T
A
= −25° to +85°C
Fixed Maximum Duty Cycle = I
discharge
/(I
discharge
+ I
charge
)
Ratio Standby Discharge Current versus I
R F Stby
(Note 5)
T
A
= 0° to +70°C
T
A
= −25° to +85°C (Note 8)
V
R F Stby
(I
R F Stby
= 100
mA)
Frequency in Standby Mode (R
F Stby
(Pin 15) = 25 kW)
Current Range
Synchronization Input Threshold Voltage (Note 6)
Synchronization Input Current
Minimum Synchronization Pulse Width (Note 7)
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold
Output Disable Voltage After Threshold Turn−On (UVLO 1)
T
A
= 0° to +70°C
T
A
= −25° to +85°C
Reference Disable Voltage After Threshold Turn−On (UVLO 2)
DEMAGNETIZATION DETECTION SECTION
(Note 8)
Demagnetization Detect Input
Demagnetization Comparator Threshold (V
Pin 9
Decreasing)
Propagation Delay (Input to Output, Low to High)
Input Bias Current (V
demag
= 65 mV)
Negative Clamp Level (I
demag
= −2.0 mA)
Positive Clamp Level (I
demag
= 2.0 mA)
SOFT−START SECTION
(Note 10)
Ratio Charge Current/I
ref
T
A
= 0° to +70°C
T
A
= −25° to +85°C
Discharge Current (V
soft−start
= 1.0 V)
Clamp Level
I
discharge
V
ss(CL)
I
ss(ch)
/I
ref
0.37
0.36
1.5
2.2
0.4
−
5.0
2.4
0.43
0.44
−
2.6
mA
V
−
V
demag−th
−
I
demag−lb
C
L(neg)
C
L(pos)
50
−
−0.5
−
−
65
0.25
−
−0.38
0.72
80
−
−
−
−
mV
ms
mA
V
V
V
disable2
V
stup−th
V
disable1
8.6
8.3
7.0
9.0
−
7.5
9.4
9.6
8.0
V
13.6
14.5
15.4
V
V
V
R F Stby
F
Stby
I
R F Stby
V
inthH
V
inthL
I
Sync−in
t
Sync
D
I
disch−Stby
/
I
R F Stby
0.46
0.43
2.4
18
−200
3.2
0.45
−5.0
−
0.53
−
2.5
21
−
3.7
0.7
−
−
0.6
0.63
2.6
24
−50
4.3
0.9
0
0.5
V
kHz
mA
V
mA
ms
V
OSC(pp)
I
charge
/I
ref
0.375
0.37
78
0.4
−
80
0.425
0.43
82
%
−
1.65
1.8
1.95
V
−
Symbol
Min
Typ
Max
Unit
2. Adjust V
CC
above the startup threshold before setting to 12 V.
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
4. V
C
must be greater than 5.0 V.
5. Standby is disabled for V
R P Stby
< 25 mV typical.
6. If not used, Synchronization input must be connected to Ground.
7. Synchronization Pulse Width must be shorter than t
OSC
= 1/f
OSC
.
8. This function can be inhibited by connecting Pin 8 to GND. This allows a continuous current mode operation.
9. This function can be inhibited by connecting Pin 5 to V
CC
.
10. The MC44603A can be shut down by connecting the Soft−Start pin (Pin 11) to Ground.
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4
MC44603A
ELECTRICAL CHARACTERISTICS
(continued) (V
CC
and V
C
= 12 V, (Note 2), R
ref
= 10 kW, C
T
= 820 pF, for typical values T
A
=
25°C, for min/max values T
A
= −25° to +85°C (Note 3), unless otherwise noted.)
Characteristic
SOFT−START SECTION
(Note 10)
Duty Cycle (R
soft−start
= 12 kW)
Duty Cycle
(V
soft−start (Pin 11)
= 0.1 V)
OVERVOLTAGE SECTION
Protection Threshold Level on V
OVP
Propagation Delay (V
OVP
> 2.58 V to V
out
Low)
Protection Level on V
CC
T
A
= 0° to +70°C
T
A
= −25° to +85°C
Input Resistance
T
A
= 0° to +70°C
T
A
= −25° to +85°C
FOLDBACK SECTION
(Note 9)
Current Sense Voltage Threshold (V
foldback (Pin 5)
= 0.9 V)
Foldback Input Bias Current (V
foldback (Pin 5)
= 0 V)
STANDBY SECTION
Ratio I
R P Stby
/I
ref
T
A
= 0° to +70°C
T
A
= −25° to +85°C
Ratio Hysteresis (V
h
Required to Return to Normal Operation from
Standby Operation)
T
A
= 0° to +70°C
T
A
= −25° to +85°C
Current Sense Voltage Threshold (V
R P Stby (Pin 12)
= 1.0 V)
CURRENT SENSE SECTION
Maximum Current Sense Input Threshold
(V
feedback (Pin 14)
= 2.3 V and V
foldback (Pin 6)
= 1.2 V)
Input Bias Current
Propagation Delay (Current Sense Input to Output at V
TH
of
MOS transistor = 3.0 V)
TOTAL DEVICE
Power Supply Current
Startup (V
CC
= 13 V with V
CC
Increasing)
Operating T
A
= −25° to +85°C (Note 2)
Power Supply Zener Voltage (I
CC
= 25 mA)
Thermal Shutdown
V
Z
−
I
CC
−
13
18.5
−
0.3
17
−
155
0.45
20
−
−
V
°C
mA
V
CS−th
I
CS−ib
−
0.96
−10
−
1.0
−2.0
120
1.04
−
200
V
mA
ns
V
CS−Stby
V
h
/V
R P Stby
1.42
1.4
0.28
1.5
−
0.31
1.58
1.6
0.34
V
I
R P Stby
/I
ref
0.37
0.36
0.4
−
0.43
0.44
−
−
V
CS−th
I
foldback−lb
0.86
−6.0
0.89
−2.0
0.9
−
V
mA
−
1.5
1.4
2.0
−
3.0
3.4
V
CC prot
16.1
15.9
17
−
17.9
18.1
kW
V
OVP−th
2.42
1.0
2.5
−
2.58
3.0
V
ms
V
D
soft−start 12k
D
soft−start
36
−
42
−
49
0
%
Symbol
Min
Typ
Max
Unit
2. Adjust V
CC
above the startup threshold before setting to 12 V.
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
4. V
C
must be greater than 5.0 V.
5. Standby is disabled for V
R P Stby
< 25 mV typical.
6. If not used, Synchronization input must be connected to Ground.
7. Synchronization Pulse Width must be shorter than t
OSC
= 1/f
OSC
.
8. This function can be inhibited by connecting Pin 8 to GND. This allows a continuous current mode operation.
9. This function can be inhibited by connecting Pin 5 to V
CC
.
10. The MC44603A can be shut down by connecting the Soft−Start pin (Pin 11) to Ground.
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