LAB
TOP VIEW
V
CC
V
Z
FEEDBACK
GAIN
1
8
SEME
IP5661C
IP5561C
GND
OUTPUT
CURRENT
SENSE
R
T
/C
T
2
7
SWITCHED–MODE
POWER SUPPLY
CONTROL CIRCUIT
FEATURES
• STABILISED POWER SUPPLY
• TEMPERATURE COMPENSATED REFERENCE
SOURCE
• SAWTOOTH GENERATOR
• PULSE WIDTH MODULATOR
• CURRENT LIMITING
• 8 PIN DIP
V
CC
3
6
4
5
J Package – 8 Pin Ceramic DIP
N Package – 8 Pin Plastic DIP
D Package – 8 Pin Plastic (150) SOIC
BLOCK DIAGRAM
R
T
C
T
5
REFERENCE
VOLTAGE
ERROR
AMP
FEEDBACK
GAIN
3
SAWTOOTH
GENERATOR
DESCRIPTION
7
S
4
OUTPUT
PWM
LATCH
R
0.5V
CURRENT
SENSE
6
STABILISED
SUPPLY
2
8.2V
V
z
1
8
V
CC
GND
The IP5561 is a control circuit for use in switched
mode power supplies. This single monolithic chip
incorporates all the control and supervisory (protection)
functions required in switched mode power supplies,
including an inter nal temperature compensated
reference source, internal zener reference, sawtooth
generator, pulse width modulator, output stage and
cycle by cycle current limit.
Order Information
Part
Number
IP5561
IP5561C
J–Pack
8 Pin
N–Pack
8 Pin
D–8
8 Pin
Temp.
Range
-55 to +125°C
0 to +70°C
Note:
To order, add the package identifier to the part number.
eg.
IP5561J
IP5561CD–8
ABSOLUTE MAXIMUM RATINGS
(T
case
= 25°C unless otherwise stated)
SUPPLY
Voltage Sourced
Current Sourced
18V
30mA
OUTPUT TRANSISTOR
Output Current
Collector Voltage
(Pin 7)
Operating Junction Temperature
Storage Temperature Range
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
T
J
T
STG
40mA
18V
See Ordering Information
–55 to +150°C
Prelim. 4/95
Semelab plc.
LAB
ELECTRICAL CHARACTERISTICS
(T
J
= 25°C unless otherwise stated)
Parameter
Test Conditions
IP5561
Min.
Typ. Max.
3.69
T
J
= Over Temp. Range
I
L
= -7mA
3.65
±100
7.8
8.2
±200
8.8
7.8
3.75
3.84
3.88
SEME
IP5661C
IP5561C
IP5561C
Min.
Typ. Max.
3.57
3.55
±100
8.2
±200
8.8
3.75
3.96
3.98
Units
REFERENCE SECTIONS
Internal Reference Voltage (V
REF
)
Temperature Coefficient of V
REF
Internal Reference (V
Z
)
Temperature Coefficient of V
Z
V
ppm/°C
V
ppm/°C
OSCILLATOR SECTION
Frequency Range
Initial Accuracy Oscillator
Duty Cycle Range
T
J
= Over Temp. Range
f
O
= 20kHz
50
12
0–90
0–98
0–90
100k
50
12
0–98
100k
Hz
%
CURRENT LIMITING
I
IN
V
pin6
= 250mV
T
J
= Over Temp. Range
Inhibit Delay Time
Single Pulse Inhibit Delay
Current Limit Trip Level
for 20% overdrive
I
OUT
= 20mA
I
OUT
= 40mA
0.40
0.88
0.7
0.50
–2
–10
-20
1.10
0.8
0.60
0.40
0.88
0.7
0.50
–2
–10
-20
1.10
0.8
0.60
µA
µs
V
ERROR AMPLIFIER
Output Voltage Swing (V
OH
)
Output Voltage Swing (V
OL
)
Open Loop Gain
Feedback Resistor
Small Signal Bandwidth
10k
3
60
10k
3
6.2
0.7
60
6.2
0.7
V
dB
Ω
MHz
OUTPUT STAGE
V
CE(sat)
Output Current
I
C
= 20mA
T
J
= Over Temp. Range
20
0.4
20
0.4
V
mA
T
J
= Over Temp. Range
SUPPLY VOLTAGE/CURRENT
Supply Current (I
CC
)
Supply Voltage (V
CC
)
I
Z
= 0, Voltage Fed
T
J
= Over Temp. Range
I
CC
= 10mA, Voltage Fed
I
CC
= 30mA, Voltage Fed
20
20
21
10
13
22
30
19
20
21
10
13
24
30
mA
V
LOW SUPPLY PROTECTION
Pin 1 Threshold
8
9
10.5
8
9
10.5
V
NOTES
1) Test Conditions: V
CC
= 12V , T
J
= 25°C unless otherwise stated
2) Tests marked T
J
= Over Temp. Range apply over the full temperature range
ie.
T
J
= -55 to +125°C for IP5561
T
J
= 0 to +70°C for IP5561C
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 4/95
LAB
Open Loop Phase
0
60
SEME
IP5661C
IP5561C
TYPICAL PERFORMANCE CHARACTERISTICS — ERROR AMPLIFIER
Open Loop Gain
-30
50
PHASE ANGLE (˚)
-60
GAIN (dB)
40
-90
30
-120
20
-150
10
-180
0
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1k
10k
100k
FREQUENCY (Hz)
1M
10M
Transfer Curve of Pulse Width Modulator
Duty Cycle vs Input Voltage
100
δ
MAX
– MAXIMUM DUTY CYCLE (%)
90
80
δ
– DUTY CYCLE (%)
70
60
50
40
30
20
10
0
0
1
2
V
3
Pin 4
Maximum Duty Cycle vs
Base Voltage on Q1
100
90
80
70
60
50
40
30
20
10
0
4
5
6
0
1
2
V
Pin 1
3
4
5
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 4/95
LAB
Power Derating Curve
1.00
V
PIN4
SEME
IP5661C
IP5561C
TYPICAL PERFORMANCE CHARACTERISTICS — ERROR AMPLIFIER
Slow Start Voltage
0.75
P
D
MAX (W)
0.50
0.25
0.00
25
50
75
100
125
150
t = R'C
t
T
A
AMBIENT TEMPERATURE (˚C)
P
D
= V
CC
I
CC
+ ( V
CC
– V
Z
) I
Z
+ ( V
pin7
I
pin7
x
δ
)
Typical Frequency Plot vs R
T
and C
T
200
Start-up Circuit (Optional)
V
Z
2
OSCILLATOR FREQUENCY (kHz)
100
50
R=5
k
Ω
R=1
0k
Ω
R=2
0k
Ω
R=4
0k
Ω
R
T
5
2
IP5561
R
1
4
V
1
C
Q
1
IP5561
R
2
10
5
C
T
δ
max
= f
(
R
2
R
1
+R
2
V
Z
+ V
BE Q1
)
1
1.5
2
2.5
3
3.5
4
4.5
(nF)
5
TIMING CAPACITANCE
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 4/95
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