IP1526 SERIES
TOP VIEW
+ERROR
1
–ERROR
2
COMPENSATION
3
C
SOFTSTART
4
RESET
5
–CURRENT SENSE
6
+CURRENT SENSE
7
SHUTDOWN
8
R
TIMING
9
18
17
16
15
14
13
12
11
10
V
REF
+V
IN
OUTPUT B
GROUND
+V
COLLECTOR
OUTPUT A
SYNC
R
DEADTIME
C
TIMING
REGULATING
PULSE WIDTH
MODULATOR
FEATURES
•
•
•
•
•
•
8 to 35V operation
5V reference trimmed to ±1%
1Hz to 400kHz oscillator range
Dual 100mA source/sink outputs
Digital current limiting
Double pulse suppression
J Package – 18 Pin Ceramic DIP
N Package – 18 Pin Plastic DIP
DW Package – 18 Pin Plastic (300) SOIC
Order Information
Part
J–Pack
N–Pack
D–18
Temp.
Number
18 Pin
18 Pin
18 Pin
Range
IP1526
-55 to +125°C
IP3526
0 to +70°C
Note:
To order, add the package identifier to the part number.
eg.
IP1526J
IP3526DW–18
• Programmable deadtime
• Undervoltage lockout
• Single Pulse metering
• Programmable soft start
• Wide current limit common mode range
• TTL/CMOS compatible logic ports
• Symmetry correction capability
• Guaranteed 6 unit synchronisation
ABSOLUTE MAXIMUM RATINGS
(T
case
= 25°C unless otherwise stated)
+V
IN
Input Voltage
Collector Supply Voltage
Logic Inputs
Analogue Inputs
Source / Sink Load Current
Reference Load Current
Logic Sink Current
P
D
P
D
T
J
T
STG
T
L
Power Dissipation
Power Dissipation
T
A
= 25°C
Derate @ T
A
> 50°C
T
C
= 25°C
Derate @ T
C
> 25°C
+40V
+40V
–0.3 to +5.5V
–0.3 to +V
IN
200mA
Internally Limited
15mA
1W
10mW/°C
3W
24mW/°C
See Ordering Information
–65 to +150°C
(soldering, 10 seconds)
Fax +44(0)1455 552612.
Website:
http://www.semelab.co.uk
Operating Junction Temperature
Storage Temperature Range
Lead Temperature
Telephone +44(0)1455 556565.
E-mail:
sales@semelab.co.uk
+300°C
4/99
Semelab plc.
IP1526 SERIES
DESCRIPTION
The IP1526 and IP3526 high performance monolithic pulse width modulator circuits are designed for fixed-frequency switching
regulators and other power control applications. Included in an 1 8-pin dual-in-line package are a temperature compensated voltage
reference, sawtooth oscillator, error amplifier, pulse width modulator, pulse metering and steering logic, and two low impedance power
drivers. Also included are protective features such as soft-start and under-voltage lockout, digital current limiting, double pulse inhibit, a
data latch for single pulse metering, adjustable deadtime, and provision for symmetry correction inputs. For ease of interface, all digital
control ports are TTL and B-series CMOS compatible. Active LOW logic design allows wired-OR connections for maximum flexibility.
This versatile device can be used to implement single-ended or push-pull switching regulators of either polarity, both transformerless
and transformer coupled.
BLOCK DIAGRAM
+ERROR
1
–ERROR
2
COMPENSATION
3
C
SOFTSTART
4
RESET
5
–CURRENT SENSE
6
+CURRENT SENSE
7
SHUTDOWN
8
R
TIMING
9
18
17
16
15
14
13
12
11
10
V
REF
+V
IN
OUTPUT B
GROUND
+V
COLLECTOR
OUTPUT A
SYNC
R
DEADTIME
C
TIMING
RECOMMENDED OPERATING CONDITIONS
V
IN
Input Voltage
Collector Voltage
Sink/Source Load Current (Each Output)
Reference Load Current
Oscillator Frequency Range
R
T
C
T
Oscillator Timing Resistor
Oscillator Timing Capacitor
Available Deadtime Range @ 40kHz
Operating Ambient Temperature Range
IP1526
IP3526
+8 to +35V
+4.5 to +35V
0 to 100mA
0 to 20mA
1Hz to 400kHz
2kΩ to 150kΩ
470pF to 20µF
3% to 50%
–55 to +125°C
0 to +70°C
Semelab plc.
Telephone +44(0)1455 556565.
E-mail:
sales@semelab.co.uk
Fax +44(0)1455 552612.
Website:
http://www.semelab.co.uk
4/99
IP1526 SERIES
ELECTRICAL CHARACTERISTICS
(T
J
= Over Operating Temperature Range unless otherwise stated)
Parameter
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Output Voltage Range
Short Circuit Current
V
REF
= 0
4.9
25
Test Conditions
IP1526
Min.
Typ. Max.
4.95
5.0
2
5
15
5.0
80
5.05
20
30
50
5.1
140
IP3526
Min.
Typ. Max.
4.9
5.0
2
5
15
4.85
25
5.0
80
5.1
30
50
50
5.15
140
Units
V
mV
mV
V
mA
REFERENCE SECTION
T
J
= 25°C
V
IN
= 8 to 35V
I
L
= 0 to 20mA
UNDERVOLTAGE LOCKOUT
RESET Output Voltage
V
REF
= 3.8V
V
REF
= 4.8V
2.4
0.2
4.8
0.4
2.4
0.2
4.8
0.4
V
OSCILLATOR SECTION
2
Initial Accuracy
Voltage Stability
Temperature Stability
Minimum Frequency
Maximum Frequency
Sawtooth Peak Voltage
Sawtooth Valley Voltage
R
T
= 150kΩ
R
T
= 2kΩ
V
IN
= 35V
V
IN
= 8V
R
S
≤
2kΩ
T
J
= 25°C
0.5
C
T
= 0.2µF
C
T
= 470pF
400
3
1
3.5
T
J
= 25°C
V
IN
= 8 to 35V
±3
0.5
3
±8
1
10
100
400
3
1
3.5
±3
0.5
7
±8
1
10
100
Hz
kHz
V
%
ERROR AMPLIFIER SECTION
3
Input Offset Voltage
Input Bias Current
Input Offset Current
DC Open Loop Gain
High Output Voltage
R
L
≥
10MΩ
V
PIN1
– V
PIN2
≥
150mV
I
SOURCE
= 100µA
V
PIN1
– V
PIN2
≥
150mV
I
SINK
= 100µA
R
S
≤
2kΩ
V
IN
= 12V to 18V
70
66
64
3.6
2
–350
35
72
4.2
5
–1000
100
60
3.6
2
–350
35
72
4.2
10
–2000
200
mV
nA
dB
V
Low Output Voltage
Common Mode Rejection
Supply Voltage Rejection
0.2
94
80
0.4
70
66
0.2
94
80
0.4
V
dB
NOTES
1. Test Conditions unless otherwise stated:
V
IN
= 15V
for IP1526
T
J
= –55 to +125°C
for IP3526
T
J
= 0 to +70°C
2. Oscillator / PWM Section Test Conditions:
f
OSC
= 40kHz
(R
T
= 4.12kΩ , C
T
= 0.01µF ±1%, R
D
= 0)
3. Error Amplifier Section Test Condition:
V
CM
= 0 to 5.2V
Semelab plc.
Telephone +44(0)1455 556565.
E-mail:
sales@semelab.co.uk
Fax +44(0)1455 552612.
Website:
http://www.semelab.co.uk
4/99
IP1526 SERIES
ELECTRICAL CHARACTERISTICS
(T
J
= Over Operating Temperature Range unless otherwise stated)
Parameter
Minimum Duty Cycle
Maximum Duty Cycle
Test Conditions
IP1526
Min.
Typ. Max.
0
45
49
IP3526
Min.
Typ. Max.
0
45
49
Units
PWM COMPARATOR
2
V
PIN2
– V
PIN1
≥
150mV
V
PIN1
– V
PIN2
≥
150mV
I
SOURCE
= 40µA
I
SINK
= 3.6mA
V
IH
= 2.4V
V
IL
= 0.4V
%
DIGITAL PORTS (SYNC, SHUTDOWN & RESET)
HIGH Output Voltage
LOW Output Voltage
HIGH Input Current
LOW Input Current
2.4
4.0
0.2
–125
–225
0.4
–200
–360
2.4
4.0
0.2
–125
–225
0.4
–300
–500
V
µA
CURRENT LIMIT COMPARATOR
4
Sense Voltage
Input Bias Current
R
S
≤
50Ω
90
100
–3
110
–10
80
100
–3
120
–10
mV
µA
V
µA
SOFT–START SECTION
Error Clamp Voltage
C
S
Charging Current
RESET = 0.4V
RESET = 2.4V
50
0.1
100
0.4
150
50
0.1
100
0.4
150
OUTPUT DRIVERS (each output)
5
HIGH Output Voltage
I
SOURCE
= 20mA
I
SOURCE
= 100mA
I
SINK
= 20mA
I
SINK
= 100mA
V
C
= 40V
C
L
= 1000pF
C
L
= 1000pF
12.5
12
13.5
13
0.2
1.2
50
0.3
0.1
0.3
2.0
150
0.6
0.2
12.5
12
13.5
13
0.2
1.2
50
0.3
0.1
0.3
2.0
150
0.6
0.2
V
LOW Output Voltage
Collector Leakage
Rise Time
Fall Time
V
µA
µs
POWER CONSUMPTION
Standby Current
V
IN
= 35V
R
T
= 4.12kΩ
SHUTDOWN = 0.4V
18
30
18
30
mA
NOTES
1. Test Conditions unless otherwise stated:
V
IN
= 15V
for IP1526
T
J
= –55 to +125°C
for IP3526
T
J
= 0 to +70°C
2. Oscillator / PWM Section Test Conditions:
f
OSC
= 40kHz
(R
T
= 4.12kΩ , C
T
= 0.01µF ±1%, R
D
= 0)
3. Error Amplifier Section Test Conditions:
V
CM
= 0 to 5.2V
4. Current Limit Comparator Section Test Conditions:
V
CM
= 0 to 12V
5. Output Driver Section Test Conditions:
V
C
= 15V
Semelab plc.
Telephone +44(0)1455 556565.
E-mail:
sales@semelab.co.uk
Fax +44(0)1455 552612.
Website:
http://www.semelab.co.uk
4/99
IP1526 SERIES
APPLICATIONS INFORMATION
Push–Pull Configuration
Single–Ended Configuration
+V
SUPPLY
+V
SUPPLY
R1
14
R1
C1
T1
A
13
14
C1
T1
A
13
+V
C
Q1
R2
C2
+V
C
Q1
R2
C2
IP1526
B
GND
15
16
IP1526
Q2
B
GND
15
16
Q2
R3
R3
RETURN
RETURN
Driving N–Channel Power MOSFETs
+15V
75Ω
14
+V
C
A
Q1
13
T1
IP1526
Q2
B
GND
15
16
RETURN
Semelab plc.
Telephone +44(0)1455 556565.
E-mail:
sales@semelab.co.uk
Fax +44(0)1455 552612.
Website:
http://www.semelab.co.uk
4/99
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