LAB
TOP VIEW
INV. INPUT
1
N. I. INPUT
2
SYNC
3
OSC. OUTPUT
4
C
T
5
R
T
6
DISCHARGE
7
SOFT START
8
16
15
14
13
12
11
10
9
SEME
IP1525A SERIES
IP1527A SERIES
V
REF
V
IN
OUTPUT B
V
C
GROUND
OUTPUT A
SHUTDOWN
COMPENSATION
REGULATING
PULSE WIDTH
MODULATORS
FEATURES
•
•
•
•
•
•
8 to 35V operation
5.1V reference trimmed to ±1%
100Hz to 500kHz oscillator range
Separate oscillator sync terminal
Adjustable deadtime control
Internal soft start
J Package – 16 Pin Ceramic DIP
N Package – 16 Pin Plastic DIP
D Package – 16 Pin Plastic (300) SOIC
• Input undervoltage lockout
• Latching PWM to prevent multiple pulses
• Dual source/sink output drivers
Order Information
Part
Number
IP1525A
IP1527A
IP3525A
IP3527A
J–Pack
16 Pin
N–Pack
16 Pin
D–16
16 Pin
Temp.
Range
-55 to +125°C
-55 to +125°C
0 to +70°C
0 to +70°C
Note:
To order, add the package identifier to the part number.
eg.
IP1525AJ
IP3527AD–16
ABSOLUTE MAXIMUM RATINGS
(T
case
= 25°C unless otherwise stated)
+V
IN
Input Voltage
Collector Voltage
Logic Inputs
Analogue Inputs
Output Current, Source or Sink
Reference Output Load Current
Oscillator Charging 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
500mA
Internally Limited
5mA
1W
10mW/°C
2W
16mW/°C
See Ordering Information
–65 to +150°C
(soldering, 10 seconds)
+300°C
Prelim. 3/95
Operating Junction Temperature
Storage Temperature Range
Lead Temperature
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
LAB
DESCRIPTION
BLOCK DIAGRAM
V
REF
16
SEME
IP1525A SERIES
IP1527A SERIES
The IP1525A and IP1527A families of PWM switching regulator control circuits offer improved performance and lower
parts count when used in designing switching power supplies. Included are 5.1 volt reference, error amplifier, adjustable
dead-time oscillator with synchronisation capability, latched PWM comparator, totem-pole output drivers, shutdown, soft
start, and undervoltage lockout.
The IP1525A and IP1527A differ only in output phasing. The IP1525A output is low when “off”, while the IP1527A
output is high when “off”.
V
C
13
+V
IN
15
REFERENCE
REGULATOR
GND
12
U.V.
LOCKOUT
11
TO INTERNAL
CIRCUITRY
3
OUTPUT A
SYNC
R
T
C
T
DISCHARGE
6
OSC. OUTPUT
4
FLIP
FLOP
Q
14
5
7
OSCILLATOR
Q
OUTPUT B
IP1525A OUTPUT STAGE
9
COMPENSATION
INV.
INPUT
N.I.
INPUT
SOFT START
SHUTDOWN
R
S
+V
IN
V
C
13
1
2
PWM
LATCH
11
OUTPUT A
ERROR
AMP
8
50µA
V
REF
10
5kΩ
14
OUTPUT B
5kΩ
IP1527A OUTPUT STAGE
RECOMMENDED OPERATING CONDITIONS
V
IN
Input Voltage
Collector Voltage
Sink/Source Load Current (Steady State)
Sink/Source Load Current (Peak)
Reference Load Current
Oscillator Frequency Range
R
T
C
T
Oscillator Timing Resistor
Oscillator Timing Capacitor
Deadtime Resistor Range
Operating Ambient Temperature Range
IP1525A / IP1527A
IP3525A / IP3527A
+8 to +35V
+4.5 to +35V
0 to 100mA
0 to 400mA
0 to 20mA
100Hz to 400kHz
2kΩ to 200kΩ
470pF to 0.1µF
0 to 500Ω
–55 to +125°C
0 to +70°C
Prelim. 3/95
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
LAB
Parameter
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Output Variation
Short Circuit Current
Output Noise Voltage
Long Term Stability
Over Line, Load and Temp.
V
REF
= 0
f = 10 Hz to 10kHz
5.0
80
40
1
SEME
IP1525A SERIES
IP1527A SERIES
ELECTRICAL CHARACTERISTICS
(T
J
= Over Operating Temperature Range unless otherwise stated)
Test Conditions
IP1525A
IP1527A
Min.
Typ. Max.
5.05
5.10
2
5
20
5.15
10
50
50
5.2
100
200
10
4.95
80
40
1
IP3525A
IP3527A
Min.
Typ. Max.
5.0
5.1
2
5
20
5.2
20
50
50
5.25
100
200
50
Units
V
mV
mV
V
mA
µVrms
mV
kHr
REFERENCE SECTION
T
J
= 25°C
V
IN
= 8 to 35V
I
L
= 0 to 20mA
OSCILLATOR SECTION
2
Initial Accuracy
Voltage Stability
Temperature Stability
Minimum Frequency
Maximum Frequency
Current Mirror
Clock Amplitude
Clock Width
Sync Threshold
Sync Input Current
Sync Voltage = 3.5V
T
J
= 25°C
R
T
= 200kΩ
R
T
= 2kΩ
I
RT
= 2mA
C
T
= 0.1µF
C
T
= 470pF
400
1.7
3.0
0.3
1.2
V
IN
= 8 to 35V
2
0.3
3
90
600
2.0
3.5
0.5
2.0
1.0
1.0
2.8
2.5
2.2
6
1
6
120
400
1.7
3.0
0.3
1.2
2
1
3
90
600
2.0
3.5
0.5
2.0
1.0
1.0
2.8
2.5
2.2
6
2
6
120
Hz
kHz
mA
V
µs
V
mA
%
ERROR AMPLIFIER SECTION
3
Input Offset Voltage
Input Bias Current
Input Offset Current
DC Open Loop Gain
Gain Bandwidth Product
R
L
≥
10MΩ
T
J
= 25°C
60
1
75
2
0.5
1
5
10
1
60
1
75
2
2
1
10
10
1
mV
µA
dB
MHz
NOTES
1. Test Conditions unless otherwise stated:
V
IN
= 20V
T
J
= –55 to +125°C for IP1525A / IP1527A
for IP3525A / IP3527A
T
J
= 0 to +70°C
2. Oscillator Section Test Conditions:
(R
T
= 3.6kΩ , C
T
= 0.01µF , R
D
= 0)
f
OSC
= 40kHz
3. Error Amplifier Section Test Condition:
V
CM
= 5.1V
4. Output Driver Section Test Condition:
V
C
= 20V
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
LAB
Parameter
Output Low Level
Output High Level
Common Mode Rejection
Supply Voltage Rejection
V
CM
= 1.5 to 5.2V
V
IN
= 8 to 35V
3.8
60
50
SEME
IP1525A SERIES
IP1527A SERIES
ELECTRICAL CHARACTERISTICS
(T
J
= Over Operating Temperature Range unless otherwise stated)
Test Conditions
IP1525A
IP1527A
Min.
Typ. Max.
0.2
5.6
75
60
0.5
3.8
60
50
IP3525A
IP3527A
Min.
Typ. Max.
0.2
5.6
75
60
0.5
Units
ERROR AMPLIFIER SECTION (cont.)
3
V
dB
PWM COMPARATOR
Minimum Duty Cycle
Maximum Duty Cycle
Input Threshold
Input Threshold
Input Bias Current
V
PIN1
– V
PIN2
≥
150mV
V
PIN2
– V
PIN1
≥
150mV
Zero Duty Cycle
Max. Duty Cycle
45
0.6
49
0.9
3.3
0.05
3.6
1.0
0
45
0.6
49
0.9
3.3
0.05
3.6
1.0
0
%
V
µA
µA
V
mA
µs
SHUTDOWN SECTION
Soft Start Current
Soft Start Low Level
Shutdown Threshold
Shutdown Input Current
Shutdown Delay
V
SHUTDOWN
= 0V
V
SHUTDOWN
= 2V
To Outputs
V
SHUTDOWN
= 2.5V
V
SHUTDOWN
= 2.5V
I
SINK
= 20mA
I
SINK
= 100mA
I
SOURCE
= 20mA
I
SOURCE
= 100mA
V
COMP
= High
V
C
= 35V
C
L
= 1nF
C
L
= 1nF
V
IN
= 35V
T
J
= 25°C
T
J
= 25°C
100
50
18
17
5
T
J
= 25°C
0.6
25
50
0.4
1.3
0.1
0.2
80
0.6
2.0
1.0
0.5
0.6
25
50
0.4
1.3
0.1
0.2
80
0.6
2.0
1.0
0.5
OUTPUT DRIVERS (each output)
4
Output Low Level
0.2
1.0
19
18
7
8
200
600
300
100
50
0.4
2.0
18
17
5
0.2
1.0
19
18
7
8
200
600
300
0.4
2.0
V
Output High Level
Undervoltage Lockout
Output Leakage
Rise Time
Fall Time
V
V
µA
ns
TOTAL STANDBY CURRENT
Supply Current
10
20
10
20
mA
NOTES
1. Test Conditions unless otherwise stated:
V
IN
= 20V
T
J
= –55 to +125°C for IP1525A / IP1527A
for IP3525A / IP3527A
T
J
= 0 to +70°C
2. Oscillator Section Test Conditions:
(R
T
= 3.6kΩ , C
T
= 0.01µF , R
D
= 0)
f
OSC
= 40kHz
3. Error Amplifier Section Test Condition:
V
CM
= 5.1V
4. Output Driver Section Test Condition:
V
C
= 20V
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
LAB
APPLICATIONS INFORMATION
+ V
S U P PL Y
R1
Q1
TO OU TPU T FIL TER
SEME
IP1525A SERIES
IP1527A SERIES
+ V
S U P P L Y
R2
13
R1
13
C1
+ V
C
A
11
+ V
C
A
11
T1
Q1
R2
C2
IP1525A
B
GND
12
14
IP1525A
B
GND
12
14
Q2
R3
R E TU R N
R E TU R N
For single–ended supplies, the driver outputs are grounded.
The V
C
terminal is switched to ground by the totem–pole
source transistors on alternate oscillator cycle.
In conventional push–pull bipolar designs, forward base drive
is controlled by R1–R3. Rapid turn–off times for the power
devices are achieved with speed–up capacitors C1 and C2.
+ V
S U P P L Y
R1
+ V
S U P PL Y
Q1
T1
13
13
C1
R1
+ V
C
A
Q1
11
T1
+ V
C
A
11
T2
Q2
IP1 5 2 5 A
Q2
B
GND
12
14
IP1525A
B
GND
12
14
C2
R2
RE TU RN
RE TU RN
The low source impedance of the output drivers provides
rapid charging of power FET input capacitance while minimis-
ing external components.
Low power transformers can be driven directly by the
IP1525A. Automatic reset occurs during deadtime when both
ends of the primary winding are switched to ground.
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
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