Datasheet IP3524J, IP3524D, IP2524D, IP2524N, IP2524J Datasheet (Semelab Plc)

LAB

SEME

IP1524 SERIES

Semelab plc. Telephone [phone]. Telex: 341927. Fax [phone].

Prelim. 3/95

REGULATING

PULSE WIDTH

MODULATORS

FEATURES

• Guaranteed ±2% reference voltage tolerance

• Guaranteed ±6% oscillator tolerance

• Fully specified temperature performance

• Guaranteed 10mV/1000 hours long term stability

• Interchangeable with SG1524 series

+V

IN

Input Voltage
Collector Voltage
Output Current (each transistor)
Reference Load Current
Oscillator Charging Current
Shut Down Pin Voltage
Current Limit Sense Common Mode Range

P

D

Power Dissipation TA= 25°C

Derate @ TA> 50°C

P

D

Power Dissipation TC= 25°C

Derate @ TC> 25°C

T

J

Operating Junction Temperature

T

STG

Storage Temperature Range

T

L

Lead Temperature (soldering, 10 seconds)

+40V
+40V

100mA

Internally Limited

5mA

+5.5V

–1.0 to +1.0V

1W

10mW/°C

2W

16mW/°C

See Ordering Information

–65 to +150°C

+300°C

ABSOLUTE MAXIMUM RATINGS (T

case

= 25°C unless otherwise stated)

TOP VIEW

J Package – 16 Pin Ceramic DIP
N Package – 16 Pin Plastic DIP
D Package – 16 Pin Plastic (150) SOIC

8

1

2

3

4

5

6

7

14

13

12

11

10

9

15

16

INV. IN P UT

N. I. INPUT

OSC. OUTPUT

+C.L. SENSE

–C.L. SE NSE

R

T

C

T

GROUND

V

REF

V

IN

E

B

C

B

C

A

E

A

SHUTDOWN

COMPENSATION

Part J–Pack N–Pack D–16 Temp.
Number 16 Pin 16 Pin 16 Pin Range

IP1524 ✔ -55 to +125°C
IP2524 ✔✔✔-25 to +85°C
IP3524 ✔✔✔0 to +70°C

Order Information

Note:

To order, add the package identifier to the part number.
eg. IP1524J

IP3524D–16

LAB

SEME

IP1524 SERIES

Semelab plc. Telephone [phone]. Telex: 341927. Fax [phone].

Prelim. 3/95

V

R

C

+5V TO ALL
INTERNAL CIRCUITRY

INV.

INPUT

ERROR
AMP

REFERENCE
REGULATOR

OSCILLATOR

OSCILLATOR
OUTPUT

FLIP

FLOP

COMPARATOR

+5V

NOR

NOR

SHUTDOWN

C

E

C

E

+5V

C.L.

N.I.

INPUT

GND

(SUBSTRATE)

COMPENSATION

+SENSE
–SENSE

+5V

4

9

5

1

2

8

10

IN

T

T

15

6

7

A

A

B

B

12

11

13

14

16

3

1k

Ω

10k

Ω

+8 to +40V

0 to +40V

+1.8 to +3.4V

0 to 100mA

0 to 20mA
30µA to 2mA
50Hz to 500kHz

1.8kΩ to 100kΩ
1nF to 0.1µF
–55 to +125°C

-25 to +85°C
0 to +70°C

RECOMMENDED OPERATING CONDITIONS

DESCRIPTION

The IP1524 series of PWM switching regulator control circuits contains all the functions required to implement single­ended or push-pull switching regulators. Included are voltage reference, error amplifer, oscillator, PWM comparator,
output drivers, current limiting and shutdown circuitry.

Although functionally indentical to the SG1524 series, SEMELAB has incorporated several improvements to the IP1524
allowing tighter and more complete specification of electrical performance.

BLOCK DIAGRAM

V

IN

Input Voltage
Collector Voltage
Error Amp Common Mode Range
Output Current (each transistor)
Reference Load Current
Oscillator Charging Current
Oscillator Frequency Range

R

T

Oscillator Timing Resistor

C

T

Oscillator Timing Capacitor

T

AMB

Operating Ambient Temperature Range IP1524

IP2524
IP3524

NOTES

1. Test Conditions unless otherwise stated: VIN= 20V , I

REF

= 0.

2. V

CM

= +1.8 to +3.4V

3. V

CM

= -1 to +1V

LAB

SEME

IP1524 SERIES

Semelab plc. Telephone [phone]. Telex: 341927. Fax [phone].

Prelim. 3/95

4.60 5.00 5.40
10 30
20 50
66

100

0.3 1
20

5

0.5 1

2

120

300

3.6

1

3.5

0.5

210
110

1

60 80

0.5

3.8
70
70

3

4.90 5.00 5.10
110
520

80

25 50 120

0.3 1
110

6

0.1 1
12

120 240

200 300

3.6

0.6 1

3.0 4.0

0.3 0.5 1.0

0.1 5
12

0.5

72 80

0.5

3.8
70 90
70 100

3

IP1524
IP2524 IP3524

Parameter Test Conditions

1

Min. Typ. Max. Min. Typ. Max. Units

Output Voltage
Line Regulation
Load Regulation
Ripple Rejection
Short Circuit Current
Temperature Stability

Long Term Stability

Initial Accuracy
Voltage Stability
Temperature Stability

Minimum Frequency

Maximum Frequency

Sawtooth Peak Voltage
Sawtooth Valley Voltage

Clock Amplitude

Clock Pulse Width

Input Offset Voltage
Input Bias Current
Input Offset Current
DC Open Loop Gain
Output Low Level
Output High Level
Common Mode Rejection
Supply Voltage Rejection
Gain Bandwidth Product

T

J

= Over Temp. Range

+V

IN

= 8 to 40V TJ= Over Temp. Range

I

L

= 0 to 20mA TJ= Over Temp. Range
f = 120Hz
V

REF

= 0 TJ= Over Temp. Range

T

J

= Over Temp. Range

T

J

= 125°C

R

T

= 2.7kΩ CT= 0.01µF

+V

IN

= 8 to 40V

T

J

= Over Temp. Range

R

T

= 100kΩ CT= 0.1µF

T

J

= Over Temp. Range

R

T

= 2kΩ CT= 0.001µF

T

J

= Over Temp. Range

C

T

= 0.01µF

C

T

= 0.01µF

Output, Pin 3 C

T

= 0.01µF

T

J

= Over Temp. Range

Output, Pin 3 C

T

= 0.01µF

T

J

= Over Temp. Range

T

J

= Over Temp. Range

T

J

= Over Temp. Range

T

J

= Over Temp. Range

V

PIN1

– V

PIN2

≥ 150mV

V

PIN2

– V

PIN2

≥ 150mV

+V

IN

= 8 to 40V

V

mV

dB

mA

%

mV

khr

%

Hz

kHz

V

V

µs

mV

µA
dB

V

dB

MHz

ELECTRICAL CHARACTERISTICS (T

J

= 25°C unless otherwise stated)

ERROR AMP SECTION

2

REFERENCE SECTION

OSCILLATOR SECTION

NOTES

1. Test Conditions unless otherwise stated: VIN= 20V , I

REF

= 0.

2. V

CM

= +1.8 to +3.4V

3. V

CM

= -1 to +1V

IP1524
IP2524 IP3524

Parameter Test Conditions

1

Min. Typ. Max. Min. Typ. Max. Units

0

45 49

180 200 220

200

1.2
4

0.3

40

0.1 50
12

17 18

0.2

0.1

510

0

45 49

190 200 210
170 200 230

1.2
48

0.3

40

0.1 50
12

17 18

0.2 0.4

0.1 0.2

510

Minimum Duty Cycle

Maximum Duty Cycle

Sense Voltage

High Input Voltage

High Input Current

Low Input Voltage

Collector – Emitter Voltage
Collector Leakage Current
Collector Saturation
Voltage
Emitter Output Voltage
Emitter Voltage Rise Time
Collector Voltage Fall Time

Standby Current

V

PIN1

– V

PIN2

≥ 150mV

T

J

= Over Temp. Range

V

PIN2

– V

PIN1

≥ 150mV

T

J

= Over Temp. Range

V

CM

= 0

V

CM

= 0 TJ= Over Temp. Range

V

PIN9

≤ 0.6V TJ= Over Temp. Range

V

SHUTDOWN

= +5V

T

J

= Over Temp. Range

V

PIN9

≥ 3.5V TJ= Over Temp. Range

I

C

= 50µAT

J

= Over Temp. Range

V

CE

= 40V TJ= Over Temp. Range

I

C

= 50mA TJ= Over Temp. Range

V

IN

= 20V TJ= Over Temp. Range

R

E

= 2kΩ

R

C

= 2kΩ

V

IN

= 40V TJ= Over Temp. Range

%

%

mV

V

mA

V

V

µA

V
V

µs

mA

LAB

SEME

IP1524 SERIES

Semelab plc. Telephone [phone]. Telex: 341927. Fax [phone].

Prelim. 3/95

ELECTRICAL CHARACTERISTICS (T

J

= 25°C unless otherwise stated)

PWM COMPARATOR

POWER CONSUMPTION

CURRENT LIMIT AMPLIFIER

3

SHUTDOWN INPUT

OUTPUT SECTION (each transistor)

LAB

SEME

IP1524 SERIES

Semelab plc. Telephone [phone]. Telex: 341927. Fax [phone].

Prelim. 3/95

APPLICATIONS INFORMATION

The IP1524 is a fixed-frequency pulse-width
modulation voltage regulator control circuit. The
regulator operates at a frequency that is programmed
by one timing resistor (RT) and one timing capacitor
(CT). RTestablishes a constant charging current for CT,
which is fed to the comparator providing linear control of
the output pulse width by the error amplifier.

The IP1524 contains an on-board 5V regulator that
serves as a reference as well as powering the IP1524’s
internal control circuitry and is also useful in supplying
external support functions. This reference voltage is
lowered externally by a resistor divider to provide a
reference within the common-mode range of the error
amplifier or an external reference may be used. The
power supply output is sensed by a second resistor
divider network to generate a feedback signal to the
error amplifier. The amplifier output voltage is then
compared to the linear voltage ramp at CT. The
resulting modulated pulse out of the high-gain
comparator is then steered to the appropriate output
pass transistor (Q1or Q2) by the pulse-steering flip-flop,
which is synchronously toggled by the oscillator output.

The oscillator output pulse also serves as a blanking
pulse to assure both outputs are never on
simultaneously during the transition times.

The width of the blanking pulse is controlled by the

value of CT.

The outputs may be applied in a push-pull
configuration in which their frequency is half that of the
base oscillator, or paralleled for single-ended
applications in which the frequency is equal to that of
the oscillator. The output of the error amplifier shares a
common input to the comparator with the current
limiting and shutdown circuitry and can be overridden
by signals from either of these inputs.

This common point is also available externally and
may be employed to control the gain of, or to
compensate, the error amplifier, or to provide additional
control to the regulator.

REF

V

R

T

C

T

INV.

N.I.

OSC.

SH.DOWN COM P.

C

A

E

A

E

B

C

B

C +

L

C -

L

IN

V

GND

+28V

RETURN

GND

+5V
1A

0.1µF

0.02µF

0.1

Ω

500µF

1N3880

Ω

5k

Ω

5k

Ω

5k

Ω

5k

Ω

3k

0.001µF

Ω

68

Ω

150

Ω

2k

Ω

50k

0.9mH

REF

V

R

T

C

T

INV.

N.I.

OSC.

SH.DOWN COMP.

C

A

E

A

E

B

C

B

C +

L

C -

L

IN

V

GND

+28V

RETURN

0.1µF

0.01µF

Ω

5k

Ω

5k

Ω

5k

Ω

5k

0.001µF

1mH

Ω

2k

Ω

20k

Ω

1k1WΩ

1k

1W

Ω

1k

Ω

1k

20

T

20

T

100µF

0.1

Ω

5

T
5

T

5V
5A

100µF

In this conventional single-ended regulator circuit, the two outputs of
the IP1524 are connected in parallel for effective 0-90% duty cycle
modulation. The use of an output inductor requires an R-C phase
compensation network for loop stability.

Push-pull outputs are used in this transformer-coupled DC-DC
regulating converter. Note that the oscillator must be set at twice the
desired output frequency as the IP1524’s internal flip-flop divides the
frequency by 2 as it switches the PWM signal from one output to the
other. Current limiting is done in the primary so that the pulse width will
be reduced should transformer saturation occur.

LAB

SEME

IP1524 SERIES

Semelab plc. Telephone [phone]. Telex: 341927. Fax [phone].

Prelim. 3/95

OPEN LOOP VOLTAGE AMPLIFICATIO N (dB)

-10

0

10

20

30

40

50

60

70

80

90

100 1k 10k 100k 1M 10M

FREQUENCY (Hz)

R = 300k

Ω

L

R = 100k

Ω

L

IN

V = 20V

J

T = 25˚C

Note:

Value of R below 30k

Ω

will begin to

limit the maximum duty cycle.

L

R =

∞

L

R = 1M

Ω

L

R = 30k

Ω

L

1 2 5 10 20 50 100

100

1k

10k

100k

1M

OSCILLATOR FREQUENCY (Hz)

R TIMING RESISTOR (kΩ)

IN

V = 20V

J

T = 25˚C

T

C

=

0

.

1

µ

F

C

=

0

.

0

3

µ

F

C

=

0

.

0

1

µ

F

C

=

0

.

0

0

3

µ

F

C

=

0

.

0

0

1

µ

F

T

T

T

T

T

TYPICAL PERFORMANCE CHARACTERISTICS

Open-Loop Voltage Amplification

of Error Amplifier vs. Frequency

Oscillator Frequency vs.

Timing Components

1

10

OUTPUT DEAD TIME (

µ

s)

0.001 0.01 0.1

0.1

C TIMING CAPACITOR (

µ

F)

T

IN

V = 20V

J

T = 25˚C

Note:

Dead T i me = Osc illator o utput pulse width
plus output delay.

J

0

1

2

3

4

COLLECTOR – EMITTER VOLTAGE (V)

0 20406080100

LOAD CURRENT (mA)

IN

V = 20V

T

=

1

2

5

˚

C

T

=

2

5˚

C

J

T

=

-

5

5

˚

C

J

Output Dead Time vs.

Timing Capacitance Value

Output Saturation Voltage vs.

Load Current