Seme LAB IP1524B Regulating pulse width modulator Datasheet

IP1524B SERIES
SEME
LAB
REGULATING
PULSE WIDTH
MODULATORS
TOP VIEW
INV. INPUT 1
16
VREF
N. I. INPUT 2
15
VIN
OSC. OUTPUT 3
14
EB
+C.L. SENSE 4
13
CB
–C.L. SENSE 5
12
CA
RT 6
11
EA
CT 7
10
SHUTDOWN
GROUND 8
9
FEATURES
COMPENSATION
J Package – 16 Pin Ceramic DIP
N Package – 16 Pin Plastic DIP
D Package – 16 Pin Plastic (300) SOIC
•
•
•
•
•
•
•
•
•
•
•
•
Pin Compatible with IP1524 Series
7 to 40 volt operation
5 volt reference trimmed to ±1%
Undervoltage lockout
Excellent external sync capability
Wide current limit common mode range
+5 Volt error amplifier common mode
PWM data latch
Full double-pulse suppression logic
50ns shutdown function
Dual 200mA, 60V output transistors
Fully specified over temperature
Order Information
Part
Number
IP1524B
IP2524B
IP3524B
J–Pack
16 Pin
✔
✔
✔
N–Pack
16 Pin
D–16
16 Pin
✔
✔
✔
✔
Temp.
Range
-55 to +125°C
-25 to +85°C
0 to +70°C
Note:
To order, add the package identifier to the part number.
eg.
IP1524BJ
IP3524BD–16
ABSOLUTE MAXIMUM RATINGS (Tcase = 25°C unless otherwise stated)
+VIN
Input Voltage
+40V
Collector Voltage
+60V
Logic Inputs
–0.3 to +5.5V
Current Limit Sense Inputs
–0.3 to +VIN
Oscillator Charging Current
5mA
PD
Power Dissipation
TA = 25°C
Derate @ TA > 50°C
1W
10mW/°C
PD
Power Dissipation
TC = 25°C
Derate @ TC > 25°C
2W
16mW/°C
TJ
Operating Junction Temperature
TSTG
Storage Temperature Range
TL
Lead Temperature
Semelab plc.
See Ordering Information
–65 to +150°C
(soldering, 10 seconds)
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
+300°C
Prelim. 3/95
IP1524B SERIES
SEME
LAB
DESCRIPTION
The IP1524B is a pulse width modulator for switching power supplies which features improved performance over
industry standards like the SG1524. A direct pin-for-pin replacement for the earlier device, it combines advanced
processing techniques and circuit design to provide improved reference accuracy/ and extended common mode range at
the error amplifier and current limit inputs. A DC-coupled flip-flop eliminates triggering and glitch problems, and a PWM
data latch prevents edge oscillations. The circuit incorporates true digital shutdown for high speed response, while an
undervoltage lockout circuit prevents spurious outputs when the supply voltage is too low for stable operation. Full
double-pulse suppression logic insures alternating output pulses when the shutdown pin is used for pulse-by-pulse
current limiting.
BLOCK DIAGRAM
VREF
16
15
+VIN
UNDER
VOLTAGE
LOCKOUT
REFERENCE
REGULATOR
8
GND
TO INTERNAL
CIRCUITRY
RT
CT
OSC.
7
12
3
6
CA
OSCILLATOR
S
11
Q
EA
T
R
INV.
INPUT
N.I.
INPUT
+C.L.
SENSE
–C.L.
SENSE
2
Q
13
TOGGLE
F/F
CB
D
PWM
14
Q
ERROR
EB
PWM
LATCH
4
5
MEMORY
F/F
S Q
1
Q
C.L.
10
9
SHUTDOWN
COMPENSATION
RECOMMENDED OPERATING CONDITIONS
VIN
Input Voltage
+7 to +40V
Collector Voltage
0 to +60V
Error Amp Common Mode Range
+2.3 to VREF
Current Limit Sense Common Mode Range
Output Current
0 to VIN – 2.5V
(each transistor)
Reference Load Current
0 to 200mA
0 to 20mA
Oscillator Charging Current
25µA to 1.8mA
Oscillator Frequency Range
50Hz to 500kHz
RT
Oscillator Timing Resistor
2kΩ to 150kΩ
CT
Oscillator Timing Capacitor
1nF to 0.1µF
Operating Ambient Temperature Range
Semelab plc.
IP1524B
IP2524B
IP3524B
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
–55 to +125°C
–25 to +85°C
0 to +70°C
Prelim. 3/95
IP1524B SERIES
SEME
LAB
ELECTRICAL CHARACTERISTICS (TJ = Over Operating Temperature Range unless otherwise stated)
IP1524B
IP2524B
Min.
Typ. Max.
Test Conditions 1
Parameter
Min.
IP3524B
Typ. Max.
Units
TURN–ON CHARACTERISTICS
VIN Undervoltage Threshold VIN Rising
4.3
5.2
6.5
4.3
5.2
6.5
Turn–on Hysteresis
0.1
0.3
0.6
0.1
0.3
0.6
7
10
7
10
5.00
5.05
4.90
5.00
5.10
5.10
4.85
VIN = 7 to 40V
Operating Current
V
mA
REFERENCE SECTION
TJ = 25°C
Output Voltage
VIN = 7 to 40V
4.95
IL = 0 to 20mA
4.90
5.15
Line Regulation
VIN = 7 to 40V
1
10
1
15
Load Regulation
IL = 0 to 20mA
5
15
5
25
40
75
40
75
70
120
70
120
1
10
43
45
0.1
Temperature Stability
Short Circuit Current
VREF = 0
Long Term Stability
TJ = 25°C
25
OSCILLATOR SECTION
Initial Accuracy
TJ = 25°C
Voltage Stability
VIN = 7 to 40V
25
V
mV
mA
mV
1
khr
2
41
Temperature Stability
39
43
47
1
0.1
1
1
2
1
2
80
140
80
140
kHz
%
Minimum Frequency
RT = 150kΩ
CT = 0.1µF
Maximum Frequency
RT = 2kΩ
CT = 470pF
400
700
400
700
kHz
Clock Amplitude
Output, Pin 3
CT = 0.01µF
3.0
4.0
3.0
4.0
V
Clock Pulse Width
Output, Pin 3
CT = 0.01µF
0.4
0.5
1.2
0.4
0.5
1.2
Sawtooth Peak Voltage
CT = 0.01µF
3.7
4.0
3.7
4.0
Sawtooth Valley Voltage
CT = 0.01µF
1
1.1
1
1.1
Sawtooth Valley T.C.
TJ = 25°C
0.6
0.6
µs
V
mV/°C
-1
-1
Hz
ERROR AMP SECTION
Input Offset Voltage
VCM = 2.3 to VREF
0.1
5
2
10
Input Bias Current
VCM = 2.3 to VREF
1
5
1
10
Input Offset Current
VCM = 2.3 to VREF
0.1
1
0.1
1
mV
µA
NOTES
1. Test Conditions unless otherwise stated:
VIN = 20V , IREF = 0.
TJ = –55 to +125°C for IP1524B
TJ = –25 to +85°C for IP2524B
for IP3524B
TJ = 0 to +70°C
Semelab plc.
2. RT = 2.7KΩ , CT = 0.01µF unless otherwise stated.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
IP1524B SERIES
SEME
LAB
ELECTRICAL CHARACTERISTICS (TJ = Over Operating Temperature Range unless otherwise stated)
IP1524B
IP2524B
Min.
Typ. Max.
Test Conditions 1
Parameter
Min.
IP3524B
Typ. Max.
Units
ERROR AMP SECTION (cont.)
DC Open Loop Gain
∆VO = 1 to 3V
Common Mode Rejection
RL ≥ 10MΩ
60
75
60
75
VCM = 2.3 to VREF
70
90
70
90
Supply Voltage Rejection
VIN = 7 to 40V
76
120
76
120
Output Low Level
ISINK = 100µA
Output High Level
ISOURCE = 100µA
Gain Bandwidth Product
TJ = 25°C
0.2
0.2
0.5
3.8
4.2
3.8
4.2
1
2
1
2
dB
0.5
V
MHz
PWM COMPARATOR
Minimum Duty Cycle
VPIN1 – VPIN2 ≥ 150mV
Maximum Duty Cycle
VPIN2 – VPIN1 ≥ 150mV
0
0
45
49
180
200
220
-1
-10
%
45
49
180
200
220
mV
-1
-10
µA
CURRENT LIMIT AMPLIFIER
VCM = 0 to 17.5V
Sense Voltage
VIN = 7 to 40V
VCM = 0 to 17.5V
Input Bias Current
VIN = 7 to 40V
SHUTDOWN INPUT
VSHUTDOWN = 5V
High Input Current
V
2.0
2.0
High Input Voltage
0.1
0.1
1
0.6
Low Input Voltage
Pin 10 to output
Shutdown Delay
TJ = 25°C
1
mA
0.6
V
ns
50
50
OUTPUT SECTION (each transistor)
Collector Leakage Current
Collector Saturation Voltage
Emitter Output Voltage
VCE = 60V
0.1
20
0.1
20
IC = 20mA
0.2
0.4
0.2
0.4
IC = 200mA
1.0
2.2
1.0
2.2
IE = 50mA
17
19
17
19
IE = 200mA
16.5
18
16.5
18
Emitter Voltage Rise Time
RE = 2kΩ
TJ = 25°C
0.2
0.4
0.2
Collector Voltage Fall Time
RC = 2kΩ
TJ = 25°C
0.1
0.2
0.1
µA
V
V
µs
NOTES
1. Test Conditions unless otherwise stated:
VIN = 20V , IREF = 0.
TJ = –55 to +125°C for IP1524B
TJ = –25 to +85°C for IP2524B
for IP3524B
TJ = 0 to +70°C
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
IP1524B SERIES
SEME
LAB
APPLICATIONS INFORMATION
Current Sensing in the Output Line
Current Sensing in the Ground Line
+VOUT
–C.L.
+C.L.
5
RSENSE
RAW
SUPPLY
GND
4
8
12
CA
100Ω
RAW
SUPPLY
RETURN
+VOUT
13
CB
4
5
+C.L.
–C.L.
RETURN
RETURN
RSENSE
Sensing Primary Current
with an Emitter Resistor
Oscillator Sync to an External Clock
16
EB
14
16
EA
11
3
TTL
CMOS
1N914
2N2369
3.2kΩ
+C.L.
3
4
3.2kΩ
RSENSE
–C.L.
5
A. TTL Logic
B. 5 Volt CMOS Logic
Driving Power Bipolar Transistors
Driving Power MOSFETs
+15V
1.6kΩ
12
11
12
TO
LOAD
D1
Q2
Q1
1.6kΩ
Semelab plc.
TO
LOAD
0.01µF
11
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Q1
4.7kΩ
Prelim. 3/95
IP1524B SERIES
SEME
LAB
TYPICAL PERFORMANCE CHARACTERISTICS
Semelab plc.
Oscillator Frequency vs.
Timing Components
Output Dead Time vs.
Timing Capacitance Value
Pulse Width Modulation
Transfer Function
Output Saturation Voltage
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
IP1524B SERIES
SEME
LAB
TYPICAL PERFORMANCE CHARACTERISTICS
Error Amplifier Voltage Gain
vs. Frequency
Semelab plc.
Undervoltage Lockout Characteristics
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
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