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Philipss
Philipss

NE5560 Datasheet

Switched-mode power supply control circuit


NE5560 Datasheet Preview


Philips Semiconductors
Switched-mode power supply control circuit
Product specification
NE/SE5560
DESCRIPTION
The NE/SE5560 is a control circuit for use in switched-mode power
supplies. This single monolithic chip incorporates all the control and
housekeeping (protection) functions required in switched-mode
power supplies, including an internal temperature-compensated
reference source, internal Zener references, sawtooth generator,
pulse-width modulator, output stage and various protection circuits.
FEATURES
Stabilized power supply
Temperature-compensated reference source
Sawtooth generator
Pulse-width modulator
Remote on/off switching
Current limiting
Low supply voltage protection
Loop fault protection
Demagnetization/overvoltage protection
Maximum duty cycle clamp
Feed-forward control
External synchronization
ORDERING INFORMATION
DESCRIPTION
16-Pin Plastic Dual In-Line Package (DIP)
16-Pin Plastic Small Outline Large (SOL) Package
16-Pin Plastic Dual In-Line Package (DIP)
16-Pin Cerdip Dual In-Line Package (CERDIP)
ABSOLUTE MAXIMUM RATINGS
SYMBOL
Supply1
PARAMETER
VCC Voltage-forced mode
ICC Current-fed mode
Output transistor (at 20-30V max)
IOUT
Output current
Collector voltage (Pin 15)
Max. emitter voltage (Pin 14)
TA Operating ambient temperature range
SE5560
NE5560
TSTG
Storage temperature range
NOTES:
1. Does not include current for timing resistors or capacitors.
PIN CONFIGURATION
D, F, N Packages
VCC 1
VZ 2
FEEDBACK 3
GAIN 4
MODULATOR 5
16 FEEDFORWARD
15 OUTPUT (COLL)
14 OUTPUT (EMIT)
13 DEMAG: OVERVOLTAGE
12 GND
DUTY CYCLE CONTROL 6
RT 7
CT 8
11 CURRENT LIMITING
10 REMOTE ON/OFF
9 EXTERNAL SYNC
SL00360
Figure 1. Pin Configuration
TEMPERATURE RANGE
0 to 70°C
0°C to 70°C
-55°C to 125°C
-55°C to 125°C
ORDER CODE
NE5560N
NE5560D
SE5560N
SE5560F
DWG #
SOT38-4
SOT162-1
SOT38-4
0582B
RATING
+18
30
40
VCC+1.4V
+5
-55 to +125
0 to 70
-65 to +150
UNIT
V
mA
mA
V
V
°C
°C
°C
1994 Aug 31
1 853-0125 13721
Page 1

Philips Semiconductors
Switched-mode power supply control circuit
Product specification
NE/SE5560
BLOCK DIAGRAM
FEED
EXTERNAL
FORWARD RT CT SYNC INPUT
16 7 8
9
REFERENCE
VOLTAGE
SAWTOOTH
GENERATOR
FEEDBACK 3
VOLTAGE
4
GAIN ADJUST
MODULATOR 5
INPUT
+
+
CUTY CYCLE 8
CONTROL
0.6V
+
0.48V
0.6V
PULSE WIDTH
MODULATOR
+
+
100
1k
CURRENT 11
LIMITING
0.6V
0.48V
+
OC1
+
0.6V
10
REMOTE
ON/OFF
NOTE:
1. See Voltage/Current fed supply characteristic curve.
Figure 2. Block Diagram
DEMAGNETIZATION
OVER-VOLTAGE PROTECTION
13
0.6V
+–
VCC
S
LATCH
RQ
15
OUTPUTS
14
Q1
R START
S STOP
STABILIZED
SUPPLY
+
1
VCC
12
2 VZ
SL00361
1994 Aug 31
2
Page 2

Philips Semiconductors
Switched-mode power supply control circuit
Product specification
NE/SE5560
DC ELECTRICAL CHARACTERISTICS
TA=25°C, VCC=12V, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
Reference sections
VREF
Internal reference voltage
Temperature coefficient of VREF
VZ Internal Zener reference
Temperature coefficient of VZ
Oscillator section
Frequency range
Initial accuracy oscillator
Duty cycle range
Modulator
Modulation input current
Housekeeping function
IIN‘ Pin 6, input current
25°C
Over temperature
IL=-7mA
Over temperature
R=5k
fO=20kHz
Voltage at Pin 5=2V Over
temperature
At 2V
Over temperature
SE5560
NE5560
Min Typ Max Min Typ Max
3.69 3.72 3.81 3.57 3.72 3.95
3.65 3.85 3.53 4.00
-100
-100
7.8 8.4 8.8 7.8 8.4 8.8
200 200
50 100k 50 100k
55
0 98 0 98
0.2 20
0.2 20
0.2 20
0.2 20
UNIT
V
V
ppm/°C
V
ppm/°C
Hz
%
%
µA
µA
Pin 6, duty cycle limit control
For 50% max duty cycle
15kHz to 50kHz/41% of VZ 40
50
60
40
50
% of duty
60 cycle
Pin 1, low supply voltage
protection thresholds
8 9.0 10.5 8 9.0 10.5
V
Pin 3, feedback loop protection trip
threshold
400 600 720 400 600 720
mV
At 2V
Pin 3, pull-up current
-7 -15 -35 -7 -15 -35
µA
Pin 13,
demagnetization/over-voltage
protection trip on threshold
Over temperature
470 600 720 470 600 720
mV
At 0.25V
IIN Pin 13, input current
25°C
Over temperature
-0.6 -10
-20
-0.6 -10
-20
µA
Pin 16, feed-forward duty cycle
control
Voltage at Pin 16=2VZ
30
40
50
30
40
50
% original
duty cycle
*Pin 16, feed-forward input current
At 16V, VCC=18V
25°C
0.2 5
0.2 5
µA
Over temperature
10 10 µA
External synchronization
Pin 9 Off
0 0.8 0 0.8 V
On
Sink current
2 VZ 2 VZ
Voltage at Pin 9=0V, 25°C
-65 -100
-65 -125
V
µA
Over temperature
-125
-125
µA
Remote
Pin 10 Off
0 0.8 0 0.8 V
On 2 VZ 2 VZ V
At 0V
Sink current
25°C
Over temperature
-85 -100
-125
-85 -125
-125
µA
µA
1994 Aug 31
3
Page 3
Part Number NE5560
Manufactur Philipss
Description Switched-mode power supply control circuit
Total Page 16 Pages
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