Philips Semiconductors
Product specification
Switched-mode power supply controller
NE5568
DESCRIPTION
The NE5568 is a control circuit for use in switched mode power
supplies. It contains an internal temperature-compensated supply,
PWM, sawtooth oscillator, over-current sense latch, and output
stage. The device is intended for low cost SMPS applications where
extensive housekeeping functions are not required. The NE5568 is
a selected version of the NE5561.
PIN CONFIGURATION
FE, N Packages
V
CC
V
Z
FEEDBACK
1
2
3
4
8
7
6
5
GND
OUTPUT
CURRENT SENSE
R
T
, C
T
FEATURES
GAIN
鈥?/div>
Micro-miniature (D) package
鈥?/div>
Pulse width modulator
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Current limiting (cycle by cycle)
鈥?/div>
Sawtooth generator
鈥?/div>
Stabilized power supply
鈥?/div>
Double-pulse protection
鈥?/div>
Internal temperature-compensated reference
ORDERING INFORMATION
DESCRIPTION
8-Pin Plastic Dual In-Line Package (DIP)
8-Pin Cerdip Dual In-Line Package (CERDIP)
TOP VIEW
SL00437
Figure 1. Pin Configuration
APPLICATIONS
鈥?/div>
Switch mode power supplies
鈥?/div>
DC motor controller inverter
鈥?/div>
DC/DC converter
TEMPERATURE RANGE
0 to +70擄C
0 to +70擄C
ORDER CODE
NE5568N
NE5568FE
DWG #
SOT97-1
0580A
BLOCK DIAGRAM
R
T
, C
T
5
REF
VOLTAGE
SAWTOOTH
GENERATOR
V
CC
+
ERROR
AMP
FEEDBACK
GAIN
0.5V
3
4
鈥?/div>
鈥?/div>
PWM
S
LATCH
R
7
OUTPUT
STABILIZED
SUPPLY
1
8
GND
8.2V
2
V
Z
CURRENT 6
SENSE
+
V
CC
SL00438
Figure 2. Block Diagram
ABSOLUTE MAXIMUM RATINGS
SYMBOL
V
CC
I
OUT
P
D
T
A
Supply voltage
Output current
Output duty cycle
Max total power dissipation
Operating temperature range
PARAMETER
RATING
18
40
98
0.75
0 to 70
UNIT
V
mA
%
W
擄C
1994 Aug 31
1
853-0890 13721
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