NE5568 Просмотр технического описания (PDF) - Philips Electronics
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NE5568 Datasheet PDF : 2 Pages
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Philips Semiconductors
Switched-mode power supply controller
Product specification
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.
FEATURES
• Micro-miniature (D) package
• Pulse width modulator
• Current limiting (cycle by cycle)
• Sawtooth generator
• Stabilized power supply
• Double-pulse protection
• Internal temperature-compensated reference
PIN CONFIGURATION
FE, N Packages
VCC 1
VZ 2
FEEDBACK 3
GAIN 4
8 GND
7 OUTPUT
6 CURRENT SENSE
5 RT, CT
TOP VIEW
Figure 1. Pin Configuration
SL00437
APPLICATIONS
• Switch mode power supplies
• DC motor controller inverter
• DC/DC converter
ORDERING INFORMATION
DESCRIPTION
8-Pin Plastic Dual In-Line Package (DIP)
8-Pin Cerdip Dual In-Line Package (CERDIP)
TEMPERATURE RANGE
0 to +70°C
0 to +70°C
ORDER CODE
NE5568N
NE5568FE
DWG #
SOT97-1
0580A
BLOCK DIAGRAM
REF
VOLTAGE
RT, CT
5
SAWTOOTH
GENERATOR
VCC
+
ERROR
AMP
3
FEEDBACK –
GAIN 4
0.5V
–
CURRENT 6
SENSE
+
PWM
S
LATCH
R
7
OUTPUT
STABILIZED
SUPPLY
8.2V
2 VZ
1
8
VCC
GND
Figure 2. Block Diagram
SL00438
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
VCC
IOUT
Supply voltage
Output current
Output duty cycle
PD
Max total power dissipation
TA
Operating temperature range
RATING
18
40
98
0.75
0 to 70
UNIT
V
mA
%
W
°C
1994 Aug 31
1
853-0890 13721
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