NE5561 Datasheet, PDF (1/5 Pages) NXP Semiconductors – Switched-mode power supply control circuit

Philips Semiconductors
Switched-mode power supply control circuit
Product specification
NE/SE5561
DESCRIPTION
The NE5561/SE5561 is a control circuit for use in switched-mode
power supplies. It contains an internal temperature- compensated
supply, PWM, sawtooth oscillator, overcurrent sense latch, and
output stage. The device is intended for low cost SMPS applications
where extensive housekeeping functions are not required.
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
D, FE, N Packages
V_CC 1
V_Z ²
FEEDBACK ³
GAIN ⁴
8 _GND
7 OUTPUT
6 _{CURRENT SENSE}
5 _{RT, CT}
Figure 1. Pin Configuration
APPLICATIONS
• Switched-mode power supplies
• DC motor controller inverter
• DC/DC converter
ORDERING INFORMATION
DESCRIPTION
8-Pin Plastic Dual In-Line Package (DIP)
8-Pin Plastic Dual In-Line Package (DIP)
8-Pin Ceramic Dual In-Line Package (CERDIP)
8-Pin Small Outline (SO) Package
TEMPERATURE RANGE
0 to +70°C
-55 to +125°C
-55 to +125°C
0 to +70°C
ORDER CODE
NE5561N
SE5561N
SE5561FE
NE5561D
DWG #
SOT97-1
SOT97-1
0580A
SOT96-1
BLOCK DIAGRAM
REF
VOLTAGE
R_T, C_T
5
SAWTOOTH
GENERATOR
V_CC
+
ERROR
AMP
FEEDBACK ³ –
GAIN ⁴
0.5V
–
6
CURRENT
+
SENSE
PWM
S
LATCH
R
7
OUTPUT
STABILIZED
SUPPLY
8.2V
2 ^VZ
1
8
V_CC
GND
Figure 2. Block Diagram
SL00385
1994 Aug 31
1
853-0889 13721