NE5568 Datasheet, PDF (1/2 Pages) NXP Semiconductors – Switched-mode power supply controller

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
V_CC ¹
V_Z 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
R_T, C_T
5
SAWTOOTH
GENERATOR
V_CC
+
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
V_CC
GND
Figure 2. Block Diagram
SL00438
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
V_CC
I_OUT
Supply voltage
Output current
Output duty cycle
P_D
Max total power dissipation
T_A
Operating temperature range
RATING
18
40
98
0.75
0 to 70
UNIT
V
mA
%
W
°C
1994 Aug 31
1
853-0890 13721