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| 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 VCC VZ FEEDBACK 1 2 3 4 8 7 6 5 GND OUTPUT CURRENT SENSE RT, CT FEATURES GAIN * Micro-miniature (D) package * Pulse width modulator * Current limiting (cycle by cycle) * Sawtooth generator * Stabilized power supply * Double-pulse protection * 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 * Switch mode power supplies * DC motor controller inverter * DC/DC converter TEMPERATURE RANGE 0 to +70C 0 to +70C ORDER CODE NE5568N NE5568FE DWG # SOT97-1 0580A BLOCK DIAGRAM RT, CT 5 REF VOLTAGE SAWTOOTH GENERATOR VCC + ERROR AMP FEEDBACK GAIN 0.5V 3 4 - - PWM S LATCH R 7 OUTPUT STABILIZED SUPPLY 1 8 GND 8.2V 2 VZ CURRENT 6 SENSE + VCC SL00438 Figure 2. Block Diagram ABSOLUTE MAXIMUM RATINGS SYMBOL VCC IOUT PD TA 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 C 1994 Aug 31 1 853-0890 13721 Philips Semiconductors Product specification Switched-mode power supply controller NE5568 DC ELECTRICAL CHARACTERISTICS VCC=12V, TA=25C, unless otherwise specified. SYMBOL Reference section VREF VZ Internal reference voltage Internal zener ref Temperature coefficient of VREF Temperature coefficient of VZ Oscillator section f Frequency range Initial accuracy Duty cycle range Current limiting IIN Input current Pin 6=250mV TA=25C Over temp. Single pulse inhibit delay Inhibit delay time for 20% overdrive at IOUT=20mA IOUT=40mA Current limit trip level Error amplifier Open-loop gain Feedback resistor BW VOH VOL IOUT VCE Small-signal bandwidth Output voltage swing Output voltage swing 6.2 0.7 10k 3 60 dB MHz V V 0.400 0.88 0.7 0.500 -2 -10 -20 1.10 0.8 0.600 A A s s V Over temperature RT and CT Constant fo=20kHz 0 50 5 98 100k Hz % % IL=7mA TA=25C Over temperature 3.69 3.66 7.8 8.2 100 200 3.75 3.84 3.87 8.8 V V V ppm/C ppm/C PARAMETER TEST CONDITIONS NE5568 Min Typ Max UNIT Output stage Output current Saturation Over temperature IC=20mA, over temperature IC=40mA, over temperature Supply voltage/current ICC VCC Supply current IZ=0, voltage-fed TA=25C Over temp. Supply voltage IS=10mA, current-fed ICC=30mA, current-fed Low supply protection Pin 1 threshold NOTES: All curves and applications of NE5561 apply exactly 8.0 9.0 10.5 V 19.0 20.0 21.0 10.0 13.0 24.0 30.0 mA mA V V 20 0.4 0.5 mA V V 1994 Aug 31 2 |
Price & Availability of NE5568
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