NE5562D Philipss, NE5562D Datasheet
NE5562D
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NE5562D Summary of contents
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... Auxiliary comparator, with adjustable hysteresis Loop fault protection Demagnetization/overvoltage protection Duty cycle adjust and clamp Feed-forward control External synchronization Total shutdown after adjustable number of overcurrent faults Soft-start TEMPERATURE RANGE ORDER CODE 0 to +70 C NE5562D 0 to +70 C NE5562N - +125 C SE5562F 1 Product specification NE/SE5562 S SL00388 DWG # ...
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Philips Semiconductors Switched-mode power supply control circuit BLOCK DIAGRAM FEEDFORWARD + + – – + OFF ON REMOTE ON/OFF 6 ERROR AMP OUT 10 3.80V + FEEDBACK – VOLTAGE 8 ERROR AMP – 0.955V + LOOP FAULT ...
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Philips Semiconductors Switched-mode power supply control circuit ABSOLUTE MAXIMUM RATINGS SYMBOL Supply V voltage-fed mode (Pin 17 current-fed mode (Pin 7) CC Output transistor output current Sync (Pin 11) Duty cycle control (Pin 5) Remote on/off (Pin 6) ...
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Philips Semiconductors Switched-mode power supply control circuit DC AND AC ELECTRICAL CHARACTERISTICS V = 12V, specifications apply over temperature, unless otherwise specified. CC SYMBOL SYMBOL PARAMETER PARAMETER Reference V Zener voltage Z V Zener voltage Temperature ...
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Philips Semiconductors Switched-mode power supply control circuit DC AND AC ELECTRICAL CHARACTERISTICS V = 12V, specifications apply over temperature, unless otherwise specified. CC SYMBOL SYMBOL PARAMETER PARAMETER Error amp I Input bias current BIAS A DC open-loop gain VOL V ...
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Philips Semiconductors Switched-mode power supply control circuit DC AND AC ELECTRICAL CHARACTERISTICS V = 12V, specifications apply over temperature, unless otherwise specified. CC SYMBOL SYMBOL PARAMETER PARAMETER Auxiliary comparator with shutdown I Bias current BIAS Threshold voltage C Discharge current ...
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Philips Semiconductors Switched-mode power supply control circuit 100 100 100 ...
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Philips Semiconductors Switched-mode power supply control circuit 1994 Aug ...
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Philips Semiconductors Switched-mode power supply control circuit THE NE/SE5562 THEORY OF OPERATION INTRODUCTION Switched-mode power conversion relies on the principle of pulsed energy storage in an inductive or capacitive element. Capacitive switched converters are typically used with low power systems ...
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Philips Semiconductors Switched-mode power supply control circuit FEED- FORWARD +7.50V 3 2 CURRENT STEERING VOLTAGE FEEDBACK 8 THE NE/SE5562 THEORY OPERATION The Sawtooth Oscillator The sawtooth oscillator consists of a gated charge-discharge capacitor circuit with ...
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Philips Semiconductors Switched-mode power supply control circuit 35 A SAWTOOTH + V REF +3.80V + 8 – Figure 16. The Duty Cycle Control Circuit, Pulse Width Modulator, and Error Amplifier, Reference, and Output Latch 1994 Aug ...
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Philips Semiconductors Switched-mode power supply control circuit PIN 14 Figure 17. Duty Cycle vs Feedback Error and Overcurrent Sense The error amplifier’s non-inverting input is tied to a bandgap reference of 3.80V, accurate The temperature ...
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Philips Semiconductors Switched-mode power supply control circuit OFFSET 50 ADJUST 360 FEED-FORWARD COMPENSATION (PIN 1) To provide a means of automatically improving line-to-load voltage regulation, a technique called feed-forward ...
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Philips Semiconductors Switched-mode power supply control circuit V FFWD 2N3906 220k 0 NE/SE5562 Figure 21. Feed-forward Turn-On Delay Circuit + SYNC PIN 11 SYNC SIGNAL T O Figure 23. Sync Signal Relationship to Controlled Sawtooth Waveform DUTY CYCLE ...
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Philips Semiconductors Switched-mode power supply control circuit 2. Slow-start if remote ON/OFF is actuated, if OC2 threshold trips, demagnetization/overvoltage is sensed, or low supply voltage to the internal regulator is sensed (VS 8.45V). 3. Note that Pin 8 is monitored ...
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Philips Semiconductors Switched-mode power supply control circuit 0.1 0.2 0.3 0.6 0.7 0.4 0.5 Figure 25. Maximum Duty Cycle LOW SUPPLY SENSE R73 R74 10k 10k Q262 Q264 ...
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Philips Semiconductors Switched-mode power supply control circuit THE START-STOP CONTROL SEQUENCE The start-up circuit involves a sequential set of conditions which progresses as follows: power-up after OFF condition or remote ON after OFF. Initially, 0V exist on the supply output, ...
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Philips Semiconductors Switched-mode power supply control circuit DUAL-LEVEL OVERCURRENT COMPARATORS The overcurrent sensing circuit (Figure 29) consists of a single PNP input buffer with emitter-follower tied 7.50V, feeding into the Z base of an NPN split-emitter transistor. ...
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Philips Semiconductors Switched-mode power supply control circuit sawtooth oscillator. The complete sequence for an overcurrent fault may be understood by referring to Figure 32 for OC2. Here it is shown that an OC2 signal exists indicating that the 0.65V threshold ...
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Philips Semiconductors Switched-mode power supply control circuit 3.86V 0 DELAY 0.00V 100 200 OC1 DELAY TIME (MILLISECONDS) 3.66V DELAY 0.00V OC2 ...
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Philips Semiconductors Switched-mode power supply control circuit 8 (3 )(3.86V) Delay Time =10.7ms 3 10 Total cycles shutdown 6 2 =4280 Figure 35 shows an actual OC1 charging cycle ...
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... The NE5562N plastic package is capable of operating within the temperature range (ambient +70 C. This rating applies to the surface-mount product NE5562D also. Obviously, the power dissipation of the “D” package is lower than the standard DIP. Thermal resistance for the various packages are: 20-Pin plastic— ...
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Philips Semiconductors Switched-mode power supply control circuit V S VOLTAGE SOURCE V I CURRENT SOURCE - ( (15) D =330mW Solving for the temperature rise from ambient to the IC functions: Temperature rise = 61 C/W ...
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Philips Semiconductors Switched-mode power supply control circuit + V IN – NOTE: The P clamp winding prevents collector voltage from exceeding – Prevent Core Saturation Due to Flux Staircasing ...
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Philips Semiconductors Switched-mode power supply control circuit Frequency of Operation Estimate of Overall Efficiency 0. FWD SENSE 2N3906 40k 220k 10k 0. (PIN 9) V CLOCK Z 2 DELAY 7.50V 5.1k ...
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Philips Semiconductors Switched-mode power supply control circuit 33k 220k 6.8k 0. Figure 45. Shunt-Regulated Output With Bootstrap Supply 1994 Aug 31 +48V +17V 100 15V D40K2 NE/SE5562 n ...
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Philips Semiconductors Switched-mode power supply control circuit Development of Practical Flyback Converter Circuit TR1 NOTES: a. Unlimited choke ...
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Philips Semiconductors Switched-mode power supply control circuit 2N3906 0. SENSE 0’ 570pF + 3. NOTE: 400kHz operation with feed-forward line regulation and cycle-by-cycle current timing. 100 +3.80V I ’ S ...
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Philips Semiconductors Switched-mode power supply control circuit –15V +15V NE5018 D/A P REFERENCES 1. R.D. Middlebrook and Slobadan Cuk, Advances in Switched Mode Power Conversion, Volumes I and II, TESLA Co., Pasa- dena, CA, 1983. 2. Rudolf P. Stevens and ...