C2162PX2 Schematic ( PDF Datasheet ) - Cambridge Semiconductor

Teilenummer	C2162PX2
Beschreibung	Primary Sensing SMPS Controller
Hersteller	Cambridge Semiconductor
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Gesamt 13 Seiten C2161PX2 and C2162PX2 Datasheet Primary Sensing SMPS Controller For Offline Applications ADVANTAGES  Low cost bipolar primary switch  Tight tolerance CV/CC operation  Low component count  High efficiency (Energy Star 2.0 compliance with margin)  < 30 mW no-load power consumption (Five star rating)  Programmable maximum switching frequency  Programmable output cable compensation up to 10% C2161PX2 C2162PX2 SOT23-6 FEATURES  Advanced primary sensing controller achieves true CV/CC output characteristic without opto-coupler  Full featured protection for over-temperature, input over-voltage, input under-voltage, output short-circuit  Advanced PFM/PWM control and quasi-resonant switching for increased efficiency  Switching timing jitter spreads RF spectral emissions, eases EMC compliance  SOT23-6 package APPLICATIONS Universal input mobile phone and USB chargers. Universal standby and auxiliary power supplies up to 8 W using C2162PX2 (up to 4 W using C2161PX2). Figure 1: Typical Application Circuit Preliminary © Cambridge Semiconductor Ltd 2009 Page 1 DS-2918-0906 12-Jun-2009 C2161PX2 and C2162PX2 Datasheet Primary Sensing SMPS Controller For Offline Applications Switching Waveforms Typical switching waveforms for the FB, CS and RC inputs are shown with the ED output in Figure 7. Figure 7: Typical Waveforms: ED, FB, CS, RC pins Constant Voltage (CV) Regulation Constant voltage regulation is achieved by sensing the FB input, which is AC coupled to the auxiliary winding of the transformer, as shown in Figure 4. The FB pin is internally biased to VFBBIAS. A typical voltage waveform seen on this pin is shown in Figure 7. The waveform is analysed and sampled at tSAMP to derive an estimate of the reflected output voltage. The tSAMP point is identified by the change in slope of the transformer auxiliary winding waveform (as sensed by the FB input) immediately prior to the zero crossing. The difference between the sampled voltage and the FB regulation voltage (VFBREG) is used to derive the system power demand and close the voltage control loop. The regulated output voltage is determined by the selection of the potential divider resistors (Rfb1, Rfb2 in Figure 4) and the chosen transformer turns ratio. The total parallel combination of these resistors should be typically less than 120 Ω to prevent unwanted effects of stray capacitance. The tolerances of Rfb1 and Rfb2 effect output voltage regulation and would typically be chosen to be 1% or better. Values of Rfb1, Rfb2 and Cfb are given by the equations: Rfb2 = 120 Ω Cfb = 47nF ± 20% Rfb1  Rfb2 VOUTNOM NA NS  ΔVFBREG ΔVFBREG  Preliminary © Cambridge Semiconductor Ltd 2009 Page 6 DS-2918-0906 12-Jun-2009 6 Page C2161PX2 and C2162PX2 Datasheet Primary Sensing SMPS Controller For Offline Applications THERMAL CIRCUIT PROTECTION Parameter Thermal shutdown temperature Thermal shutdown hysteresis Symbol Condition TSH At silicon junction TSHHYST At silicon junction Min Typ Max Unit 105 115 125 °C 30 °C PACKAGE THERMAL RESISTANCE CHARACTERISTICS Conditions: 1. Controller IC mounted on typical PCB (1.6 mm thick, 35 µm copper, CEM1); 2. θJB measured to pin terminal of device at the surface of the PCB. Package SOT23-6 Junction-to-board θJB (Typical) 60 Junction-to-ambient θJA (Typical) 170 Units °C / W PACKAGING AND ORDERING INFORMATION Package Marking The SOT23-6 package is marked with a short code indicating type and production lot as shown in Figure 8. Type code (PH or PL) PXXX Lot dependent code (varies) Ordering Figure 8: SOT23-6 Package Marking Type Package Marking Packing Form Shipping C2162PX2 SOT23-6 PHxx 7” Tape & Reel C2162PX2-TR7 13” Tape & Reel C2162PX2-TR13 C2161PX2 SOT23-6 PLxx 7” Tape & Reel C2161PX2-TR7 13” Tape & Reel C2161PX2-TR13 For further package and ordering information, please contact CamSemi. Preliminary © Cambridge Semiconductor Ltd 2009 Page 12 DS-2918-0906 12-Jun-2009 12 Page
Seiten	Gesamt 13 Seiten
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