《SC1271K 原厂规格书.pdf》由会员分享，可在线阅读，更多相关《SC1271K 原厂规格书.pdf（10页珍藏版）》请在金锄头文库上搜索。
1、SC1271K InnoSwitch Family June 2015 Off-Line CV/CC Flyback Switcher IC with Integrated MOSFET, Synchronous Rectification and Feedback This Product is Covered by Patents and/or Pending Patent Applications. Product Highlights Highly Integrated, Compact Footprint Incorporates flyback controller, 725 V
2、MOSFET, secondary-side sensing and synchronous rectification driver Integrated FluxLink, HIPOT-isolated, feedback link Exceptional CV/CC accuracy, independent of transformer design or external components Instantaneous transient response 5% CV with 0%-100%-0% load step EcoSmart Energy Efficient 3,500
3、 VAC UL1577 and TUV (EN60950) safety approved EN61000-4-8 (100 A/m) and EN61000-4-9 (1000 A/m) compliant Green Package Halogen free and RoHS compliant Applications Chargers and adapters for smart mobile devices High efficiency, low voltage, high current power supplies Description The InnoSwitch fami
4、ly of ICs dramatically simplifies the development and manufacturing of low-voltage, high current power supplies, particularly those in compact enclosures or with high efficiency require- ments. The InnoSwitch architecture is revolutionary in that the devices incorporate both primary and secondary co
5、ntrollers, with sense elements and a safety-rated feedback mechanism into a single IC. Close component proximity and innovative use of the integrated communication link permit accurate control of a secondary-side synchronous rectification MOSFET and optimization of primary-side switching to maintain
6、 high efficiency across the entire load range. Additionally, the minimal DC bias requirements of the link enables the system to achieve less than 10 mW no-load in challenging applications such as smart-mobile device chargers. Output Power Table Product3 85-265 VAC Adapter1 Peak or Open Frame2 SC1271
7、K20 W25 W Table 1. Output Power Table. Notes: 1. Minimum continuous power in a typical non-ventilated enclosed typical size adapter measured at 40 C ambient. Max output power is dependent on the design. With condition that package temperature must be = 125 C. 2. Minimum peak power capability. 3. Pac
8、kage: eSOP-R16B. Figure 2. High Creepage, Safety-Compliant eSOP Package. PI-7519-020615 Secondary Control IC SR FET Primary FET and Controller D SIS VOUT BPS FB GND SR BPP FWD InnoSwitch IO VO 12 9 5 Constant Voltage (CV) Constant Current (CC) 100%75% PI-7146-121213 (a) Typical Application Schematic
9、 (b) Output Characteristic Figure 1. Typical Application/Performance. TEL:13640986360 QQ:2689695616 TEL:15919907691 Wang.R Rev. B 06/15 2 SC1271K Figure 4. Secondary-Side Controller Block Diagram. Figure 3. Primary-Side Controller Block Diagram. PI-7433-112014 SR THESHOLD 4.45 V 3.80 V IS THRESHOLD
10、ENB HAND SHAKE PULSES FORWARD (FWD) TO RECEIVER SECONDARY GROUND (GND) OUTPUT VOLTAGE (VO) SCONDARY BYPASS (BPS) FEEDBACK (FB) ISENSE (IS) SYNC RECT (SR) + - + - + - + - S R Q Q CABLE COMPENSATION DETECTOR FEEDBACK DRIVER ENABLE SR CONTROL CLOCK OSCILLATOR REGULATOR 4.45 V PI-7432-110414 CLOCK OSCIL
11、LATOR 5.95 V 5.39 V SOURCE (S) S R Q DCMAX PRIMARY BYPASS (BPP) + - VILIMIT FAULT PRESENT PRI/SEC PULSE DCMAXS CURRENT LIMIT COMPARATOR LEADING EDGE BLANKING THERMAL SHUTDOWN + - DRAIN (D) BYPASS PIN UNDERVOLTAGE RECEIVER CONTROLLER Q RESET AUTO- RESTART COUNTER JITTER BYPASS CAPACITOR SELECT AND CU
12、RRENT LIMIT STATE MACHINE OVP LATCH REGULATOR 5.95 V FROM FEEDBACK DRIVER 6.4 V 20 Rev. B 06/15 3 SC1271K Figure 5. Pin Configuration. Pin Functional Description DRAIN (D) Pin (Pin 1) This pin is the power MOSFET drain connection. SOURCE (S) Pin (Pin 3-6) This pin is the power MOSFET source connecti
13、on. It is also the ground reference for the BYPASS and FEEDBACK pins. PRIMARY BYPASS (BPP) Pin (Pin 7) It is the connection point for an external bypass capacitor for the primary IC supply. FORWARD (FWD) Pin (Pin 10) The connection point to the switching node of the transformer output winding for se
14、nsing and other functions. OUTPUT VOLTAGE (VOUT) Pin (Pin 11) This pin is connected directly to the output voltage of the power supply to provide bias to the secondary IC. SYNCHRONOUS RECTIFIER DRIVE (SR) Pin (Pin 12) Connection to external SR FET gate terminal. SECONDARY BYPASS (BPS) Pin (Pin 13) I
15、t is the connection point for an external bypass capacitor for the secondary IC supply. FEEDBACK (FB) Pin (Pin 14) This pin connects to an external resistor divider to set the power supply CV voltage regulation threshold. PI-7398-110714 NC 10 FWD 11 VOUT 12 SR 13 BPS 14 FB 15 GND 16 ISD 1 S 3-6 BPP
16、7 NC SECONDARY GROUND (GND) (Pin 15) Ground connection for the secondary IC. ISENSE (IS) Pin (Pin 16) Connection to the power supply output terminals. Internal current sense is connected between this pin and the SECONDARY GROUND pin. Rev. B 06/15 4 SC1271K Absolute Maximum Ratings1,2 DRAIN Pin Voltage .-0.3 V to 725 V DRAIN Pin Peak Current3 .1680 (3150) mA PRIMARY BYPASS
