PDF SD4842 Data sheet ( Hoja de datos )

Número de pieza	SD4842
Descripción	(SD4840 - SD4844) Current Mode PWM Controller
Fabricantes	Silan Microelectronics
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No Preview Available ! SD4840/4841/4842/4843/4844 CURRENT MODE PWM CONTROLLER WITH BUILT-IN HIGH VOLTAGE MOSFET DESCRIPTION SD4840/4841/4842/4843/4844 is a current mode PWM controller with low standby power and low start current for power switch. In standby mode, the circuit enters burst mode to reduce the standby power dissipation. The switch frequency is 67KHz with ±2.5 KHz jitter frequency for low EMI. The stress on transformer during power on is reduced by the built- in 15ms soft start circuit to avoid the saturation of transformer. SD4840/4841/4842/4843/4844 includes under voltage lock-out, over voltage protection, leading edge blanking, over current protection and the temperature protection. The circuit will restart automatically until the system is normal after the protection is active. FEATURES * Lower start-up current (Typ.6μA) * Frequency jitter for low EMI * Overcurrent protection * Overvoltage protection * Undervoltage lockout * Built-in temperature protection * Built-in high voltage MOSFET www.DataSheet4AUu.ctoomrestart mode Built-in soft start * Burst mode operation * Cycle by cycle current limit APPLICATIONS * Switch power ORDERING INFORMATION Part No. Package Marking SD4840P67K65 SD4840P67K65 SD4841P67K65 SD4841P67K65 SD4842P67K65 DIP-8-300-2.54 SD4842P67K65 SD4843P67K65 SD4843P67K65 SD4844P67K65 SD4844P67K65 Note: P denotes it is available in DIP8 package, 67k denotes 67KHz, and 65 denotes withstand voltage is 650V. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.2 2008.12.17 Page 1 of 11 1 page SD4840/4841/4842/4843/4844 Characteristics Built-in Soft Start Time Current Limit SD4840P67K65 Peak Current Limit SD4841P67K65 SD4842P67K65 SD4843P67K65 SD4844P67K65 Burst mode Burst Mode High Voltage Burst Mode Low Voltage Protection Section Overvoltage Protection Thermal Shutdown Leading-edge Blanking Time Total Standby Current Start Current Supply Current (Control Part) Symbol Test conditions ts VFB=4V Iover Max. inductor current VBURH VBURL Vovp Tsd TLEB Istart Iop VCC=11V VCC=12V PIN CONFIGURATION Min. 10 Typ. 15 Max. 20 Unit ms 0.53 0.60 0.67 0.67 0.75 0.83 0.80 0.90 1.00 1.10 1.20 1.30 1.35 1.50 1.65 A 0.4 0.5 0.6 0.25 0.35 0.45 V V 18 19 125 140 200 -- -- -- -- V °C ns -- 6 20 μA 1 3 5 mA www.DataSheet4U.com PIN DESCRIPTION Pin No. 1 2 3 4 5 6,7,8 Pin Name SGND PGND VCC FB NC Drain I/O Function description - Ground for control part. - MOSFET Ground. - Power supply pin. I/O Feedback input pin. - Not connected. O Drain pins. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.2 2008.12.17 Page 5 of 11 5 Page SD4840/4841/4842/4843/4844 Attachment Revision History Data 2008.07.07 2008.11.06 2008.12.17 REV 1.0 1.1 1.2 Description Original Modify the “BLOCK DIAGRAM” and “FUNCTION DESCRIPTION” Add the note for “TYPICAL APPLICATION CIRCUIT” Page www.DataSheet4U.com HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.2 2008.12.17 Page 11 of 11 11 Page

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