SP6850

SP6850 Green-Mode PWM Controller DESCRIPTION The SP6850 is the current mode PWM controller with green-mode power-saving operation, to meet the low standby-power needs of low-power SMPS. This green-mode function enables the power supply to easily meet even the strictest power conservation requirements. The functions such as the leading-edge blanking of the current sensing, internal slope compensation and the small package provide the high efficiency / low cost for SMPS power applications. SP6850 is processed by BiCMOS fabrication, that enables reducing the start-up current and the operating current. SP6850 is available by SOT-23-6L / DIP-8P packages. APPLICATIONS AC/DC Switching Power Adaptor Battery Charger PC 5V Standby Power. Open-Frame Switching Power Supply FEATURES High-Voltage BiCMOS Process Very Low Startup Current (Typ ~ 8µA) Under Voltage Lockout (UVLO ) Current Mode Control with Cycle Peak Current Limiting Leading-Edge Blanking Programmable Switching Frequency Internal Slope Compensation Green-Mode Control for Power Saving Non-audible-noise Green Mode Control 300mA Driving Capability OVP (Over Voltage Protection) on Vcc Pin PIN CONFIGURATION SOT-23-6L DIP-8P PART MARKING SOT-23-6L DIP-8P 2007/04/10 Ver.3 Page 1 SP6850 Green-Mode PWM Controller TYPICAL APPLCATION CIRCUIT TYPICAL APPLCATION CIRCUIT ( High Efficiency SMPS + Synchronous Rectifier ) 2007/04/10 Ver.3 Page 2 SP6850 Green-Mode PWM Controller PIN DESCRIPTION SP6850D8TG Pin Symbol Description 1 OUT Gate driver output to drive the external MOSFET 2 VCC Supply Voltage in 3 NC Unconnected pin Current sense. This pin senses the voltage across a resistor, to control PWM output. This pin 4 CS also provides current amplitude information for current-mode control. 5 RT This current is used to charge an internal capacitor, to determine the switching frequency. 6 NC Unconnected pin Voltage feedback. The pin provides the output voltage regulation signal., it provides feedback 7 COMP to the internal PWM comparator, so that the PWM comparator can control the duty cycle. 8 GND Ground SP6850S26RG Pin Symbol Description 1 GND Ground Voltage feedback. The pin provides the output voltage regulation signal., it provides feedback 2 COMP to the internal PWM comparator, so that the PWM comparator can control the duty cycle 3 RT This current is used to charge an internal capacitor, to determine the switching frequency. Current sense. This pin senses the voltage across a resistor, to control PWM output. This pin 4 CS also provides current amplitude information for current-mode control 5 VCC Supply Voltage in 6 OUT Gate driver output to drive the external MOSFET BLOCK DIAGRAM 2007/04/10 Ver.3 Page 3 SP6850 Green-Mode PWM Controller ORDERING INFORMATION Part Number Package Part Marking SP6850I SP6850I 85AYW 850YW SP6850AD8TG DIP-8P SP6850BD8TG DIP-8P SP6850AS26RG SOT-23-6L SP6850BS26RG SOT-23-6L ※ SP6850AD8TG / SP6850BD8TG : Tube ; Pb – Free ※ SP6850AS26RG / SP6850BS26RG : Tape Reel ; Pb – Free ABSOULTE MAXIMUM RATINGS (TA=25℃, unless otherwise specified.) Symbol VCC VCOMP / RT / CS PD ESD Tope TJ TSTG TLEAD RӨJC Parameter DC Supply Voltage COMP / RT / CS Voltage Power Dissipation @ TA=85℃ (*) Human Body Model Machine Model Operating Ambient Temperature Operating Junction Temperature Range Storage Temperature Range Pb-Free Lead Soldering Temperature for 5 sec. Thermal Resistance Junction – Case (*) SOT-23-6L DIP-8P The following ratings designate persistent limits beyond which damage to the device may occur. Value 36 -0.3 ~ 7.0 0.3 4 300 -40 ~ 85 -40 ~ 150 -40 ~ 150 260 210 95 Unit V V W KV V ℃ ℃ ℃ ℃ ℃/W (*) The power dissipation and thermal resistance are evaluated under copper board mounted with free air conditions. 2007/04/10 Ver.3 Page 4 SP6850 Green-Mode PWM Controller ELECTRICAL CHARACTERISTICS (TA=25℃, VCC=15V, unless otherwise specified.) Symbol Parameter Supply Voltage ( Vcc Pin ) Istt Startup Current Iop Operating Current UVLO (off) Min. Operating Voltage UVLO (on ) Start Threshold Voltage OVP Level Over Voltage Protection Voltage Feedback ( Comp Pin ) Isc Short Circuit Current Vop Open Loop Voltage VTH(GM) Green Mode Threshold VCOMP Oscillator ( RT Pin ) FOSC Frequency FOSC(GM) Green Mode Frequency Fdt Frequency Variation versus Temp. Deviation Fdv Frequency Variation versus VCC Deviation Current Sensing ( CS Pin ) Vcs(off) Maximum Input Voltage Conditions VCOMP = 3V Min. Typ. 8 2 10.0 16.0 2.2 5.0 2.35 Max. 20 4 11.0 17.0 36 3.0 Unit uA mA V V V mA V V KHz KHz % % 9.0 15.0 28 RT=100KΩ Fs=65.0KHz (-40°C ~105°C) (VCC=11V-25V) SP6850BD8TG SP6850BS26RG SP6850AD8TG SP6850AS26RG 60.0 65.0 20 75.0 3 1 0.8 0.7 0.85 0.75 50 150 0.9 V 0.8 KΩ nS 80 1 % % V V Zcs Input impedance TPD Delay to Output Gate Driver Output ( OUT Pin ) DC (Max) Maximum Duty Cycle DC (Min) Minimum Duty Cycle VOL VOH Tr Tf 70 VCC=15V, Io=20mA VCC=15V, Io=20mA Load Cap=1000pF Load Cap=1000pF 75 0 Output Low Level Output High Level Rising Time Falling Time 8 50 30 200 120 nS nS 2007/04/10 Ver.3 Page 5 SP6850 Green-Mode PWM Controller PERFORMANCE CHARACTERISTICS (TA=25℃, unless otherwise specified.) 2007/04/10 Ver.3 Page 6 SP6850 Green-Mode PWM Controller PERFORMANCE CHARACTERISTICS (TA=25℃, unless otherwise specified.) 2007/04/10 Ver.3 Page 7 SP6850 Green-Mode PWM Controller DIP- 8P PACKAGE OUTLINE 2007/04/10 Ver.3 Page 8 SP6850 Green-Mode PWM Controller SOT-23-6L PACKAGE OUTLINE 2007/04/10 Ver.3 Page 9 SP6850 Green-Mode PWM Controller Information provided is alleged to be exact and consistent. SYNC Power Corporation presumes no responsibility for the penalties of use of such information or for any violation of patents or other rights of third parties that may result from its use. No license is granted by allegation or otherwise under any patent or patent rights of SYNC Power Corporation. Conditions mentioned in this publication are subject to change without notice. This publication surpasses and replaces all information previously supplied. SYNC Power Corporation products are not authorized for use as critical components in life support devices or systems without express written approval of SYNC Power Corporation. ©The SYNC Power logo is a registered trademark of SYNC Power Corporation ©2004 SYNC Power Corporation – Printed in Taiwan – All Rights Reserved SYNC Power Corporation 9F-5, No.3-2, Park Street NanKang District (NKSP), Taipei, Taiwan, 115, R.O.C Phone: 886-2-2655-8178 Fax: 886-2-2655-8468 http://www.syncpower.com 2007/04/10 Ver.3 Page 10