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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 ~ 8A) 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
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SP6850
Green-Mode PWM Controller
TYPICAL APPLCATION CIRCUIT
TYPICAL APPLCATION CIRCUIT ( High Efficiency SMPS + Synchronous Rectifier )
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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
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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.)
The following ratings designate persistent limits beyond which damage to the device may occur.
Symbol VCC VCOMP / RT / CS PD ESD Tope TJ TSTG TLEAD RJC
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
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.
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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=100K Fs=65.0KHz (-40C ~105C) (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 K 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
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SP6850
Green-Mode PWM Controller
PERFORMANCE CHARACTERISTICS (TA=25, unless otherwise specified.)
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SP6850
Green-Mode PWM Controller
PERFORMANCE CHARACTERISTICS (TA=25, unless otherwise specified.)
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SP6850
Green-Mode PWM Controller
DIP- 8P PACKAGE OUTLINE
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Green-Mode PWM Controller
SOT-23-6L PACKAGE OUTLINE
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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. (c)The SYNC Power logo is a registered trademark of SYNC Power Corporation (c)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
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