SP6850AD8TG - SYNC Power Corporation

2007/04/10 Ver.3 Page 1

SP6850

Green-Mode PWM Controller

DESCRIPTION APPLICATIONS

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.

z AC/DC Switching Power Adaptor

z Battery Charger

z PC 5V Standby Power.

z Open-Frame Switching Power Supply

FEATURES PIN CONFIGURATION

SOT-23-6L DIP-8P

PART MARKING

SOT-23-6L DIP-8P

z High-Voltage BiCMOS Process

z Very Low Startup Current (Typ ~ 8µA)

z Under Voltage Lockout (UVLO )

z Current Mode Control with Cycle Peak

z Current Limiting

z Leading-Edge Blanking

z Programmable Switching Frequency

z Internal Slope Compensation

z Green-Mode Control for Power Saving

z Non-audible-noise Green Mode Control

z 300mA Driving Capability

z OVP (Over Voltage Protection) on Vcc Pin

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SP6850

Green-Mode PWM Controller

TYPICAL APPLCA TION CIRCUIT

TYPICAL APPLCATION CIRCUIT ( High Efficiency SMPS + Synchronous Rectifier )

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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

4 CS

Current sense. This pin senses the voltage across a resistor, to control PWM output. This pin

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

7 COMP

Voltage feedback. The pin provides the output voltage regulation signal., it provides feedback

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

2 COMP

Voltage feedback. The pin provides the output voltage regulation signal., it provides feedback

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.

4 CS

Current sense. This pin senses the voltage across a resistor, to control PWM output. This pin

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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SP6850

Green-Mode PWM Controller

ORDERING INFORMATION

Part Number Package Part Marking

SP6850AD8TG DIP-8P SP6850I

SP6850BD8TG DIP-8P SP6850I

SP6850AS26RG SOT-23-6L 85AYW

SP6850BS26RG SOT-23-6L 850YW

※ 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 Parameter Value Unit

VCC DC Supply Voltage 36 V

VCOMP / RT / CS COMP / RT / CS Voltage -0.3 ~ 7.0 V

PD Power Dissipation @ TA=85 (*)℃ 0.3 W

Human Body Model 4 KV

ESD Machine Model 300 V

Tope Operating Ambient Temperature -40 ~ 85 ℃

TJ Operating Junction Temperature Range -40 ~ 150 ℃

TSTG Storage Temperature Range -40 ~ 150 ℃

TLEAD Pb-Free Lead Soldering Temperature for 5 sec. 260 ℃

SOT-23-6L 210

RӨJC Thermal Resistance Junction – Case (*) DIP-8P 95 /W℃

(*) The power dissipation and thermal resistance are evaluated under copper board mounted with free air conditions.

2007/04/10 Ver.3 Page 5

SP6850

Green-Mode PWM Controller

ELECTRICAL CHARACTERISTICS

(TA=25 , V℃CC=15V, unless otherwise specified.)

Symbol Parameter Conditions Min. Typ. Max. Unit

Supply Voltage ( Vcc Pin )

Istt Startup Current 8 20 uA

Iop Operating Current VCOMP = 3V 2 4 mA

UVLO (off) Min. Operating Voltage 9.0 10.0 11.0 V

UVLO (on ) Start Threshold Voltage 15.0 16.0 17.0 V

OVP Level Over Voltage Protection 28 36 V

Voltage Feedback ( Comp Pin )

Isc Short Circuit Current 2.2 3.0 mA

Vop Open Loop Voltage 5.0 V

VTH(GM) Green Mode Threshold VCOMP 2.35 V

Oscillator ( RT Pin )

FOSC Frequency RT=100KΩ 60.0 65.0 75.0 KHz

FOSC(GM) Green Mode Frequency Fs=65.0KHz 20 KHz

Fdt Frequency Variation versus Temp. Deviation (-40°C ~105°C) 3 %

Fdv Frequency Variation versus VCC Deviation (VCC=11V-25V) 1 %

Current Sensing ( CS Pin )

SP6850BD8TG

SP6850BS26RG 0.8 0.85 0.9

Vcs(off) Maximum Input Voltage SP6850AD8TG

SP6850AS26RG 0.7 0.75 0.8

V

Zcs Input impedance 50 KΩ

TPD Delay to Output 150 nS

Gate Driver Output ( OUT Pin )

DC (Max) Maximum Duty Cycle 70 75 80 %

DC (Min) Minimum Duty Cycle 0 %

VOL Output Low Level VCC=15V,

Io=20mA 1 V

VOH Output High Level VCC=15V,

Io=20mA 8 V

Tr Rising Time Load Cap=1000pF 50 200 nS

Tf Falling Time Load Cap=1000pF 30 120 nS

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SP6850

Green-Mode PWM Controller

PERFORMANCE CHARACTERIS TICS (TA=25 , unless otherwis℃e specified.)

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SP6850

Green-Mode PWM Controller

PERFORMANCE CHARACTERIS TICS (TA=25 , unless otherwise specified.)℃

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SP6850

Green-Mode PWM Controller

DIP- 8P PACKAGE OUTLINE

2007/04/10 Ver.3 Page 9

SP6850

Green-Mode PWM Controller

SOT-23-6L PACKAGE OUTLINE

2007/04/10 Ver.3 Page 10

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.

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