SYNC-POWER SP6851D8TG

SP6851
Green-Mode Power Switch
DESCRIPTION
The SP6851 is a low cost, low startup current, current
mode PWM controller with green-mode
power-saving operation. Built-in 650V MOSFET
provides simple design for adapter. The integrated
functions include the leading-edge blanking of the
current sensing, internal slope compensation. It
would provide the users a superior AC/DC power
application of higher efficiency, low external
component counts, and lower cost solution for
applications.
The SP6851 features more protections or functions
for the following characteristics :
※Add OLP (Over Load Protection) function to
provide better protection performance for fault
conditions like short circuit or over load.
※Modify the OVP (Over Voltage Protection)
mechanism from the cycle-by-cycle mode to the
hiccup mode.
SP6851 is available in DIP-8P package.
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 (<20µA)
Under Voltage Lockout (UVLO )
Current Mode Control
Non-audible-noise Green Mode Control
Current Limiting
OLP (Over Load Protection)
OVP (Over Voltage Protection) on Vcc Pin
Leading-Edge Blanking
Programmable Switching Frequency
Internal Slope Compensation
Green-Mode Control for Power Saving
PIN CONFIGURATION
Building in 650V MOSFET
DIP-8P
PART MARKING
DIP-8P
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SP6851
Green-Mode Power Switch
TYPICAL APPLCATION CIRCUIT
TYPICAL APPLCATION CIRCUIT for HIGH EFFICIENCY SMPS
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SP6851
Green-Mode Power Switch
PIN DESCRIPTION
Pin
1
2
3
4
5
6
7
8
Symbol
Description
Source Power MOSFET Source
Current sense. This pin senses the voltage across a resistor, to control PWM output. This pin
CS
also provides current amplitude information for current-mode control.
GND Ground
RT
This current is used to charge an internal capacitor, to determine the switching frequency.
Voltage feedback. The pin provides the output voltage regulation signal, it provides feedback
COMP
to the internal PWM comparator, so that the PWM comparator can control the duty cycle.
VCC Supply Voltage in
Drain Power MOSFET Drain
Drain Power MOSFET Drain
BLOCK DIAGRAM
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SP6851
Green-Mode Power Switch
ORDERING INFORMATION
Part Number
SP6851D8TG
SP6851D8TGB
※ SP6851D8TG : Tube ; Pb – Free
Package
Part Marking
DIP-8P
DIP-8P
SP6851I
SP6851I
※ SP6851D8TGB : Tube ; Pb – Free ; Halogen – 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
EAS
Tope
TJ
TSTG
Parameter
DC Supply Voltage
COMP / RT / CS Voltage
MOSFET Breakdown Voltage
Power Dissipation @ TA=85℃ (*)
Human Body Model
Machine Model
Single Pulse Avalanche Energy
Operating Ambient Temperature
Operating Junction Temperature Range
Storage Temperature Range
Value
36
-0.3 ~ 7.0
650
0.3
4
300
49
-40 ~ 85
-40 ~ 150
-40 ~ 150
Unit
V
V
V
W
KV
V
mJ
℃
℃
℃
RӨJC
Thermal Resistance Junction – Case (*)
95
℃/W
VCOMP / RT / CS
VDS
PD
ESD
(*) The power dissipation and thermal resistance are evaluated under copper board mounted with free air conditions.
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SP6851
Green-Mode Power Switch
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
Leading Edge Blanking Time
TLEDD
Zcs
Input impedance
TPD
Delay to Output
MOSFET
DC (Max) Maximum Duty Cycle
DC (Min) Minimum Duty Cycle
VDSS
Drain-Source Breakdown Voltage
IDSS
Drain-Source Leakage Current
RDS(ON) On-State Resistance
VSD
Forward On Voltage
Co
Output capacitance
Tr
Rising Time
Tf
Falling Time
OLP ( Over Load Protection )
OLP Trip Level
TLOLP
TDOLP OLP Delay Time (note)
Conditions
Min.
VCOMP = 0V
VCOMP = 3V
Protection
(OLP, OVP)
tripped
Max.
Unit
10
2.7
2.4
20
4
uA
mA
mA
1.0
9.0
15.0
26
RT=100KΩ
Fs=65.0KHz
(-40°C ~105°C)
(VCC=11V-22V)
Typ.
60.0
mA
10.0
16.0
27
11.0
17.0
29.5
V
V
V
1.25
6
2.35
2.2
mA
V
V
68.0
22
70.0
KHz
KHz
%
%
3
1
0.8
0.85
280
0.9
V
nS
MΩ
nS
80
%
%
V
uA
Ω
V
1
100
70
VGS=0V, ID=250uA
VGS=0V, VDS=550V
VGS=10V, ID=1A
VGS=0V, IS=1.4A
VGS=0V, VDS=25V,
f=1.0MHz
75
0
650
10
4.95
1.5
27
50
30
5.0
60
pF
200
120
nS
nS
V
mS
Note: The OLP delay time is proportional to the period of switching cycle. So that, the lower RT value will set the higher
switching frequency and the shorter OLP delay time.
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SP6851
Green-Mode Power Switch
PERFORMANCE CHARACTERISTICS (TA=25℃, unless otherwise specified.)
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SP6851
Green-Mode Power Switch
PERFORMANCE CHARACTERISTICS (TA=25℃, unless otherwise specified.)
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SP6851
Green-Mode Power Switch
PERFORMANCE CHARACTERISTICS (TA=25℃, unless otherwise specified.)
Max Duty Cycle
Max Duty Cycle
Max Duty Cycle
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Min Duty Cycle
Min Duty Cycle
Min Duty Cycle
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SP6851
Green-Mode Power Switch
PERFORMANCE CHARACTERISTICS (TA=25℃, unless otherwise specified.)
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Rising Time Load
Falling Time Load
Rising Time Load
Falling Time Load
Rising Time Load
Falling Time Load
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SP6851
Green-Mode Power Switch
PERFORMANCE CHARACTERISTICS (TA=25℃, unless otherwise specified.)
Leading Edge Blanking Time
Leading Edge Blanking Time
Leading Edge Blanking Time
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OLP Delay Time
OLP Delay Time
OLP Delay Time
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SP6851
Green-Mode Power Switch
DIP- 8P PACKAGE OUTLINE
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SP6851
Green-Mode Power Switch
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
7F-2, No.3-1, 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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