SP6018
Synchronous Rectifier Driver
DESCRIPTION
The fundamental of SP6018 synchronous
rectifier (SR) driver IC is based on our U.S.
patented methods that utilize the principle of
“prediction”
logic
circuit.
The
IC
deliberatesprevious cycle timing to control the SR
in present cycle by “predictive” algorithm that
makes adjustments to the turn-off time, in order to
achieve maximum efficiency and avoid
cross-conduction at the same time. Specially,
SP6018 is designed for Resonance. It also
maintains the MOSFET’s body diode conduction at
minimum level. The SP6018 is capable to adapt in
almost all existing adaptors with few adjustments
considered necessary.
FEATURES
•
Offers efficiency improvement over Schottky
Diode (depends on drive configuration of the
SR).
•
•
•
•
•
Drives all Power MOSFET.
Prediction gate timing control.
Minimum MOSFET body diode conduction.
Operating frequency up to 400 KHz.
Synchronize to transformer
voltage waveform.
secondary
PART MARKING
APPLICATIONS
•
Servers & workstations
•
•
•
•
Storage area network power supplies
Telecommunication converters
Embedded systems
Industrial & commercial systems using high
current processors
PIN CONFIGURATION (SOP-8)
2009/11/04
Ver.2
Page 1
SP6018
Synchronous Rectifier Driver
TYPICAL APPLCATION CIRCUIT
PIN DESCRIPTION
Pin
1
2
3
4
5
6
7
8
Symbol
Timing
Pred
VR
Adj
GND
MOSG-C
Vdd
SYNC
Description
Discontinuous current filter timing adjustment resistor connection.
Capacitor to store previous cycle timing for SR MOSFET.
Voltage Regulator.
Trigger point adjustment for Dynamic state.
Ground connection.
Catch MOSFET gate drive.
DC supply voltage.
Synchronized signal from the V
DS
of SR MOSFET.
2009/11/04
Ver.2
Page 2
SP6018
Synchronous Rectifier Driver
BLOCK DIAGRAM
ORDERING INFORMATION
Part Number
Package
Part Marking
SP6018I
SP6018I
SP6018S8RGB
SOP-8
SP6018S8TGB
SOP-8
※
SP6018S8RGB : 7” Tape Reel ; Pb – Free ; Halgon – Free
※
SP6018S8TGB : Tube ; Pb – Free ; Halgon – Free
ABSOULTE MAXIMUM RATINGS
(TA=25
℃
, unless otherwise specified.)
The following ratings designate persistent limits beyond which damage to the device may occur
.
Symbol
V
dd
I
OUT
P
D
T
J
T
STG
T
LEAD
Parameter
DC Supply Voltage
Peak Source Current (Pulsed)
Peak Sink Current (Pulsed)
Power Dissipation @ T
A
=85
℃
(*)
Operating Junction Temperature Range
Storage Temperature Range
Lead Soldering Temperature for 5 sec.
Value
16
1
1
0.25
-40 to125
-40 to 150
260
Unit
V
A
A
W
℃
℃
℃
2009/11/04
Ver.2
Page 3
SP6018
Synchronous Rectifier Driver
THERMAL RESISTANCE
Symbol
R
ӨJC
Parameter
Thermal Resistance Junction – Case (*)
Value
45
Unit
℃
/W
(*) The power dissipation and thermal resistance are evaluated under copper board mounted with free air conditions.
ELECTRICAL CHARACTERISTICS
(T
A
=25
℃
, V
dd
=12V, Freq. =300 KHz, Duty Cycle=50%, unless otherwise specified.)
Symbol
SUPPLY INPUT
I
DD
Parameter
Supply current
Conditions
No load
V
SYNC
=0V, No load
Idd
peak
< 2A
Min.
Typ.
4
5
Max.
7
8
16
11.0
Unit
mA
mA
V
V
V
V
V
mA
mA
us
V
V
ns
ns
ns
ns
ns
us
Vdd
Supply voltage
Vdd on
Enable voltage
SYNC REFERENCE
(SYNC)
Vshth
SYNC high threshold
Vslth
SYNC low threshold
Vsync
SYNC clamp voltage
Isync
SYNC input current
Voltage Regulator REFERENCE
(VR)
I
VR
VR Output Current
ON TIME DUTY SETUP
( PIN 6 )
T
on-time
MOSFET GATE DRIVER
(MOSG-C)
Voh
Output high voltage
Vol
Output low voltage
Td
Propagation delay
Tpred
Tr
Rise time
Tf
Fall time
Dynamic Protect
Dt
Dynamic variable
Ton-min MOSG-C on time
9.0
10.0
3.9
0.9
5
Isync=3mA
3
20
20
Io
= -200mA
Io
= 200mA
No load
No load
No load
No load
Pin 4 open
PWM adjusts time > Dt
10.5
50
11
0.5
80
120
10
10
600
1
0.8
25
25
(*) Tr & Tf are measured among 10% and 90% of starting and final voltage.
2009/11/04
Ver.2
Page 4
SP6018
Synchronous Rectifier Driver
PERFORMANCE CHARACTERISTICS
(T
A
=25
℃
, unless otherwise specified.)
*Fig. 1 : No Load ; No SYNC
*Fig. 4~5 : Frequency = 100 kHz.
2009/11/04
Ver.2
Page 5
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