GR8387KG [GRENERGY]
Secondary Side Synchronous Rectifier Controller;
| 型号： | GR8387KG |
| 厂家： | 
Grenergy Opto, lnc. |
| 描述： | Secondary Side Synchronous Rectifier Controller |
| 文件： | 总11页 (文件大小：601K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
GR8387
Secondary Side Synchronous Rectifier Controller
Features
Description
GR8387 is the synchronous rectifier controller
used in discontinuous conduction mode and
quasi-resonant flyback converters. The IC controls
N-MOSFET to substitute Schottky diode. The VD
to VS voltage difference is sensed to decide the
polarity of the current and turn the power switch
on/off in nearly of zero current transition. When
light load the gate driver output can be disable to
avoid long MOSFET turn on period.
High speed secondary synchronous rectifier
High system efficiency from no load to full load
Light load protection function
DCM topology
200V high voltage technology
Ultra low startup and quiescent current
Vcc ranges from 11.6V to 19.5V
SOP-8 green (Halogen free) package
Applications
ATX power supply
NB adapter
LCD TV
SMPS
Ordering and Marking Information
SOP-8
Grenergy OPTO Inc. reserves the right to make changes to improve reliability or manufacture ability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
1
GR8387
Pin Configuration
Top View
1
2
3
4
8
7
6
5
VCC
OVA
MOT
EN
OUT
GND
VS
VD
Pin Descriptions
Pin No.
Name
VCC
OVA
MOT
EN
Function
1
2
3
4
5
6
7
8
Supply voltage
Offset voltage altering
Minimum on time setting
Enable (Internal pull high)
VD
MOSFET drain voltage sensing
MOSFET source voltage sensing
Ground
VS
GND
OUT
Gate drive output
Absolute Maximum Ratings
VCC, EN, VS, OUT ------------------------------------------------------------------------------------------------ - 0.3V ~ 20V
VD (Continued and pulsed) --------------------------------------------------------------------------------------- -3V ~ 180V
Operating junction temperature ------------------------------------------------------------------------------ -40 ~ 150
Storage temperature -------------------------------------------------------------------------------------------- -55 ~ 150
SOP-8 package thermal resistance -------------------------------------------------------------------------------
Power dissipation (SOP-8, at ambient temperature = 85 --------------------------------------------------- 400mW
ESD protection (Human body mode) ------------------------------------------------------------------------------------- 2KV
160 /W
)
ESD protection (Machine Mode) ------------------------------------------------------------------------------------------- 200V
Switching frequency ------------------------------------------------------------------------------------------------------- 500KHz
2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8387
Block Diagram
2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8387
Electrical Characteristics (VCC = 15V, Ta = 25 , unless otherwise specified)
Parameter
Conditions
Symbol
Min. Typ. Max. Unit
SUPPLY SECTION
Supply voltage operating range
VCC turn on threshold
VCC turn off threshold
VCC turn on/off hysteresis
VCC
11.6
9.7
8.4
1.4
19.5
11.2
9.6
V
V
V
V
VCC ON
10.5
9
VCC UVLO
VCC HYST
1.57
1.7
CLOAD =1nF, fsw = 500kHz
CLOAD = 10nF, fsw = 500kHz
9
13
mA
Operating current
ICC
57
1.5
90
69
2.2
140
200
mA
mA
µA
µA
V
Quiescent current
IQCC
ICC START
ISLEEP
VENHI
Start-up current
VCC = VCC ON - 0.1V
VEN = 0V, VCC = 15V
Sleep current
160
2.71
1.6
1.5
Enable voltage high
Enable voltage low
Enable pull-up resistance
COMPARATOR SECTION
VENLO
REN
V
MΩ
OVT = 0V, VS = 0V
OVT floating, VS = 0V
OVT = VCC, VS = 0V
-7.5
-15
-4
0
-7.5
-15
-50
7.5
100
2
Turn-off threshold
VTH1
mV
-11
-24
-19.5
Turn-on threshold
VTH2
IIBIAS1
IIBIAS2
VOFFSET
VCM
-150
mV
µA
µA
mV
V
Input bias current
1
Input bias current
VD = 200V
23
Comparator input offset
Input CM voltage range
NOISE REJECT SECTION
-0.15
2
RMOT = 5kΩ, VCC = 12V
RMOT = 75kΩ, VCC = 12V
VCC = 10V - GBD
240
2.8
290
3.5
2.5
5.4
40
350
4.2
ns
µs
V
Minimum on time
TONmin
Reset threshold VTH3
Hysteresis
VTH3
VCC = 20V - GBD
V
VCC = 10V - GBD
VHYST3
mV
2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
4
GR8387
Electrical Characteristics (Cont.)
Parameter
GATE DRIVER SECTION
Gate low voltage
Conditions
Symbol
Min.
Typ.
Max.
Unit
IGATE = 200mA
VGLO
VGTH
0.2
11
0.5
V
V
VCC = 12V-18V (internally
clamped)
Gate high voltage
Rise time
9.5
12.5
CLOAD = 1nF, VCC = 12V
CLOAD = 10nF, VCC = 12V
CLOAD = 1nF, VCC = 12V
CLOAD = 10nF, VCC = 12V
VDS to VGATE -100mV
overdrive
tr1
tr2
tf1
tf2
20
270
8.5
42
ns
ns
ns
ns
Fall time
Turn on propagation delay
Turn off propagation delay
tDon
tDoff
130
90
160
110
ns
ns
VDS to VGATE -100mV
overdrive
Pull up resistance
IGATE = 1A - GBD
IGATE = -200mA
rup
rdown
IO
5
Ω
Ω
Pull down resistance
1.7
Output peak current (source)
Output peak current (sink)
CLOAD = 10nF - GBD
CLOAD = 10nF - GBD
1
4
A
A
source
IO sink
2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8387
Typical Application Circuit
1. Low side rectification
2. High side rectification
2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
6
GR8387
Application Information
Overview
GR8387, the secondary side driver IC, emulates the
operation of diode rectifier by driving a synchronous
rectifier MOSFET. Using low RDS_ON N-MOSFET to
substitute Schottky diode, the lower turn-on voltage
will reduce conduction loss on rectifier. The
efficiency of power converter will be boosted.
makes OUT pin be pulled low and turns the
MOSFET off.
Minimum On time (MOT) and Turn Off Latch
To avoid the mistrigger which is caused by noise as
MOSFET is switching, minimum on time (MOT)
function and turn off latch control have been built in
GR8387. When OUT pin is pulled high, the
minimum on time (MOT) which is setting by the
resistor between MOT pin to ground keeps the
MOSFET on. As OUT pin is pulled low, the
MOSFET won’t open again until the VDS over reset
threshold Voltage (VTH3), which means that the
secondary side discharge has finished.
Under-Voltage Lockout (UVLO)
The GR8387 remains off until VCC voltage exceeds
VCC turn-on threshold voltage (VCC_ON). As the
IC is off, it takes as little current as 75uA. Once the
VCC rises above VCC_ON, the IC starts to work. It
continues to operate until the voltage drops below
VCC turn-off threshold voltage (VCC_OFF).
Sleeping / Normal Mode
Since the GR8387 Vcc pin voltage exceeds
VCC_ON, there are two modes available, sleeping
mode and normal mode. The IC will be in sleeping
mode as EN pin is pulled low. In this mode, the IC
draws a very low quiescent supply current and
MOSFET goes into off state. As EN pin is pulled
high, the IC will be in normal mode. In this mode,
MOSFET starts to switch, and the IC needs higher
supply current to support function blocks working.
OUT Pin Turn on/off Phase
As secondary side rectifier is in conduction state,
(Fig.1, T2) the rectifier current flows through the
body diode of the MOSFET at first, which will
generate a negative VDS voltage on the MOSFET.
The negative voltage will be below turn-on threshold
voltage (VTH2), and then the GR8387 OUT will be
pulled high to drive the MOSFET turn on. The
current will flow through the channel of the MOSFET
and causes the VDS voltage to drop down.
When the MOSFET is turned on, it stays on until the
rectifier current reduces to the level while VDS
exceeds the turn-off threshold voltage (VTH1). This
2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
7
GR8387
Fig 1. Secondary Side Operation
Fig 2. Normal Mode Operation (EN=H)
Fig 3. Sleeping Mode Operation (EN=L)
2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8387
Typical Performance Characteristics
Fig 4. VCC_ON vs. Temp.
Fig 5. VCC UVLO vs. Temp.
Fig 6. VCC HYST vs. Temp.
Fig 7. TONmin vs. Temp.
Fig 8. VTH1 vs. Temp.
2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
9
GR8387
Package Information
SOP-8
SYMBOL
INCHES
MILLIMETERS
MIN.
MAX.
1.75
0.25
MIN.
MAX.
0.069
0.010
A
A1
A2
b
0.10
1.25
0.31
0.17
4.80
5.80
3.80
0.004
0.049
0.012
0.007
0.189
0.228
0.150
0.51
0.25
5.00
6.20
4.00
0.020
0.010
0.197
0.244
0.157
c
D
E
E1
e
1.27 BSC
0.050 BSC
h
0.25
0.40
0o
0.50
1.27
8o
0.010
0.016
0o
0.020
0.050
8o
L
Note: 1. Followed from JEDEC MS-012 AA.
2. Dimension “D” does not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate
burrs shall not exceed 6 mil per side.
3. Dimension “E1” does not include inter-lead flash or protrusions. Inter-lead flash and protrusions shall
not exceed 10 mil per side.
2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8387
Carrier Tape & Reel Dimensions
SOP- 8
Application
SOP-8
A
H
50 MIN.
P1
T1
C
d
D
W
E1
F
12.4+2.00 13.0+0.50
-0.00 -0.20
330.0 2.0
1.5 MIN. 20.2 MIN. 12.0 0.30 1.75 0.10 5.5 0.05
P0
P2
D0
D1
T
A0
B0
K0
1.5+0.10
-0.00
0.6+0.00
-0.40
4.0 0.10
8.0 0.10 2.0 0.05
1.5 MIN.
6.40 0.20 5.20 0.20 2.10 0.20
(mm)
Devices Per Unit
Application
SOP- 8
Carrier Width
Cover Tape Width
Devices Per Reel
12
-
2500
________________________________________________________________________
Grenergy OPTO, Inc. reserves the right to make corrections, modifications, enhancements, improvements, and other changes
to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the
latest relevant information before placing orders and should verify that such information is current and complete.
2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
11
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