AR2003FV
ACTIVE/SYNCHRONOUS RECTIFICATION CONTROLLER
Description
Pin Assignments
The AR2003FV is Active/Synchronous Rectification Controller,
providing output voltage from 4.5V to 21V. Using internal drain-tosource voltage sensing, the AR2003FV is ideal for Fly-back, LLCresonant and other power supply architectures. It has SFB pin that
can eliminate the external feedback resistor when target output
voltage is 5V or 12V.
(Top View)
TON
2
The small footprint of the AR2003FV makes it ideal for space
constrained applications.
AGND 3
14 VCC
TOFF/EN 4
13 GND
VD
SFB 5
11 SYNC
10 GATE
NC 7
8
VS
Applications
USB PD Adaptor
AC-DC Battery Charger
Fly-back Conversion
PC Power Supply
SMPS
Power Adaptors
Auxiliary Power Supplies
PoE Power Devices
Notes:
9
VD
V-DFN3535-14
Features
12 DGATE
OVS 6
Intelligent features of this IC are the Minimum Off Time (TOFF) and
Minimum on Time (TON), these features blank the noise generated
during the turn on and turn off instances of the power FET. Light load
detection for improved efficiency at light and no load is implemented.
Other features include Under Voltage Lock Out (UVLO), SYNC
feature for CCM operation and low turn off threshold voltage for
improved efficiency.
Primary-Side
or
Secondary-side
Active/Synchronous
Rectification, Optimized for Systems with Dynamic Voltage
Scaling Capabilities
Frequency of Operation up to 600kHz
Suitable for Discontinuous (DCM), Continuous (CCM) and
Critical (CrCM) Conduction Mode
Minimum On-time and Off-time to Blanking Turn-on/off
Oscillations
Light Load Detection and Sleep Mode
Drain Voltage Rating of 200V
Recommended Operating Voltage from 4.5V up to 21V
Low Component Count.
Low Under Voltage Lockout
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
NC
1
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain 1V
–
30
50
ns
TDOFF
Gate Turn Off Propagation Delay
From VTHOFF to Gate < 4V
–
30
60
ns
TON-LR
Minimum On Time at Low Resistance
RTON = 8.25KΩ
0.26
0.34
0.42
µs
TON-HR
Minimum On Time at High Resistance
RTON = 100KΩ
2.25
3
3.75
µs
TOFF-LR
Minimum Off Time at Low Resistance
RTOFF = 100KΩ
0.8
1.4
2
µs
TOFF-HR
Minimum Off Time at High Resistance
RTOFF = 200KΩ
7.5
10
12.5
µs
TOFF-LV
Minimum Off Time at Low Voltage
VEN/TOFF=1V
0.8
1.4
2
µs
TOFF-HV
Minimum Off Time at High Voltage
VEN/TOFF=2V
7.5
10
12.5
µs
TOFF-OV
Minimum Off Time at Over Voltage
2V4.3V
-4
-6
40
VTHOFF - Voltage - mV
t SDLY - SYNC Propagation Delay Time -ns
50
TJ - Temperature - °C
Figure 6.
30
20
-8
-10
-12
-14
-16
VCC
0
<
-50
-100
-150
-200
-1
0
1
2
3
4
5
6
VD - Drain Sense Voltage - V
Figure 15.
AR2003FV
Document number: DS37473 Rev. 3 - 2
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AR2003FV
Modes of Operation
General Description
AR2003FV is an Active/Synchronous Rectifier which can work with many different primary side controllers. AR2003FV can be used in both SSR
and PSR systems.
AR2003FV has preset of internal feedback resistor that can reduce external BOM for 5V or 12V system.
UVLO MODE
When VCC does not reach UVLOTH, or falls blow UVLOTH - UVLOHYS, AR2003FV will be in UVLO MODE.
In this mode, AR2003FV will turn off external MOSFET, and TOFF/EN pin will internally short to GND. VCC current will be ICCSTART.
Sleep Mode
Sleep Mode is a low-power operating mode similar to UVLO Mode, except that this mode is entered by forcing V EN below the VEN-OFF threshold via
external control. Many internal circuits are turned off to reduce power consumption in this model to reduce device operating losses. External control
overrides any internal timing conditions, and immediately forces the GATE output low and enters Sleep Mode. VCC current is reduced to
ICCSTANDBY level. As VEN is restored to above the VEN-ON threshold, the device exits Sleep Mode into Light-Load Mode after a delay of several μs,
allowing re-powered internal circuits to settle.
Active Mode
This is the normal operation mode when inductor current is large enough and synchronous conduction time is longer than TON. AR MOSFET will be
turned on and off according to VD-VS, TON and TOFF setting and SYNC pin.
Light-Load Mode
When Inductor current is small and synchronous conduction time is less than TON, the AR MOSFET will be kept OFF to reduce switching power
loss. Voltage across body diode of AR MOSFET is continuously monitored. When the MOSFET body-diode conduction time is more than TON, the
device will be back to Active mode again.
Over Voltage Protection
Over Voltage mostly likely was an indication of optical coupler short. Therefore, just reporting output error information is not enough. AR2003FV will
drive an external FET to create a short situation so that primary side can be set to whole system to restart.
Over Temperature Protection (Only for Secondary-side Synchronous Rectification Application)
When AR2003FV is over heated, AR2003FV will light up the optical coupler to let the primary side deliver very little or no energy so that the whole
system will cool down. Hysteresis is set to +25°C.
Usually, VCC might drop blow UVLOTH - UVLOHYS (around 2.8V) due to system load. AR2003FV will enter UVLO mode, and system might restart
again. If AR2003FV is over heated again in short time, VCC might be kept around 2.8V. The primary side controller might treat this event as over
current or short current, and enters its protection mode.
Over Current Protection
Over Current Protection is not implemented in AR2003FV. Over Current Protection will be carried out in Primary side.
Short Current Protection
Short Current Protection is not implemented in AR2003FV. Short Current Protection handling will be carried out in Primary side.
AR2003FV
Document number: DS37473 Rev. 3 - 2
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AR2003FV
Application Information
ON Timer Programming
The Ton period (minimum on-time) is programmed by adding a resistor from TON pin to ground. In the application, it’s likely that when the MOSFET
is turned on there will be some ringing generated due to parasitic within the system. The minimum on time will stop the device reacting to this
ringing, by blanking out any signal received from the Drain to Source (VD-VS) comparator once the device is initially triggered. This will keep the
MOSFET turned on for duration of the minimum on-time, irrespective of the VD-VS voltage during this period.
If VD-VS reaches the gate turn-off threshold within the minimum on-time period, the device will change into Light Load Mode for the next switching
cycle. If the load conditions of the system change and the MOSFET turn-off threshold is once again reached once the minimum on-time is over, the
device reverts to its nominal mode of operation.
TON (μs) = 0.028μs * RTON (KΩ) + 0.1μs, 0.24μs < TON < 4.3μs, 5KΩ < RTON 70KΩ, VTOFF/EN
will over 1.4V (VEN-ON), AR2003FV will enter Active Mode. And the internal current source will switch to deliver 10µA (IEN-ON) to TOFF/EN pin. User
can program the minimum off-time by choosing proper value for RTOFF.
TOFF (µs) = 0.083µs* (RTOFF (KΩ)-81KΩ), valid for 85KΩ < RTOFF < 200KΩ
User can also program OFF timer by control the VTOFF/EN.
TOFF (µs) = 0.083µs* (VTOFF/EN-0.81V), valid for 0.85V < VTOFF/EN < 2V
The minimum off-time is the minimum time; the internal MOSFET will be turned off once VTHOFF turn off threshold is reached. This avoids the
MOSFET accidentally being retriggered by ringing after turn off.
No load mode VDS waveform
Maximum load mode VDS waveform
Minimum
on time
Minimum
off time
TFSW
VDS=VTHON =-150mV
Maximum
on time
VDS=VTHOFF
VDS=VTHON=-150mV
Minimum On Time
Maxima
off time
VDS=VTHARM=1.5V
>The time from VDS fall under VTHON to VDS ringing voltage <
VDS=VTHARM=1.5V
Check with no load waveform
VTHOFF
Maximum On Time
Minimum Off Time
< The time from VDS fall under VTHON to VDS =VTHOFF
> The time from VDS > VTHARM to VDS ringing negative voltage
Check with no load waveform
Check with no load waveform
higher than VTHON after turn off
Maximum Off Time
< The time from VDS=VTHARM to VDS drop from VCC level
AR2003FV
Document number: DS37473 Rev. 3 - 2
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Check with maximum load waveform
December 2014
© Diodes Incorporated
AR2003FV
Application Information (Cont.)
SYNC Input Circuit
SYNC pin is internally pulled up to internal AVDD (4.2V to 5V) through a 2KΩ resistor. If a falling edge of more than 2V is detected, the external
MOSFET will be turned off by AR2003FV. If the amplitude of SYNC signal is larger than 4.2V, an external resistor should be used to limit the input
current less than 2mA.
Ordering Information (Note 9)
Note 9:
Part Number
Marking
Reel size (inches)
Tape width (mm)
Quantity per reel
AR2003FV-13
AR2003
13
12
3,000
For packaging details, go to our website at http://www.diodes.com/products/packages.html.
Marking Information
AR2003
AR2003FV
Document number: DS37473 Rev. 3 - 2
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AR2003FV
Package Outline Dimensions (All dimensions in mm.)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version.
(1 ) Package Type: V-DFN3535-14
A1
A
A3
Seating Plane
D
e
(Pin #1 ID)
E
E2
e1
D2
L
b
Z
V-DFN3535-14
Dim
Min
Max
Typ
A
0.75
0.85 0.80
A1
0.00
0.05 0.02
A3
0.15
b
0.20
0.30 0.25
D
3.45
3.55 3.50
D2
1.90
2.10 2.00
E
3.45
3.55 3.50
E2
1.90
2.10 2.00
e
0.50
e1
1.50
L
0.35
0.45 0.40
Z
0.625
All Dimensions in mm
Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
(1 ) Package Type: V-DFN3535-14
X3
C
G1
Dimensions
X1
Y1
X2
C1
Y3
Y2
G
Y
C
C1
G
G1
X
X1
X2
X3
Y
Y1
Y2
Y3
Value
(in mm)
0.500
1.500
0.250
0.250
0.350
0.600
2.100
2.350
0.600
0.350
2.100
3.800
X
AR2003FV
Document number: DS37473 Rev. 3 - 2
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AR2003FV
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Copyright © 2014, Diodes Incorporated
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