APR343KTR-G1 [DIODES]
Switching Controller;
| 型号： | APR343KTR-G1 |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | Switching Controller 开关 |
| 文件： | 总12页 (文件大小：420K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A Product Line of
Diodes Incorporated
APR343
SECONDARY SIDE SYNCHRONOUS RECTIFICATION CONTROLLER
Description
Pin Assignments
APR343 is a secondary side MOSFET driver for synchronous
rectification in DCM operation, which integrates the output voltage
detection function for primary side control system.
(Top View)
The synchronous rectification can effectively reduce the secondary
side rectifier power dissipation and provide high performance solution.
By sensing MOSFET drain-to-source voltage, APR343 can output
ideal drive signal with less external components. It can provide high
performance solution for 5V output voltage application.
1
2
3
5
4
DRISR
GND
VDET
AREF
Same as AP4341, APR343 detects the output voltage and provides a
periodical signal when the output voltage is lower than a certain
threshold. By fast response to secondary side voltage, APR343 can
effectively improve the transient performance of primary side control
system.
VCC
SOT25
The APR343 is available in SOT25 package.
Applications
Features
Adapters/Chargers for Cell/Cordless Phones, ADSL Modems,
MP3 and Other Portable Apparatus
Standby and Auxiliary Power Supplies
Synchronous Rectification for DCM Operation Flyback
Eliminate Resonant Ring Interference
Fast Detector of Supply Voltage
Fewest External Components
Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
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 <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
T1
+
C20
Q2
C22
R21
5
1
3
R22
VDET
DRISR VCC
APR343
C21
AREF
GND
4
2
R20
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December 2014
© Diodes Incorporated
APR343
Document number: DS36884 Rev. 4 - 2
A Product Line of
Diodes Incorporated
APR343
Pin Descriptions
Pin Number
Pin Name
Function
1
2
3
DRISR
GND
Synchronous rectification MOSFET Gate drive
Ground
VCC
Power supply, connected with system output
Program a voltage reference with a resistor from AREF to GND, to enable synchronous rectification
MOSFET drive signal
4
5
AREF
VDET
Synchronous rectification sense input and dynamic function output, connected with secondary winding
Functional Block Diagram
VCC
3
VREF
IOVP
Integrator
( VDET -VCC )* tONP
Dynamic
OVP
IAREF
Counter
tONPDET
4
OSC
AREF
1
SRDRIVER
DRISR
2
GND
5
VDET
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December 2014
© Diodes Incorporated
APR343
Document number: DS36884 Rev. 4 - 2
A Product Line of
Diodes Incorporated
APR343
Absolute Maximum Ratings (Note 4)
Symbol
Parameter
Rating
-0.3 to 7.5
-2 to 50
-0.3 to 6
Internally limited
0.6
Unit
V
VCC
Supply Voltage
VDET
Voltage at VDET Pin
V
VAREF, VDRISR
Voltage at AREF, DRISR Pin
Output Current at VDET
Power Dissipation at TA = +25ºC
Operating Junction Temperature
Storage Temperature
V
–
PD
TJ
A
W
+150
ºC
TSTG
–
-65 to +150
+300
ºC
Lead Temperature (Soldering, 10 sec)
ºC
Thermal Resistance (Junction to Ambient)
θJA
θJC
197
ºC /W
ºC /W
Thermal Resistance (Junction to Case)
76
Note 4: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Symbol
VCC
Parameter
Min
0
Max
6
Unit
V
Supply Voltage
Ambient Temperature
TA
-40
+85
ºC
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December 2014
© Diodes Incorporated
APR343
Document number: DS36884 Rev. 4 - 2
A Product Line of
Diodes Incorporated
APR343
Electrical Characteristics (@VCC = 5V, TA = +25C, unless otherwise specified.)
Symbol
Parameters
Conditions
Min
Typ
Max
Unit
Supply Voltage ( VCC Pin )
ISTARTUP
IOP
Startup Current
Operating Current
VCC = VSTARTUP-0.1V
–
100
100
150
150
µA
µA
VDET pin floating
40
VCC = VTRIGGER+20mV
VSTARTUP
Startup Voltage
UVLO
–
–
2.6
2.3
3.1
2.8
3.4
3.1
V
V
–
Dynamic Output Section/Oscillator Section
VTRIGGER
Internal Trigger Voltage
Duty Cycle
–
5.25
4
5.3
8
5.35
12
V
%
µs
–
–
tOSC
Oscillation Period
VCC = 5V
18
30
37.5
VCC = VTRIGGER, VCC/VDET pin
is separately connected to a 20Ω
resistor
ITRIGGER
Internal Trigger Current
30
–
42
mA
tDIS
VDIS
Minimum Period
–
18
5.28
1.5
30
30
5.44
3
37.5
5.52
4.5
–
ms
V
Discharge Voltage
–
IDIS
Discharge Current
VCC = VDIS+0.1V
mA
mV
V
VDIS-VTRIGGER
VOVP
Trigger Discharger Gap
Overshoot Voltage for Discharge
–
–
110
5.9
5.8
6.0
VCC = VOVP+0.1V, VCC pin is
IOVP
Overshoot Current for Discharge
40
–
100
mA
connected to a 20Ω resistor
Synchronous Rectification Detection and Drive
VTHON
VTHOFF
tDON
Gate Turn On Threshold
Gate Turn Off Threshold
Turn On Delay Time
–
0
-20
–
–
-12.5
70
1
V
mV
ns
ns
ns
ns
–
-5
From VTHON to VDRISR = 1V
From VTHOFF to VDRISR = 3V
From 1V to 3V, CL = 4.7nF
From 3V to 1V, CL = 4.7nF
(VDET-VCC)*tONP = 25Vµs
(VDET-VCC)*tONP = 50Vµs
VCC = 5V
130
150
100
100
2.7
6.5
–
tDOFF
Turn Off Propagation Delay Time
Turn On Rising Time
–
100
50
tRG
–
tFG
Turn Off Falling Time
–
50
tLEB_S
0.9
–
1.8
–
Minimum On Time
µs
tLEB_L
VDRISR_HIGH
Drive Output Voltage
3.7
–
V
V
Synchronous Rectification (SR)
VS_MIN
–
–
–
4.5
Minimum Operating Voltage (Note 5)
tOVP_LAST
Kqs
Added OVP Discharge Time
(Note 6)
–
–
2.0
–
ms
(VDET-VCC)*tONP = 25Vµs
0.325
–
0.625
mA*µs
Notes: 5. This item specifies the minimum SR operating voltage of VIN_DC, VIN_DC≥NPS*VS_MIN.
6. This item is used to specify the value of RAREF
.
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December 2014
© Diodes Incorporated
APR343
Document number: DS36884 Rev. 4 - 2
A Product Line of
Diodes Incorporated
APR343
Performance Characteristics
Startup Voltage vs. Temperature
UVLO vs. Temperature
3.5
3.0
2.5
2.0
1.5
1.0
3.50
3.25
3.00
2.75
2.50
2.25
2.00
-40
-20
0
20
40
60
80
100
120
140
-40
-20
0
20
40
60
80
100
120
140
Temperature (oC)
Temperature (oC)
Internal Trigger Voltage vs. Temperature
Internal Trigger Current vs. Temperature
80
5.4
5.3
5.2
5.1
5.0
4.9
4.8
4.7
70
60
50
40
30
20
10
0
-40
-20
0
20
40
60
80
100
120
140
-40
-20
0
20
40
60
80
100
120
140
Temperature (oC)
Temperature (oC)
Overshoot Voltage for Discharge vs. Temperature
Overshoot Current for Discharge vs. Temperature
160
6.0
5.8
5.6
5.4
5.2
5.0
140
120
100
80
60
40
20
0
-40
-20
0
20
40
60
80
100
120
140
-40
-20
0
20
40
60
80
100
120
140
Temperature (oC)
Temperature (oC)
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December 2014
© Diodes Incorporated
APR343
Document number: DS36884 Rev. 4 - 2
A Product Line of
Diodes Incorporated
APR343
Performance Characteristics (Cont.)
Gate Turn Off Threshold vs. Temperature
Kqs (See Note 6) vs. Temperature
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
-10
-20
-30
-40
-40
-20
0
20
40
60
80
100
120
140
-40
-20
0
20
40
60
80
100
120
140
Temperature (oC)
Temperature (oC)
Operating Current vs. Temperature
140
120
100
80
60
40
20
0
-40
-20
0
20
40
60
80
100
120
140
Temperature (oC)
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December 2014
© Diodes Incorporated
APR343
Document number: DS36884 Rev. 4 - 2
A Product Line of
Diodes Incorporated
APR343
Output Voltage Detection Function Description
tOSC
tOSC
tDIS
tDIS
tDIS
tDIS
tDIS
tDIS
VDET
VCC
VOVP
VDIS
VDIS
VTRIGGER
VTRIGGER
VOFF
VON
UVLO
tOVP_LAST
IOVP
IDIS
IVCC
Figure 1. Typical Waveforms 1 of APR343
When VCC is beyond power-on voltage (VON), the APR343 starts up. The VDET pin asserts a periodical pulse and the oscillation period is tOSC
.
When VCC is beyond the trigger voltage (VTRIGGER), the periodical pulse at VDET pin is discontinued. When VCC is beyond the discharge voltage
(VDIS), the discharge circuit will be enabled, and a 3mA current (IDIS) will flow into VCC pin. When VCC is higher than the overshoot voltage (VOVP),
the APR343 will enable a discharge circuit, the discharge current (IOVP) will last tOVP_LAST time. After the tOVP_LAST time, APR343 will stop the
discharge current and detect VCC voltage again. If VCC is still higher than VOVP, the tOVP_LAST time discharge current will be enabled again. Once the
OVP discharge current is asserted, the periodical pulse at VDET pin will be disabled.
When the VCC is below the power-off voltage (VOFF), the APR343 will be shut down.
MOSFET Driver Operation Description
I,V
VDET
IS
VTHON
0
t
VTHOFF
VDRISR
0.9VDRISR
0.9VDRISR
0.1VDRISR
tRG
0.1VDRISR
tFG
0
t
tDON
tDOFF
Figure 2. Typical Waveforms 2 of APR343
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December 2014
© Diodes Incorporated
APR343
Document number: DS36884 Rev. 4 - 2
A Product Line of
Diodes Incorporated
APR343
MOSFET Driver Operation Description (Cont.)
The operation of the SR is described with timing diagram shown in Figure 2. APR343 monitors the MOSFET drain-source voltage. When the drain
voltage is lower than the turn-on threshold voltage VTHON, the IC outputs a positive drive voltage after a turn-on delay time (tDON). The MOSFET will
turn on and the current will transfer from the body diode into the MOSFET’s channel.
In the process of drain current decreasing linearly toward zero, the drain-source voltage rises synchronically. When it rises over the turn off
threshold voltage VTHOFF, APR343 pulls the drive signal down after a turn off delay (tDOFF).
Minimum On Time
When the controlled MOSFET gate is turned on, some ringing noise is generated. The minimum on-time timer blanks the VTHOFF comparator,
keeping the controlled MOSFET on for at least the minimum on time. If VTHOFF falls below the threshold before minimum on time expires, the
MOSFET will keep on until the end of the minimum on time.
The minimum on time is in direct proportion to the (VDET-VCC)*tONP. When (VDET-VCC)*tONP=5V*5µs, the minimum on time is about 1.8µs.
The Value and Meaning of AREF Resistor
As to DCM operation Flyback converter, after secondary rectifier stops conduction the primary MOSFET Drain-to-source ringing waveform is
resulted from the resonant of primary inductance and equivalent switch device output capacitance. This ringing waveform probably leads to
Synchronous Rectifier error conduction. To avoid this fault happening, APR343 has a special function design by means of volt-second product
detecting. From the sensed voltage of VDET pin to see, the volt-second product of voltage above VCC at primary switch on time is much higher
than the volt-second product of each cycle ringing voltage above VCC. Therefore, before every time Synchronous Rectifier turning on, APR343
judges if the detected volt-second product of VDET voltage above VCC is higher than a threshold and then turn on synchronous Rectifier. The
purpose of AREF resistor is to determine the volt-second product threshold. APR343 has a parameter, Kqs, which converts RAREF value to volt-
second product.
Area2 RAREF *Kqs
In general, Area1 and Area3 value depend on system design and always are fixed after system design frozen. As to BCD PSR design, the Area1
value changes with primary peak current value and Area3 value generally keeps constant at all of conditions. So the AREF resistor design should
consider the worst case, the minimum primary peak current condition. Since of system design parameter distribution, Area1 and Area3 have
moderate tolerance. So Area2 should be designed between the middle of Area1 and Area3 to keep enough design margin.
Area3 RAREF *Kqs Area1
Area1=(VDET-VCC)*tONP
Area3
VDET
VCC
Area2=Kqs*RAREF
Figure 3. AREF Function
SR Minimum Operating Voltage
APR343 sets a minimum SR operating voltage by comparing the difference between VDET and output voltage (VCC). The value of VDET–VCC must be
higher than its internal reference, then APR343 will begin to integrate the area of (VDET–VCC)*tONP. If not, the area integrating will not begin and the
SR driver will be disabled.
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December 2014
© Diodes Incorporated
APR343
Document number: DS36884 Rev. 4 - 2
A Product Line of
Diodes Incorporated
APR343
Ordering Information
APR343 X XX – XX
Product Name
Package
K : SOT25
Packing
TR : Tape & Reel
RoHS/Green
G1 : Green
Package
Temperature Range
-40C to +85C
Part Number
APR343KTR-G1
Marking ID
Packing
SOT25
GHZ
3000/Tape & Reel
Marking Information
(Top View)
: Logo
GHZ: Marking ID
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© Diodes Incorporated
APR343
Document number: DS36884 Rev. 4 - 2
A Product Line of
Diodes Incorporated
APR343
Package Outline Dimensions (All dimensions in mm(inch).)
(1) Package Type: SOT25
2.820(0.111)
3.100(0.122)
0.100(0.004)
0.200(0.008)
0.200(0.008)
0.700(0.028)
REF
0.300(0.012)
0.500(0.020)
0°
8°
0.950(0.037)
TYP
1.800(0.071)
2.000(0.079)
0.000(0.000)
0.150(0.006)
0.900(0.035)
1.300(0.051)
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December 2014
© Diodes Incorporated
APR343
Document number: DS36884 Rev. 4 - 2
A Product Line of
Diodes Incorporated
APR343
Suggested Pad Layout
(1) Package Type: SOT25
E2
G
Z
E1
Y
X
Z
Dimensions
G
X
Y
E1
E2
(mm)/(inch)
(mm)/(inch)
(mm)/(inch)
(mm)/(inch)
(mm)/(inch)
(mm)/(inch)
Value
3.600/0.142
1.600/0.063
0.700/0.028
1.000/0.039
0.950/0.037
1.900/0.075
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© Diodes Incorporated
APR343
Document number: DS36884 Rev. 4 - 2
A Product Line of
Diodes Incorporated
APR343
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
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indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
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This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2014, Diodes Incorporated
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© Diodes Incorporated
APR343
Document number: DS36884 Rev. 4 - 2
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