DEMO MANUAL DC2793A DESCRIPTION LT8316 High VIN No Opto Synchronous Flyback Converter Demonstration circuit 2793A is a high VIN no-opto syn-chronous flyback converter featuring the 8316LT. The demo board outputs 5V and maintains tight regulation with a load current from 70mA to 7A. It is optimized to
DEMO MANUAL DC2793A
LT8316 High VIN No Opto Synchronous Flyback Converter
DESCRIPTION
Demonstration circuit 2793A is a high VIN no-opto synchronous flyback converter featuring the LT®8316. The demo board outputs 5V and maintains tight regulation with a load current from 70mA to 7A. It is optimized to operate over a wide 140V to 450V DC input voltage range. Output voltage accuracy stays within ±5% over the entire input voltage and load range.
On the secondary side, the LT8309 synchronous rectifier driver senses the synchronous MOSFET drain-to-source voltage to determine its turn-on period. By replacing the diode rectifier with an N-Channel MOSFET, the efficiency and thermal performance is greatly improved.
The LT8316 is a 600V flyback controller. No opto-isolator is needed for regulation. The part samples the output voltage from the isolated flyback waveform appearing across a third winding on the transformer. Quasi-resonant
boundary mode operation improves load regulation. At start-up, the INTVCC capacitor is charged via a high voltage current source; during normal operation, the current source turns off to save power consumption.
DC2793A features an option to turn on standby mode by simply changing the position of a jumper from "DIS" to "EN". Standby mode reduces the minimum switching frequency to 220Hz for ultralow quiescent power consumption.
The LT8316 and LT8309 data sheets give a complete description of the parts, and operation and application information. The data sheets must be read in conjunction with this quick start guide for demo circuit 2793A.
Design files for this circuit board are available.
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
PARAMETER Input Voltage Output Voltage Maximum Output Current Output Voltage AC Ripple (Peak-to-Peak)
Typical Switching Frequency
Efficiency
Specifications are at TA = 25°C CONDITIONS
IOUT = 70mA to 7A
VIN = 140V, IOUT = 7A VIN = 450V, IOUT = 7A VIN = 140V, IOUT = 7A VIN = 450V, IOUT = 7A VIN = 140V, IOUT = 7A VIN = 450V, IOUT = 7A
MIN TYP MAX
140
450
4.75
5
5.25
7
80 20
45 75
89 88
UNITS
V
V
A
mVP-P mVP-P
kHz kHz
% %
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DEMO MANUAL DC2793A
QUICK START PROCEDURE
IMPORTANT NOTE TO CUSTOMERS:
HIGH VOLTAGES ARE PRESENTED ON THE DEMO CIRCUIT, AND CAN LEAD TO LETHAL INJURIES TO HUMAN BODY. ONLY QUALIFIED PERSONNEL SHOULD OPERATE IT. IT IS STRONGLY RECOMMENDED TO USE SAFETY GLASSES AND AN ISOLATION TRANSFORMER.
NOTE: IMPROPER COMPONENT REPLACEMENT ON THE DEMO CIRCUIT CAN CAUSE PERFORMANCE DETERIORATIONS, CIRCUIT MALFUNCTION, PROPERTY DAMAGE, AND EVEN LIFETHREATENING INJURIES. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERS FOR PROPER COMPONENT REPLACEMENT.
Demonstration circuit 2793A is easy to set up to evaluate the performance of the LT8316. Refer to Figure 1 for proper measurement equipment setup and follow the procedure:
1. Set an input power supply that is capable of 140V to 450V to 140V adjustments. Then turn off the supply.
2. With power off, connect the DC input power supply to the board through +VIN and VIN terminals. Connect the load to the terminals +VOUT and VOUT on the board.
3. Turn on the power at the input.
NOTE: Make sure that the input voltage does not exceed 450V.
4. Check for the proper output voltages. The output should be regulated at 5V (±5%).
NOTE: The LT8316 requires very small minimum load to maintain good output voltage regulation. A Zener diode is placed on the output to clamp the voltage to 5.6V. This Zener can be replaced with a 75 resistor at the trade-off of lower efficiency.
5. Once the proper output voltage is established, adjust the input voltage and load current within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters.
NOTE: When measuring the input or output voltage ripples, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip directly across the +VOUT and VOUT terminals. See Figure 2 for proper scope probe technique.
Figure 3 and Figure 4 provide additional demo board performance information.
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2
QUICK START PROCEDURE
+ IIN
+
POWER
SUPPLY
+
VIN
DEMO MANUAL DC2793A
IOUT
+
+
VOUT
LOAD
Figure 1. Proper Measurement Equipment Setup
DC2793A F01
INPUT OR OUTPUT CAPACITOR
Figure 2. Proper Scope Probe Placement for Measuring Input or Output Ripple
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DEMO MANUAL DC2793A
QUICK START PROCEDURE
EFFICIENCY (%)
95
90
85
80
75
70
65
60
55
140VIN
50
300VIN 450VIN
45
01234567
LOAD CURRENT (A)
DC2793A F03
Figure 3. Typical Efficiency Curve
VSW 200V/DIV
VSW 200V/DIV
VSW 200V/DIV
5µs/DIV
DC2793A F04a
VIN = 450V, IOUT = 7A QUASI-RESONANT BOUNDARY MODE
5µs/DIV
VIN = 450V, IOUT = 2A DISCONTINUOUS MODE
DC2793A F04b
5µs/DIV
VIN = 450V, IOUT = 0A Burst Mode OPERATION
a)
b)
c)
Figure 4. Switch Node Voltage Waveform at Different Load Conditions
DC2793A F04c
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DEMO MANUAL DC2793A
PARTS LIST
ITEM QTY REFERENCE
PART DESCRIPTION
Required Circuit Components
1
1 C1
CAP., ALUM., 10µF, 500V, 20%
2
2 C2, C3
CAP., X7T, 0.22µF, 630V, 10%, 1812
3
3 C4, C9, C13
CAP., X5R, 4.7µF, 50V, 10%, 0805
4
1 C5
CAP., NP0, 47pF, 50V, 5%, 0603
5
1 C6
CAP., NP0, 100pF, 50V, 5%, 0603
6
1 C7
CAP., X7R, 0.22µF, 25V, 10%, 0603
7
1 C10
CAP., X7R, 1000pF, 25V, 10%, 0603
8
1 C11
CAP., Y5U, 2200pF, 400VAC, 20%
9
1 C12
CAP., X7S, 1µF, 100V, 10%, 0805
10
5 C14, C15, C16, C18, C19 CAP., X5R, 100µF, 10V, 20%, 1210
11
1 C17
CAP., ALUM., 1500µF, 6.3V, 20%
12
1 C20
CAP., NP0, 120pF, 100V, 10%, 0603
13
1 D1
DIODE, 200V, SOD323
14
1 D2
DIODE, TVS, 324VC, SMA
15
1 D3
DIODE, 800V, SOD123F
16
1 D4
DIODE, 150V, SOD123
17
1 D5
DIODE, ZENER, 36V, SOD123
18
1 D6
DIODE, ZENER, 5.6V, SMA
19
1 D7
DIODE, 100V, SOD123F
20
1 L1
IND., 1µH, 20%
21
1 Q1
MOSFET, N-CH, 800V, DPAK
22
1 Q2
MOSFET, N-CH, 80V, PG-TDSON-8
23
3 R1, R2, R3
RES., 243k, 1/4W, 1%, 1206
24
1 R4
RES., 61.9k, 1/10W, 1%, 0603
25
1 R5
RES., 6.04k, 1/10W, 1%, 0603
26
1 R6
RES., 100 , 1/8W, 1%, 0805
27
1 R7
RES., 10k, 1/10W, 1% 0603
28
1 R8
RES., 6.98k, 1/10W, 1% 0603
29
1 R9
RES., 100, 1/10W, 1%, 0603
30
1 R10
RES., 10, 1/10W, 1%, 0603
31
1 R11
RES., 4.99k, 1/10W, 1% 0603
32
1 R12
RES., 0.062, 1W, 1%, 1206 WIDE
33
1 R14
RES., 0, 1/10W, 0603
34
1 R15
RES., 3.32k, 1/4W, 1%, 1206
35
1 R16
RES., 3, 1/2W, 5%, . 1206
36
1 R17
RES., 68.1k, 1/10W, 1%, 0603
37
1 T1
TRANSFORMER, PQ2620
38
1 U1
I.C., LT8316EFE, TSSOP20FE(16)
39
1 U2
I.C., RECTIFIER DRIVER, TSOT23-S5
MANUFACTURER/PART NUMBER
NICHICON, UCY2H100MHD TDK, C4532X7T2J224K200KC MURATA, GRM21BR61H475KE51L MURATA, GRM1885C1H470JA01D MURATA, GRM1885C1H101JA01D MURATA, GRM188R71E224KA88D MURATA, GRM188R71E102KA01D VISHAY, 440LD22-R MURATA, GRM21BC72A105KE01L MURATA, GRM32ER61A107ME20L PANASONIC, 6SEPC1500M AVX, 06031A121KAT2A DIODES INC., BAV21WS-7-F BOURNS INC., SMAJ200A CENTRAL SEMI., CMMR1U-08 DIODES INC., BAV20W-7-F CENTRAL SEMI., CMHZ5258B CENTRAL SEMI., CMZ5919B TR13 DIODES INC., 1N4148W-7-F COILCRAFT, XAL6030-102ME INFINEON, IPD80R450P7ATMA1 INFINEON, BSC052N08NS5ATMA1 VISHAY, CRCW1206243KFKEA VISHAY, CRCW060361K9FKEA VISHAY, CRCW06036K04FKEA VISHAY, CRCW0805100RFKEA VISHAY, CRCW060310K0FKEA VISHAY, CRCW06036K98FKEA VISHAY, CRCW0603100RFKEA VISHAY, CRCW060310R0FKEA VISHAY, CRCW06034K99FKEA SUSUMU, PRL1632-R062-F-T1 VISHAY, CRCW06030000Z0EA VISHAY, CRCW12063K32FKEB VISHAY, CRCW12063R00JNEA VISHAY, CRCW060368K1FKEA SUMIDA, PQ2620, 11328-T060 ANALOG DEVICES, LT8316EFE#PBF ANALOG DEVICES, LT8309ES5#PBF
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DEMO MANUAL DC2793A
PARTS LIST
ITEM QTY REFERENCE
PART DESCRIPTION
Additional Demo Board Circuit Components
1
2 E1, E2
TESTPOINT, TURRET, .094" MTG. HOLE
2
2 E3, E4
TESTPOINT, TURRET, .061" MTG. HOLE
3
1 JP1
HEADER 3 PIN 0.079 SINGLE ROW
4
2 J1, J2
JACK BANANA
5
4 MH1-MH4
STAND-OFF, NYLON 0.375"
Hardware: For Demo Board Only
1
0 C21
CAP., OPTION, 0603
2
0 R13
RES., OPTION, 0603
MANUFACTURER/PART NUMBER
MILL-MAX, 2501-2-00-80-00-00-07-0 MILL-MAX, 2308-2-00-80-00-00-07-0 WURTH ELEKTRONIK , 62000311121 KEYSTONE, 575-4 WURTH ELEKTRONIK, 702933000
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SCHEMATIC DIAGRAM
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
5
4
3
2
1
C11 2200pF
+VIN
140-450V
D
-VIN
E1 + C1 10uF 500V
E2
C2 0.22uF
630V 1812
UCY2H100MHD
C3 0.22uF
R1
630V 1812
243K 1206
R2 243K 1206
C4 4.7uF 50V 0805
R8 6.98k
R3 243K 1206
123 Vin Vin Vin
17 EN/UVLO
13
C
Vc
D1 BAV21WS-7-F
R6 100 0805
C5 47pF
R7 10K
U1
LT8316EFE
9
10
BIAS DCM
R4 61.9K
T1 11328-T060
6 11 10
5
1 9 8
3
12 FB
R13 OPT
D2
SMAJ200A C21 R11 OPT 4.99K
3
L1 1uH XAL6030-102ME
E3
D
J1
+VOUT
5V/7A
C14 100uF 10V 1210
C15 100uF 10V 1210
C16
C17
D6
100uF + 1500uF
10V 1210
6.3V 6SEPC1500M CMZ5919B
C18 100uF 10V 1210
C19 100uF 10V 1210
-VOUT J2
5
Q2 BSC052N08NS5
4
R14
0
E4
C
1
2
C6 100pF
R5 6.04k
C7 220nF
R17 68.1K
14 IREG/SS
11 TC
19 GATE
18 SENSE
D3 CMMR1U-08
R10 10
R9
R16
Q1 IPD80R450P7
D4
3
BAV20W-7-F 1206
D5 CMHZ5258B
C12 1uF 100V 0805
U2 LT8309ES5
4
3
VIN INTVCC
2 GND
C13 4.7uF 50V 0805
C9
4.7uF 50V 0805
8 INTVcc
16 SMODE
20 GND
C10 100 1nF
R12 0.062 KRL3216
R15
3.32k 1% 1206
5 DRAIN
C20 120pF
1 GATE
B
GND GND
100V
B
2
JP1
3
1
EN DIS
15
21
D7 1N4148
STANDBY MODE
DEMO MANUAL DC2793A
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603.
A
5
4
CUSTOMER NOTICE
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
www.analog.com
Phone: (408)432-1900
A
TITLE: SCHEMATIC
HIGH VIN NO OPTO SYNCHRONOUS FLYBACK CONVERTER
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
SIZE IC NO.
N/A
LT8316EFE DC2793A
DATE: Tuesday, October 23, 2018
REV.
3
SHEET 1 OF 1
3
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1
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DEMO MANUAL DC2793A
ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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