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Corporate presentation 2013-06-06
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GS66508T HALF-BRIDGE EVAL BOARD QUICK START GUIDE
Aug 27, 2015
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Agenda
Overview of EVAL Board Interface introduction
Quick Start Procedure for Pulse Switching Test Operation procedures & sample test demonstration
Quick Start Procedure for Synchronous Buck DC/DC GS66508T Buck Converter Test-1500W
Quick Start Procedure for Synchronous Boost DC/DC GS66508T Boost Converter Test-1500W
Gate Drive Reference Design Example
Buck/Boost Efficiency Test
Device Junction Temp Measurement
Test Bench
3
Gate Drive Supply +12VDC
+5V PWM_L Input
PWM_H Select Jumper
Low Side VGS Measurement
High Side VGS Measurement*
CON1 CON2
CON3
CON4
CON5 CON6
*Warning: should use differential probe when measure high side VGS
**C17: keep C17 for Buck DC/DC test, remove C17 for Boost DC/DC test & Pulse Switching Test
C17**
Device Temp Monitoring Holes
Low Side VDS Measurement
J1
J5
Q1
Q2
J4
J7
Overview of EVAL Board
Optional Dead Time Adjustment Trimpot N/I-Not Installed by Default
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Quick Start Procedure for Pulse Switching Test
D
S
D
S
C6-C10
CON2
VSW
CON6
CON4CON3
CON1
CON5
+
LOUT
Power Supply DC Input
Q1
Q2
1. With power off, connect the input power supply bus to +Vin (CON1) and ground/return to –Vin (CON5) . 2. With power off, connect gate drive supply connector to J1. 3. With power off, connect the input PWM control signal BNC connector to PWM_L (J5). 4. With power off, connect inductor* to CON3 and CON6. 5. With power off, connect oscilloscope probes to J7 and J6 and observe low side VGS and VDS. Also, use current probe to observe inductor current 6. Turn on the gate drive supply +12VDC. 7. Turn on the function generator with +5V PWM input**, use burst and trigger mode, set pulse cycle (2-5), set pulse period (starting from 2us). 8. Turn on the bus voltage to required value***. 9. Press button trigger, once operational, observe the output switching behavior and other parameters. 10. Slowly adjust pulse period, press trigger again, and observe the switching behavior. 11. For shutdown, please follow steps in reverse.
*Inductor: we use HF467-600M-40AV (60uH/40Amp), two connected in series. **Make sure function generator output is inverted (High when not triggered, see next page waveform). ***For pulse switching test, recommend maximum 400V/30A switching current. Warning: should use differential probe when measure high side VGS.
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GS66508T Half-bridge Pulse Switching Test
Miller Voltage =~1V
Ch1: VGSL (High when not triggered)
400V/0-30A inductive pulse test
V-pk = ~-2V@30A
Ch4: IL
Gate Drive Switching Waveforms • Inductive load pulse testing to verify gate
driver stability over the current range • Si8261BAC Gate driver • RON=25Ω / ROFF=0Ω • Ferrite bead added on high side device
(hard switching): 15R@100MHz • No oscillation and minimum drain voltage
overshoot
30A
Ch2:VDS
D
S
D
S
VSW
QH
GS66508T
VIN+
HS Gate
Driver
LS Gate
Driver
G
GQL
GS66508T
VIN-
VOUT
VDS
ILVGS_L
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Turn-on (400V/22A)
Vmiller = 0.8V < Vth Turn-off voltage spike <0.5V
Negative spike -1.5V ~ -2V
GS66508T Half-bridge Pulse Switching Test
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Quick Start Procedure for Synchronous Buck DC/DC
1. With power off, connect the input power supply bus to +Vin (CON1) and ground/return to –Vin (CON5) . 2. With power off, connect gate drive supply connector to J1. 3. With power off, connect the input PWM control signal BNC connector to PWM_L (J5). 4. With power off, connect inductor to CON3 and CON4. 5. With power off, connect DC electrical load to CON4 and CON6. 6. With power off, connect oscilloscope probes to J7 and J6 and observe low side VGS and VDS. Also, use current probe to observe inductor current 7. Turn on the gate drive supply +12VDC. 8. Turn on the function generator with +5V PWM input (Example frequency: 100kHz or 200kHz). 9. Turn on the bus voltage to required value (Suggest 400V or below). 10. Once operational, observe the output switching behavior, efficiency and other parameters. 11. For shutdown, please follow steps in reverse.
D
S
D
S
C6-C10
VSW
LOUT
VOUT+
VOUT-
COUT LOAD
+
CON2
CON6
CON4
CON3
CON1
CON5
Warning: should use differential probe when measure high side VGS
Power Supply DC Input
Q1
Q2
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Test example: GS66508T Buck Converter Test-1500W
Test Conditions: Vin=400V Pin=1505W Duty Cycle=50% Fsw=100kHz o Vout=195.76V o Iout=7.59A o Pout=1485.6W Running time: 20min Efficiency=98.71% Temp:63⁰C
Low side gate voltage
Inductor current
Vds
6.5V
400V
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D
S
D
S
C6-C10
VSW
LIN
VIN+
VOUT-
200VDC
INPUT
+
LOAD
VOUT+
VOUT-
CON2CON1
CON4CON3
CON6CON5
1. With power off, connect the input power supply bus to +Vin (CON4) and ground/return to –Vin (CON6) . 2. With power off, connect gate drive supply connector to J1. 3. With power off, connect the input PWM control signal BNC connector to PWM_L (J5). 4. With power off, connect inductor to CON3 and CON4. 5. With power off, connect DC electrical load to CON1 and CON5. 6. With power off, connect oscilloscope probes to J7 and J6 and observe low side VGS and VDS. Also, use current probe to observe inductor current 7. Turn on the gate drive supply +12VDC. 8. Turn on the function generator with +5V PWM input (Example frequency: 100kHz or 200kHz). 9. Turn on the bus voltage to required value (Suggest 200V or below). 10. Once operational, observe the output switching behavior, efficiency and other parameters. 11. For shutdown, please follow steps in reverse.
Warning: should use differential probe when measure high side VGS
Power Supply DC Input
Q1
Q2
Quick Start Procedure for Synchronous Boost DC/DC
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Test Conditions: Vin=200V Pin=1510.98W Duty Cycle=50% Fsw=100kHz o Vout=391.37V o Iout=3.817A o Pout=1493.85W Running time: 20min Efficiency=98.87% Temp:60⁰C
Low side gate voltage
Inductor current
Vds
6.5V
400V
Test example: GS66508T Boost Converter Test-1500W
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Gate Drive Reference Design Example – GS66508T HB
C2: 220pF FB1: 15ohm@100MHz (Wurth Electronics P/N: 74279268) D1: 20V/1A Low VF Schottky Rectifier PMEG2010 D2: 6.8V 200mW Zener diode SOD323 (MMSZ5235BS-7-F)
D
G
S
GS66508T15-25R
VDD
ANODE VO1
VO2
GND
0603
RGON
0R
RGOFF
0603
SI8261BAC
Q1
0VGD
PWM_IN
DRAIN
SOURCE
From isolator /
level shift output
+6.5VC11uF0603
CATH
N/C2
332R0603
N/C1
D1
C2100-220pF0603
0VGD
FB1
0.5A
15R@100Mhz0603
Opt. Ferrite bead
for oscillation
suppression
D2
Low Vf Schottky
Diode or 6.8V
zener diode close
to Q1
0V
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BUCK DC/DC
Vin(V) Pin(W) Fsw(kHz) Duty Cycle Vout(V) Iout(A) Pout(W) Efficiency Temperature(⁰C)
400 107 100 50% 200 0.493 98.6 92.15% 26
400 504.8 100 50% 198.93 2.494 495.93 98.24% 27.3
400 993.2 100 50% 196.21 4.99 979 98.59% 51
400 1505 100 50% 195.757 7.589 1485.6 98.71% 63.7
BOOST DC/DC
Vin(V) Pin(W) Fsw(kHz) Duty Cycle Vout(V) Iout(A) Pout(W) Efficiency Temperature(⁰C)
200 207 100 50% 398.16 0.497 197.88 95.60% 26
200 405 100 50% 396.8 1 396.8 97.97% 26
200 796 100 50% 393 1.989 781.68 98.20% 43
200 1031.04 100 50% 392.45 2.591 1016.84 98.62% 49
200 1510.98 100 50% 391.37 3.817 1493.85 98.87% 60
90,00%
92,00%
94,00%
96,00%
98,00%
100,00%
0 2 4 6 8
EFFI
CIE
NC
Y (
%)
OUTPUT CURRENT (A)
BUCK DC/DC (Typical: 400VIN 200VOUT)
95,00%
96,00%
97,00%
98,00%
99,00%
100,00%
0 1 2 3 4
EFFI
CIE
NC
Y (
%)
OUTPUT CURRENT (A)
BOOST DC/DC (Typical: 200VIN 400VOUT)
BUCK/BOOST Efficiency Test
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Device Junction Temp Measurement
FAN
Devices Temp Monitoring (Boost DC/DC-1500W) Note: besides heatsink, a fan is also used to cool the devices
Thermal Camera Model: FLIR-T62101
60⁰C
Device Temp Monitoring Holes
Q1
Q2
• Q1/Q2 at bottom side. • Use thermal camera to measure device junction temperature, make sure the two holes are within camera monitoring area. • High-side hole monitors Q1 junction temp. • Low-side hole monitors Q2 junction temp.
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Test Bench
#1 Multi-meter measure VOUT
#2 Multi-meter measure IOUT
Function Generator (+5V PWM)
1. Provide gate drive supply +12V
2. Provide power to fan
DC Power Supply
Electrical DC Load
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Contact
ECOMAL Europe GmbH
Technical Support Center Europe
Kerkrader Str. 10
D - 35394 Gießen / Germany
ECOMAL Europe GmbH
Line Management Europe
Kerkrader Str. 10
D - 35394 Gießen / Germany
line - [email protected]
European Headquarters ECOMAL Europe GmbH
Wilhelm - Schauenberg - Strasse 7
79199 Kirchzarten
Germany
Phone +49 (0)7661 395 - 0
Fax +49(0)7661 395 - 35
E - Mail [email protected]
www.ecomal.com
Martin Behlke
Managing Director
