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ISL81806EVAL1Z
Evaluation Board
The ISL81806EVAL1Z dual-phase evaluation board (shown in
voltage dual synchronous buck controller, optimized for E-mode GaN FET, with external soft-start, independent
enable functions and UV/OV/OC/OT protection. A programmable switching frequency ranging from 100kHz to
2MHz helps to optimize the inductor size while the strong gate driver delivers up to 20A for the buck output.
Key Features
▪ Wide input range: 18V to 80V
▪ High light-load efficiency in pulse skipping DEM operation
▪ Programmable soft-start
▪ Optional DEM/PWM operation
▪ Optional CC/HICCUP OCP protection
▪ Supports pre-bias output with soft-start
▪ PGOOD indicator
▪ OVP, OTP, and UVP protection
▪ Back-biased from output to improve efficiency
Specifications
The ISL81806EVAL1Z dual-phase evaluation board is designed for high current applications. The current rating of
the ISL81806EVAL1Z is limited by the FETs and inductor selected. The ISL81806EVAL1Z electrical ratings are
shown in
Table
1.
Parameter
Input Voltage
Switching Frequency
Output Voltage
Output Current
Average Current OCP Setting Point
Pulse by Pulse OCP Setting Point
Hiccup OCP Setting point
Ordering Information
Part Number
ISL81806EVAL1Z
Related Literature
For a full list of related documents, visit our website:
▪
ISL81806
device page
X0119392 Rev.1.1
May 13, 2021
Table 1. ISL81806EVAL1Z Electrical Ratings
18V to 80V
500kHz
12V
20A
25A (Constant Current Setting Point)
20.5A (Each phase)
24.5A (Each phase)
High Voltage Dual Phase Buck Controller GaN FETs Evaluation Board
Figure
4) features the ISL81806, an 80V high
Rating
Description
© 2021 Renesas Electronics
User Manual
Page 1
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Table of Contents
Related Manuals for Renesas ISL81806EVAL1Z
Summary of Contents for Renesas ISL81806EVAL1Z
- Page 1 ▪ Back-biased from output to improve efficiency Specifications The ISL81806EVAL1Z dual-phase evaluation board is designed for high current applications. The current rating of the ISL81806EVAL1Z is limited by the FETs and inductor selected. The ISL81806EVAL1Z electrical ratings are shown in Table Table 1.
- Page 2 Figure 1. ISL81806EVAL1Z Block Diagram...
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Page 3: Functional Description
ISL81806EVAL1Z User Manual 1. Functional Description The ISL81806EVAL1Z is the same test board used by Renesas application engineers and IC designers to evaluate the performance of the ISL81806. The board provides an easy and complete evaluation of all the IC and board functions. - Page 4 ISL81806EVAL1Z User Manual Figure 3. Proper Test Setup X0119392 Rev.1.1 Page 4 May 13, 2021...
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Page 5: Board Design
GaN FETs. 2. If signal components and the IC are placed separately from the power train, Renesas recommends using full ground planes in the internal layers with shared SGND and PGND to simplify the layout design. Otherwise, use separate ground planes for the power ground and the small signal ground. - Page 6 ISL81806EVAL1Z User Manual 12. Ensure the feedback connection to the output capacitor is short and direct. ISL81806EVAL1Z Evaluation Board Figure 4. ISL81806EVAL1Z Evaluation Board, Top View Figure 5. ISL81806EVAL1Z Evaluation Board, Bottom View X0119392 Rev.1.1 Page 6 May 13, 2021...
- Page 7 ISL81806EVAL1Z Circuit Schematic Figure 6. Schematic...
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Page 8: Bill Of Materials
ISL81806EVAL1Z User Manual Bill of Materials Reference Designator Description Manufacturer Manufacturer Part PWB-PCB, MTL (Multilayer PCB ISL81806EVAL1ZREVFPCB ISL81806EVAL1Z, REVF, International) ROHS CAP, SMD, 0603, 0.01µF, C1608C0G1H103J080AE 50V, 5%, C0G/NP0, SOFT TERMINATION, ROHS C52, C54, C55 CAP, SMD, 0603, 1000pF, C1608X7R1H102K 50V, 10%, X7R, ROHS CAP, SMD, 0603, 0.1µF,... - Page 9 ISL81806EVAL1Z User Manual Reference Designator Description Manufacturer Manufacturer Part C6, C7, C8, C31, C32 CAP-OSCON, SMD, PANASONIC 100SXV27M 10.3mm, 27µF, 100V, 20%, 30mΩ, POLYMER, ROHS CAP, SMD, 10.3mm, PANASONIC 16SVPK12000M 1200µF, 16V, 20%, 12mΩ, ALUM.POLYMER, ROHS L1, L2 COIL-PWR INDUCTOR, SPM10065VT-3R3M-D AEC-Q200, SMD, 10.5x10,...
- Page 10 ISL81806EVAL1Z User Manual Reference Designator Description Manufacturer Manufacturer Part RES, SMD, 0603, 5.1Ω, YAGEO RC0603FR-075R1L 1/10W, 1%, TF, ROHS R14, R28 RES, SMD, 0603, 10k, VENKEL CR0603-10W-1002FT 1/10W, 1%, TF, ROHS R30, R32, R42, R43 RES, SMD, 0603, 100k, VENKEL...
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Page 11: Board Layout
ISL81806EVAL1Z User Manual Board Layout Figure 7. Silkscreen Top Figure 8. Top Layer X0119392 Rev.1.1 Page 11 May 13, 2021... - Page 12 ISL81806EVAL1Z User Manual Figure 9. Second Layer (Solid Ground) Figure 10. Third Layer X0119392 Rev.1.1 Page 12 May 13, 2021...
- Page 13 ISL81806EVAL1Z User Manual Figure 11. Fourth Layer Figure 12. Fifth Layer X0119392 Rev.1.1 Page 13 May 13, 2021...
- Page 14 ISL81806EVAL1Z User Manual Figure 13. Bottom Layer Figure 14. Silkscreen Bottom X0119392 Rev.1.1 Page 14 May 13, 2021...
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Page 15: Design Example
ISL81806EVAL1Z User Manual 3. Design Example Design Requirements Parameter Rating Input Voltage 18V to 80V Switching Frequency 500kHz Output Voltage Output Current Peak Current Limit Set Point 20.5A per phase Output Mode Dual phase PWM Mode Forced PWM OCP Mode... - Page 16 ISL81806EVAL1Z User Manual The V UVP falling threshold is calculated using Equation – UVLO _ THR UVLO _ HYST ------------------------------------------------------------------------------------------------------------------------------------------------------- - UVFALL (EQ. 4) ) 6.8μA ) 48.7kΩ 1.8V 430kΩ 48.7kΩ 430kΩ – 14.77V ------------------------------------------------------------------------------------------------------------------------------------ - 48.7kΩ where V is the 1.8V UVLO rising threshold and I is the 6.8µA UVLO hysteresis current.
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Page 17: Inductor Selection
ISL81806EVAL1Z User Manual Inductor Selection The inductor value determines the ripple current of the converter. The ripple voltage is a function of the ripple current and the output capacitor(s) ESR. Assume the ripple current ratio is 80% of the inductor average current at the maximum input voltage and the full output load condition. - Page 18 RMSMAX OUTMAX Renesas recommends using a mix of input bypass capacitors to control the voltage ripple across the GaN FETs. Use ceramic capacitors for the high frequency decoupling and bulk capacitors to supply the RMS current. Five 27µF electrolytic capacitors with 0.94A rating current and eight 25.2µF ceramic capacitors are used to share the 2.5A RMS input current on this board.
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Page 19: Output Mode Selection
A resistor less than 30kΩ sets the converter to forced PWM mode, while a resistor higher than 30kΩ sets the converter to DE mode. Considering the tolerance in all temperature ranges, Renesas recommends using 20kΩ to set Forced PWM mode and 39kΩ to set DE mode. With a GaN FET application, there is an approximately 1MΩ... -
Page 20: Phase Lock Loop (Pll)
), C ), and C ) are needed to connect to PLL1 PLL2 the PLL_COMP pin to ensure PLL stable operation. Renesas recommends choosing 2.7kΩ for R , 10nF for , and 820pF for C PLL1 PLL2 3.17 Feedback Loop Compensation... - Page 21 ISL81806EVAL1Z User Manual Select a standard value resistor R = 4.7kΩ. A larger C makes the loop more stable by giving a larger COMP COMP1 phase margin, but the loop bandwidth is lower. Lower R improves stability but slows the loop response.
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Page 22: Typical Performance Curves
ISL81806EVAL1Z User Manual 4. Typical Performance Curves = 48V, T = 25°C, unless otherwise noted. 12.2 12.1 12.0 11.9 11.8 11.7 11.6 11.5 11.4 Load Current (A) Load Current (A) Figure 16. Efficiency, CCM Figure 17. Load Regulation, CCM V_sw1 50V/Div... - Page 23 ISL81806EVAL1Z User Manual = 48V, T = 25°C, unless otherwise noted. (Cont.) V_PHASE1 50V/Div I_L2 5A/Div V_OUT 10V/Div I_L1 5A/Div I_L1 10A/Div V_EN 2V/Div I_L2 10A/Div V_IN 20V/Div 4ms/Div 4µs/Div Figure 22. Start-Up V = 48V, I = 20A, CCM Figure 23.
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Page 24: Revision History
ISL81806EVAL1Z User Manual 5. Revision History Rev. Date Description May 13, 2021 In 1. Functional Description, corrected “ambient room” to “room ambient”. Removed OCP Set Point and added Peak Current Limit Set Point to 3.1 Design Requirements. Updated 3.3, 3.8, 3.13, 3.14. -
Page 25: Corporate Headquarters
Renesas' products are provided only subject to Renesas' Terms and Conditions of Sale or other applicable terms agreed to in writing. No use of any Renesas resources expands or otherwise alters any applicable warranties or warranty disclaimers for these products. - Page 26 Renesas' products are provided only subject to Renesas' Terms and Conditions of Sale or other applicable terms agreed to in writing. No use of any Renesas resources expands or otherwise alters any applicable warranties or warranty disclaimers for these products.
- Page 27 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Renesas Electronics ISL81806EVAL1Z...
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