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ISL81802EVAL1Z
Evaluation Board
The ISL81802EVAL1Z dual-phase evaluation board (shown in
voltage dual synchronous buck controller that offers external soft-start, independent enable functions, and
integrates UV/OV/OC/OT protection. A programmable switching frequency ranging from 100kHz to 1MHz helps to
optimize 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 ISL81802EVAL1Z dual-phase evaluation board is designed for high current applications. The current rating of
the ISL81802EVAL1Z is limited by the FETs and inductor selected. The ISL81802EVAL1Z electrical ratings are
shown in
Table
1.
Table 1.
ISL81802EVAL1Z Electrical Ratings
Parameter
Input Voltage
Switching Frequency
Output Voltage
Output Current
OCP Set Point
Ordering Information
Part Number
ISL81802EVAL1Z
Related Literature
For a full list of related documents, visit our website:
•
ISL81802
device page
R16UH0002EU0100 Rev.1.00
Aug.24.20
18V to 80V
200kHz
12V
20A
Minimum 22A at ambient room temperature
High Voltage Dual Buck Controller Evaluation Board
Figure
4) features the ISL81802, an 80V high
Rating
Description
User Manual
Page 1 of 23
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Summary of Contents for Renesas ISL81802EVAL1Z
- Page 1 • Back biased from output to improve efficiency Specifications The ISL81802EVAL1Z dual-phase evaluation board is designed for high current applications. The current rating of the ISL81802EVAL1Z is limited by the FETs and inductor selected. The ISL81802EVAL1Z electrical ratings are shown in Table Table 1.
- Page 2 18V-80V 12V/20A Figure 1. ISL81802EVAL1Z Block Diagram...
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Page 3: Functional Description
1. Functional Description Functional Description The ISL81802EVAL1Z is the same test board used by Renesas application engineers and IC designers to evaluate the performance of the ISL81802 TQFN IC. The board provides an easy and complete evaluation of all the IC and board functions. - Page 4 ISL81802EVAL1Z 1. Functional Description Quick Test Guide 1. Jumper J6 provides the option to select PWM or DEM. Jumper J7 provides the option to select a constant current limit or HICCUP. See Table 2 for the operating options. Ensure that the circuit is correctly connected to the supply and electronic loads before applying any power.
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Page 5: Pcb Layout Guidelines
MOSFETs. 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 ISL81802EVAL1Z 2. PCB Layout Guidelines ISL81802EVAL1Z Evaluation Board Figure 4. ISL81802EVAL1Z Evaluation Board, Top View Figure 5. ISL81802EVAL1Z Evaluation Board, Bottom View R16UH0002EU0100 Rev.1.00 Page 6 of 23 Aug.24.20...
- Page 7 ISL81802EVAL1Z Circuit Schematic 18V-80V Figure 6. Schematic...
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Page 8: Bill Of Materials
ISL81802EVAL1Z 2. PCB Layout Guidelines Bill of Materials Reference Designator Description Manufacturer Manufacturer Part PWB-PCB, ISL81802EVAL1Z, Multilayer PCB Technology ISL81802EVAL1ZREVBPCB REVB, ROHS C1, C2 CAP, RADIAL, 12.5x26.5, 220μF, United Chemi-Con EKZN101ELL221MK25S 100V, 20%, ALUM.ELEC., 5mm, ROHS C3, C4, C5, C6, C42, C43,... - Page 9 ISL81802EVAL1Z 2. PCB Layout Guidelines Reference Designator Description Manufacturer Manufacturer Part 80V DUAL-BUCK PWM Renesas Electronics America ISL81802FRTZ CONTROLLER, 32P, TQFN, 5x5, ROHS Q1, Q4, Q6, Q8 TRANSISTOR-MOS, Infineon BSC070N10NS5ATMA1 N-CHANNEL, SMD, 8P, PPK SO-8, 100V, 80A, ROHS Q2, Q3, Q5, Q7...
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Page 10: Board Layout
ISL81802EVAL1Z 2. PCB Layout Guidelines Board Layout Figure 7. Silkscreen Top Figure 8. Top Layer R16UH0002EU0100 Rev.1.00 Page 10 of 23 Aug.24.20... - Page 11 ISL81802EVAL1Z 2. PCB Layout Guidelines Figure 9. Second Layer (Solid Ground) Figure 10. Third Layer R16UH0002EU0100 Rev.1.00 Page 11 of 23 Aug.24.20...
- Page 12 ISL81802EVAL1Z 2. PCB Layout Guidelines Figure 11. Bottom Layer Figure 12. Silkscreen Bottom R16UH0002EU0100 Rev.1.00 Page 12 of 23 Aug.24.20...
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Page 13: Design Example
ISL81802EVAL1Z 3. Design Example Design Example Design Requirements Parameter Rating Input Voltage 18V to 80V Switching Frequency 200kHz Output Voltage Output Current OCP Set Point Output Mode Dual phase PWM Mode Forced PWM OCP Mode Constant current Frequency Setting The default switching frequency of the PWM controller is determined by the resistor R ). -
Page 14: Inductor Selection
ISL81802EVAL1Z 3. Design Example Soft-Start Capacitor The soft-start time for dual-phase is set by the value of the soft-start capacitor C ) connected from SS/TRK1 to GND. The soft-start time with C = 47nF is calculated using Equation 47nF ... - Page 15 RMSMAX OUTMAX Renesas recommends using a mix of input bypass capacitors to control the voltage ripple across the MOSFETs. Use ceramic capacitors for the high frequency decoupling and bulk capacitors to supply the RMS current. Two 220µF electrolytic capacitors with 2.2A rating current and eight 4.7µF ceramic capacitors are used to share the 2.5A RMS input current on this board.
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Page 16: Output Mode Selection
ISL81802EVAL1Z 3. Design Example 3.10 First Level Peak Current Limit and Sense Resistor Selection The inductor peak current is sensed by the sense resistor R ). When the voltage drop on R reaches the set point V typical 85mV, it triggers the pulse-by-pulse peak current limit. With the current limit set point... -
Page 17: Phase Lock Loop (Pll)
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 21kΩ to set Forced PWM mode and 39kΩ to set DE mode. -
Page 18: Parallel Connection
These values provide a good starting point for the compensation design, and the final compensation network should be optimized with bench test. 3.18 Parallel Connection The ISL81802EVAL1Z evaluation board can operate in parallel, in a daisy chain setup. Figure 14 shows the wiring of two units in parallel and Figure 15 shows three units in parallel. - Page 19 1. CLKOUT Phase Shift: CLKOUT rising edge delay after UG1 rising edge. 2. Channel 2 Phase Shift: UG2 rising edge delay after UG1 rising edge. On the ISL81802EVAL1Z board, the IMON2 pin is tied to 5V and EN/UVLO2 is tied to EN/UVLO1, which leads to a default 60° CLKOUT Phase Shift.
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Page 20: Typical Performance Curves
ISL81802EVAL1Z 4. Typical Performance Curves Typical Performance Curves = 48V, T = 25°C, unless otherwise noted. 12.05 12.03 12.01 11.99 11.97 11.95 11.93 Vin = 18V Vin = 24V Vin = 18V Vin = 24V 11.91 Vin = 36V Vin = 48V 11.89... - Page 21 ISL81802EVAL1Z 4. Typical Performance Curves = 48V, T = 25°C, unless otherwise noted. (Continued) 100mV/Div 100mV/Div 10A/Div OUT1 10A/Div OUT1 10A/Div 10A/Div OUT2 OUT2 2ms/Div 2ms/Div Figure 22. Load Transient, V = 48V, I = 0A to 20A, Figure 23. Load Transient, V...
- Page 22 ISL81802EVAL1Z 4. Typical Performance Curves = 48V, T = 25°C, unless otherwise noted. (Continued) 20V/Div 20V/Div 200mV/Div 200mV/Div 10A/Div 10A/Div 10A/Div 10A/Div 20ms/Div 20ms/Div Figure 28. Line Transient, V = 18V to 80V, 1V/ms, Figure 29. Line Transient, V = 80V to 18V, 1V/ms,...
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Page 23: Revision History
ISL81802EVAL1Z 5. Revision History Revision History Rev. Date Description 1.00 Aug.24.20 Initial release R16UH0002EU0100 Rev.1.00 Page 23 of 23 Aug.24.20... - Page 24 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 25 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Renesas Electronics ISL81802EVAL1Z...
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