Kinetic technologies KTC3500 Flyback DC Controller Instruction Manual

EVAL Kit Manual
KTC3500 Boost Configuration EVB

3.5V to 60V Input Boost/SEPIC/Flyback DC-DC Controller

Brief Description

The User Manual describes the design and operation of the KTC3500 boost configuration evaluation board. The KTC3500 EVAL Kit contains the schematic, and the bill of materials for the KTC3500 Evaluation Board. KTC3500 is a low quiescent current DC/DC controller supporting boost, SEPIC, and flyback topologies. It employs currentmode control with internal slope compensation for fast transient response as well as superior output voltage regulation. An analog control loop allows flexibility to set the loop gain to
optimize the controller’s response.
This KTC3500 EVK is configured as a boost converter. The EVK is designed for 7-17 VIN, 24 VOUT, 48W (typical) boost converter applications. For ordering the KTC3500 device, please refer to the KTC3500 data sheet or contact a sales representative.

EVK Ordering Information

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EVAL Kit Physical Contents

User-Supplied Equipment
Required Equipment

1. Bench Power Supply for VIN – 7V/17V and 5A as needed for the intended application.
2. Digital Multimeter – used to measure input/output voltages and currents.
3. Load – either power resistors, an E-Load, or an actual system load.

Optional Equipment

1. Oscilloscope and Voltage Probes – for dynamic testing, measurements, and to observe input/output voltages and currents within waveforms.
2. Additional Digital Multimeters

Recommended Operating Conditions

Jumper Descriptions

L:  Shutdown Mode – switch disabled
H:  Enable Mode – normal switch operation| H

Quick Start Procedures

1. Before connecting the EVAL board to the VIN bench supply, set the supply to 0 Volts. Turn off the supply. While off, connect power cables to the VIN (CN1) and GND (CN3) on the EVAL board and connect to VIN+ and VIN- on the bench supply.
2. Turn on the VIN bench supply and very slowly ramp its voltage to an appropriate voltage. While ramping up VIN slowly, use the bench supply’s output current indication (or a digital multimeter) to monitor the VIN current. Current will flow even though the part is not enabled. If the current becomes high, reduce the VIN voltage quickly to prevent damage. Then inspect the setup for any wiring errors.
3. With valid VIN voltage, use a digital multimeter to check the output voltage between VOUT and GND terminals on the EVAL Kit. It should be 24V.
4. EN is connected to VIN by default through R1 and R2 to enable the output. Connect EN to GND to disable.

Typical Test Setup Diagram
As an example, use the following test setup to measure items 3 and 4 in the Quick Start Procedures.

Electrical Schematic

General Configuration and Description

Physical Access
The table below lists the KTC3500EVAC -MMEV01/connectors functionality.

VIN (CN1)
GND (CN3)| DC input power connector (VIN is positive pin and GND is negative pin)
VOUT (CN2)
GND (CN4)| Output voltage connector (VOUT is positive pin and GND is negative pin)
EN (P1)| Enable signal connector
(By default, KTC3500 is enabled with EN connected to VIN
To disable, connect EN to GND)
TEST POINT| TP1(VIN), TP3(GND), TP2(VOUT), TP4(GND)

Test Setup

1. The “Typical Test Setup Diagram” shows a typical setup for KTC3500-MMEV01. Input voltage can be applied as described in “Recommended Operating Conditions”.
2. EN is connected to Vin by default through R1 and R2. It can also be connected to GND to disable.
3. The EVB can also be turned on by enable control or by an external signal by removing R1: Apply input power, then switch EN pin from logic LOW to logic HIGH.
4. Use a digital multimeter and an electronic load. For input voltages ranging from 7V to 17V, the output voltage is 24V. The maximum output current is 2A.

Printed Circuit Board (PCB)

Layout Guidelines

The PCB layout is divided into power ground and analog ground. The input side and output side power components share a common power ground plane. The IC control components should be grouped together to share an analog ground plane. The power ground and analog ground converge at the IC controller as a single grounding point connection.
The following layout guidelines are recommended for optimum performance.

1. Keep the power stage loop area as small as possible. This includes the input loop (C4, L1, Q1 and R7) and the output loop (L1, C7 and D2).
2. Use a single point connection between AGND (GND of KTC3500) and power GND (See diagram below).
3. Ground all the KTC3500 control components (R2, R3, R8, R10, C12, C13, C14, C15) to AGND, close to the IC.
4. Keep the low-level control circuit traces far away from noisy switching Voltages and Currents.
5. CS pin should sense the current signal through shunt resistor R7. A 100Ω to 1kΩ (R6) and 100pF to 1nF Cap (C15) is used to form an RC filter. It is placed in series with the CS pin and C15 should terminate at AGND near the KTC3500.
6. Keep FB, COMP and CS pins far from high noise sources. In some high output current applications, a typically 10kΩ resistor is suggested to insert between FB pin and output resistor divider network to filter noise. Small capacitors can be added on FB, Comp and CS without effecting stability.

Bill of Materials (BOM)

Designator| Description| QTY| Manufacturer| Manufacturer Part Number
---|---|---|---|---
C1| CAP ALUM HYB 100UF 20%50V SMD| 1| Rubycon| 50PEV100M10X10.5
C2, C3, C4, C5, C6, C7, C8| CAP CER 10uF 50V X5R 1210| 7| Samsung| CL32A106KB.INNNE
C10| CAP CER 0.1UF 50V X5R 0603| 1| Yageo| CC0603KRX5R9BB104
C12| CAP CER 0.22UF 50V X5R 0603| 1| Samsung| CL10A224KB8NNNC
C13, C14| CAP CER 1UF 50V X5R 0603| 2| Samsung| CL10A105KB8NNNC
C15| CAP CER 1000PF 50V X5R 0603| 1| TDK Corporation| C1608X5R1H102K080AA
C16| CAP CER 2200PF 50V X5R 0603| 1| TDK Corporation| C1608X5R1H222K080AA
D2| DIODE SBR 60V 8A POWERDIS| 1| Diodes Incorporated| SBR8U60P5-7
L1| FIXED IND 10UH 9A 23.1 MOHM SMD| 1| Wurth Elektronik| 7443331000
01| MOSFET N-CH 30V 11A 850| 1| Vishay Siliconix| SI4386DY-T1-E3
R1| RES 20K OHM 0603| 1| Yageo| C0603FR-0720KL
R2| RES 7.5K OHM 1% 1/10W 0603| 1| Yageo| RC0603FR-077K5L
R3| RES 39K OHM 1% 1/10W 0603| 1| Yageo| RC0603FR-0739KL
R5| RES 0 OHM JUMPER 1/10W 0603| 1| Yageo| RC06031R-07ORL
R6| RES 100 OHM 1% 1/10W 0603| 1| Yageo| RC0603FR-07100RL
R7| RES 0.005 OHM 1% 1W 1206| 1| Yageo| PAl206FRF470R005L
R8| RES 18K OHM 1% 1/10W 0603| 1| Yageo| RC0603FR-0718KL
R9| RES 560K OHM 1% 1/10W 0603| 1| Yageo| RC0603FR-07560KL
R10| RES 29.4K OHM 1% 1/10W 0603| 1| Yageo| RC0603FR-0729K4L
U1| 3.5V to 60V Input Boost/SEPIC/Flyback DC-DC Controller| 1| Kinetic Technologies| KTC3500EVAC-TB

Important Notices

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MAY 2024 – EUM-0029-01
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