Renesas RAA223021 User manual

Evaluation Board Manual

X0119846 Rev.1.1 Page 1

The RAA223021 evaluation board

(RTKA223021DE0000BU) is a high voltage buck

converter that demonstrates a low-cost high

performance non-isolated AC/DC conversion from an

universal input of 85VAC to 265VAC, to a 12V output

with the output current up to 667mA.

The board has built-in overcurrent, short-circuit, input

brownout, and over-temperature protection, and is

designed on a single side PCB with a full-wave input

rectification. It is pre-compliant with conducted EMI

requirements by EN55022/CISPR 22.

RTKA223021DE0000BU uses the RAA223021

SOIC-7 packaged IC.

Features

▪Universal input

▪Single side PCB with low-cost external components

▪EMI compliance for EN55022/CISPR22

▪Standby power less than 20mW

▪No audible noise

Specifications

This board is optimized for the following operating

conditions:

• Input voltage: 85VAC ~ 265VAC

• Output voltage: 12VDC

• Output current: 667mA max

• Output power: 8W

• Efficiency: >77% at 100% load; 80% at 50% load

• No-load power: 14mW at 120VAC; 16mW at 230VAC

• Load regulation: ±2.4%, load range 10% to 100%

• Operating temperature: -40~85°C

• Board dimension: 40mm x 60mm.

Figure 1. RTKA223021DE0000BU Block Diagram

VOUT

SOURCE

VCC

DRAIN

RAA223021

SOURCE

VCC

FB2

FB1

FB2

FB1

OUT

85V

~265V

Table 1. HV Buck of 021 Power Derating at 85°C Ambient Temperature

Output Setting Voltage (V) 120VAC 230VAC 90VAC~265VAC

3.3 0.67A 0.58A 0.56A

5 0.67A 0.66A 0.6A

9 0.64A 0.6A 0.56A

12 0.56A 0.54A 0.5A

15 0.56A 0.52A 0.5A

24 0.49A 0.5A 0.46A

RTKA223021DE0000BU

X0119846 Rev.1.1 Page 2

May 26, 2021

RTKA223021DE0000BU Evaluation Board Manual

Table 2. Component Selection Guide

VOUT (V) CFB1 (nF) RFB1 (kΩ)R

FB2 (kΩ) L2 (H) R2 (kΩ)R1(kΩ)

24 100 397 45 1m 30 100

15 100 397 76.5 1m 10 47

12 47 397 98.8 680µ 10 47

9 100 397 142 470µ 5.1 47

5 200 100 82 330µ 100 10

3.3 200 100 180 330µ NC 3

X0119846 Rev.1.1 Page 3

May 26, 2021

RTKA223021DE0000BU Evaluation Board Manual

Contents

1. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1 Recommended Equipment and Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2 Setup and Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2. Board Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1 Layout Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2 Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.3 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3. Typical Performance Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4. EMI Test Result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

6. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

X0119846 Rev.1.1 Page 4

May 26, 2021

RTKA223021DE0000BU Evaluation Board Manual

1. Functional Description

The RTKA223021DE0000BU is a buck regulator implemented with a high-side float-switching topology, with

switching frequency up to 43kHz. D1 is a full bridge rectifier on the input end. FR is a 1A fuse providing input

overcurrent protection. As an option, you can replace the standard fuse with a fusible resistor instead to limit

inrush current.

C1, L1, and C2 consist of the input filter that provides the energy buffer after rectification and reduces conducted

EMI noises to the input. L2, D2, and COUT are the buck converter components. RFB1, RFB2, CFB2, and CFB1

provide the output feedback signal to the IC. D4 and R2 provide VCC biasing current after startup to increase the

efficiency. They can be optional for low-cost low power applications. CVCC is the IC supply capacitor.

1.1 Recommended Equipment and Operating Range

▪AC Power supply capable of generating AC voltage from 85VAC to 265VAC at 60Hz/50Hz, with at least 100mA

output current capability.

▪Load resistor box with adjustable value of 18Ωand up, or an electronics load that can emulate a resistor load or

current load up to 667mA.

▪Multi-meters to measure the output voltage and current.

▪Power meter to measure the AC input power.

1.2 Setup and Configuration

1. Program the AC power supply with a voltage between 85VAC and 265VAC at the corresponding frequency of

60Hz or 50Hz.

2. While the AC power supply is off, connect the output cables of the AC power supply to the L and N terminal of

the RTKA223021DE0000BU. An optional power meter can be added in between the AC power supply output

and the input of the board.

3. Connect the load to the output terminals VOUT and GND.

4. Connect a voltage meter to VOUT and GND and connect a current meter between board outputs and the load.

5. Turn on the AC power supply.

Figure 2. Proper Probe Setup to Measure Output Ripple

Output Capacitor

X0119846 Rev.1.1 Page 5

May 26, 2021

RTKA223021DE0000BU Evaluation Board Manual

2. Board Design

Figure 3. Proper Test Setup

Figure 4. RTKA223021DE0000BU Evaluation Board (Top)

Power

Meter

RLoad

85V

~265V

X0119846 Rev.1.1 Page 6

May 26, 2021

RTKA223021DE0000BU Evaluation Board Manual

2.1 Layout Guidelines

Proper layout is important to ensure a stable operation, good thermal behavior, EMI performance and reliable

operation for various operating environments. Please pay attention to the following layout recommendations.

▪Leave proper spacing (minimum1.4mm) between high voltage (max 400V) traces and low voltage traces.

▪Keep a small loop from input filter capacitor to IC, switching inductor, output capacitor and to the ground of input

capacitor.

▪Keep a small loop consisted of switching inductor, output capacitor and freewheeling diode.

▪Keep a small loop consisted of input filter capacitor to IC and freewheeling diode.

▪Keep sufficient copper area on the IC drain and/or source pin (not less than 140mm2 for 6-8W output power) for

better thermal performance.

▪Keep the switching inductor away from the input EMI inductor to avoid noise coupling, especially when an

unshielded switching inductor is used.

▪Keep a small loop from input filter capacitor to IC, sample hold circuit, output capacitor and to the ground of

input capacitor.

▪Place the VCC decoupling cap and FB pin decoupling cap close to the pins.

Figure 5. RTKA223021DE0000BU Evaluation Board (Bottom)

X0119846 Rev.1.1 Page 7

May 26, 2021

RTKA223021DE0000BU Evaluation Board Manual

2.2 Schematic Diagrams

Figure 6. Schematic

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X0119846 Rev.1.1 Page 8

May 26, 2021

RTKA223021DE0000BU Evaluation Board Manual

2.3 Bill of Materials

Qty

Reference

Designator Description Manufacturer Manufacturer Part

1 C2 CAP CER 0.1µF 50V C0G 1206 TDK CGA5L2C0G1H104J160AA

1 C3 CAP CER 1µF 25V X7R 1206 TDK CGJ5L2X7R1E105K160AA

1 C4 CAP CER 0.47µF 50V X7R 1206 TDK C3216X7R1H474K160AA

1 C5 CAP CER 2200pF 50V X7R 0603 TDK CGA3E2X7R1H222K080AA

2 C6 CAP ALUM 10µF 20% 400V RADIAL WE 860021375011

C7 CAP ALUM 10µF 20% 400V RADIAL WE 860021375011

1 C8 CAP ALUM POLY 330µF 20% 35V

T/H

Panasonic 35SEK330M

1 C9 CAP CER 10µF 25V X7R 1206 TDK C3216X7R1E106K160AB

1 C10 CAP CER 680pF 50V C0G 0603 TDK CGA3E2C0G1H681J080AA

1 D1 BRIDGE RECT 1P 600V 500mA

MBM

N/A MB6M

1 D2 DIODE GEN PURP 600V 2A SMC ST STTH2R06S

2 D3 DIODE GEN PURP 600V 1A SMA ST STTH1R06A

D4 DIODE GEN PURP 600V 1A SMA ST STTH1R06A

1 F1 FUSE BOARD MNT 1A 250VAC

RADIAL

Eaton - Electronics Division SS-5-1A

1 IC1 700V, 8W AC/DC Buck Regulator Renesas RAA223021

1 L1 FIXED IND 220µH 500MA 1.2ΩTH WE 7447462221

1 L2 FIXED IND 680µH 900MA 790mΩWE 7447480681

1 R1 RES 397kΩ1% 1/10W 0603 KOA RN73H1JTTD3973F25

1R2 RES98.8kΩ1% 1/10W 0603 KOA RN73R1JTTD9882F25

1R3 RESSMD10kΩ5% 1/10W 0603 Panasonic ERJ-3GEYJ103V

1R4 RESSMD47kΩ5% 1/10W 0603 Yageo RC0603JR-0747KL

1 R5 RES 0 OHM JUMPER 1/4W 1206 Stackpole Electronics Inc RMCF1206ZT0R00

1R6 RESSMD50Ω0.1% 1/10W 0603 Yageo RT0603BRE0750RL

7 TP CONN-DBL TURRET, TH,

0.109LENGTH, BRASS/TIN, ROHS

Keystone Electronics 1514-2

X0119846 Rev.1.1 Page 9

May 26, 2021

RTKA223021DE0000BU Evaluation Board Manual

2.4 Board Layout

Figure 7. Top Layer

Figure 8. Bottom Layer

X0119846 Rev.1.1 Page 10

May 26, 2021

RTKA223021DE0000BU Evaluation Board Manual

3. Typical Performance Graphs

VOUT = 12V, unless otherwise noted.

Figure 9. Efficiency Figure 10. Load Regulation

Figure 11. No Load Power Loss Figure 12. 12V Output Power Derating

Figure 13. 3.3V Output Power Derating Figure 14. 5V Output Power Derating

0 100 200 300 400 500 600

Efficiency (%)

Load Current (mA)

230Vac

120Vac

11.6

11.8

12.0

12.2

12.4

12.6

12.8

13.0

13.2

13.4

0 100 200 300 400 500 600

700

Output Voltage (V)

Load Current (mA)

120Vac

230Vac

75 125 175 225

275

PIN_STBY (mW)

VIN_AC (V)

0.50

0.52

0.54

0.56

0.58

0.60

0.62

0.64

0.66

0.68

45 55 65 75

Load Current (A)

Ambient Temperature (°C)

230Vac 120Vac

265Vac 90Vac

0.50

0.52

0.54

0.56

0.58

0.60

0.62

0.64

0.66

0.68

45 55 65 75

Load Current (A)

Ambient Temperature (°C)

230Vac 120Vac

265Vac 90Vac

0.53

0.58

0.63

0.68

0.73

45 55 65 75

Load Current (A)

Ambient Temperature (°C)

230Vac 120Vac

265Vac 90Vac

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