RTQ6341GQW, 42V_IN, 1.5A, Asynchronous Step-Down Converter Evaluation Board

EVB_RTQ6341GQW

ACTIVE

The Evaluation Board demonstrates the RTQ6341GQW to be designed for a 5V/1.5A output from a 8V to 42V input at 500kHz switching frequency. The wide input range makes it suitable for communications and industrial 12V, 24V and 36V power systems. The RTQ6341GQW provides complete protection functions such as input undervoltage lockout, output undervoltage protection, overcurrent protection and thermal shut down. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up.

General Description

Performance Sepcification Summary

Summary of the RTQ6341GQW Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C.

Table 1. RTQ6341GQW Evaluation Board Performance Specification Summary

Specification	Test Conditions	Min	Typ	Max	Unit
Input Voltage Range		8	--	42	V
Output Current		0	--	1.5	A
Default Output Voltage		--	5	--	V
Operation Frequency		--	500	--	kHz
Output Ripple Voltage	I_OUT = 1.5A	--	10	--	mVp-p
Line Regulation	I_OUT = 1.5A, V_IN = 8V to 42V	--	±1	--	%
Load Regulation	V_IN = 12V, I_OUT = 0.001 A to 1.5A	--	±1	--	%
Load Transient Response	I_OUT = 0.75A to 1.5A	--	±5	--	%
Maximum Efficiency	V_IN = 12V, V_OUT = 5V, I_OUT = 1.5A	--	88.9	--	%

Power-up Procedure

Suggestion Required Equipments

RTQ6341GQW Evaluation Board
DC power supply capable of at least 42V and 2A
Electronic load capable of 6A
Function Generator
Oscilloscope

Quick Start Procedures

The Evaluation Board is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on supplies until all connections are made. Note : When measuring the output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip and ground ring directly across the last output capacitor.

Proper measurement equipment setup and follow the procedure below.

1) With power off, connect the input power supply to VIN and GND pins.

2) With power off, connect the electronic load between the VOUT and nearest GND pins.

3) Turn on the power supply at the input. Make sure that the input voltage does not exceeds 42V on the Evaluation Board.

4) Check for the proper output voltage using a voltmeter.

5) Once the proper output voltage is established, adjust the load within the operating ranges and observe the output voltage regulation, ripple voltage, efficiency and other performance.

Detailed Description of Hardware

Headers Description and Placement

Carefully inspect all the components used in the EVB according to the following Bill of Materials table, and then make sure all the components are undamaged and correctly installed. If there is any missing or damaged component, which may occur during transportation, please contact our distributors or e-mail us at evb_service@richtek.com.

Test Points

The EVB is provided with the test points and pin names listed in the table below.

Test Point/ Pin Name	Function
VIN	Input voltage.
VOUT	Output voltage.
GND	Ground.
EN	Enable test point.
J3	EN jumper. Connect EN to ground to disable, open to enable.
SW	Switch node test point.
V2	Test pin V2 is used for bode plot measurement. Connect VOUT pin and this pin to the injection transformer.
SS/TR	Soft-start and tracking test point.
VPG_Ext	Test point for pull up voltage of the Open-drain power-good indication output.
PGOOD	Power-good indication test point.

Bill of Materials

V_IN = 12V, V_OUT = 5.0V, I_OUT = 1.5A, f_SW = 500kHz
Reference	Count	Part Number	Value	Description	Package	Manufacturer
U1	1	RTQ6341GQW	RTQ6341GQW	Step-Down Converter	WDFN-10SL 3x3	RICHTEK
C3, C4	2	HMK316AC7225KLHTE	2.2µF	Capacitor, Ceramic, 100V, X7R	1206	WALSIN
C5	1	0603B182K500CT	1.8nF	Capacitor, Ceramic, 50V, X7R	0603	WALSIN
C6	1	0603N180J500CT	18pF	Capacitor, Ceramic, 50V, NPO	0603	WALSIN
C7	1	GRM32ER61C476KE15L	47µF	Capacitor, Ceramic, 16V, X5R	1210	MURATA
C11	1	0603B104K500CT	0.1µF	Capacitor, Ceramic, 50V, X7R	0603	WALSIN
CBOOT	1	0603B104K500CT	0.1µF	Capacitor, Ceramic, 50V, X7R	0603	WALSIN
CSS	1	0603B103K500CT	10nF	Capacitor, Ceramic, 50V, X7R	0603	WALSIN
D1	1	SS26	60V/2A	Schottky Diode	SMB	ON Semiconductor
L1	1	ETQP3M150KVN	15µH	Inductor, Isat = 5.1A, 99.2mΩ	--	Panasonic
R1	1	WR06X5232FTL	52.3k	Resistor, Chip, 1/10W, 1%	0603	WALSIN
R2, R8	2	WR06X1002FTL	10k	Resistor, Chip, 1/10W, 1%	0603	WALSIN
R3	1	WR06X5602FTL	56k	Resistor, Chip, 1/10W, 1%	0603	RALEC
R7, RBOOT	2	WR06X000 PTL	0	Resistor, Chip, 1/10W, 1%	0603	WALSIN
RT	1	RTT032323FTP	232k	Resistor, Chip, 1/10W, 1%	0603	RALEC

Typical Applications

EVB Schematic Diagram

1. The capacitance values of the input and output capacitors will influence the input and output voltage ripple.

2. MLCC capacitors have degrading capacitance at DC bias voltage, and especially smaller size MLCC capacitors will have much lower capacitance.

Measure Result

Output Ripple Measurement	Load Transient Response

Power On from EN	Power Off from EN

Short Circuit Response – Short and Recovery	Start-Up Dropout Performance

Efficiency vs. Output Current	Output Voltage vs. Output Current

Output Voltage vs. Input Voltage	Loop Response

Thermal Image at V_IN = 12V, V_OUT = 5V, I_OUT = 1.5A

Note: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip directly across the output capacitor.

Evaluation Board Layout

Figure 1 to Figure 4 are RTQ6341GQW Evaluation Board layout. This board size is 70mm x 50mm and is constructed on four-layer PCB, outer layers with 2 oz. Cu and inner layers with 1 oz. Cu.

Figure 1. Top View (1^st layer)

Figure 2. PCB Layout—Inner Side (2^nd Layer)

Figure 3. PCB Layout—Inner Side (3^rd Layer)

Figure 4. Bottom View (4^th Layer)

Title	Last Update	Share
Evaluation Board User Guide	2024/04/18	Email RSS Facebook Google+ twitter Linkedin
Bill of Materials	2024/04/18	Email RSS Facebook Google+ twitter Linkedin
Schematic	2024/04/18	Email RSS Facebook Google+ twitter Linkedin
Gerber File	2024/04/18	Email RSS Facebook Google+ twitter Linkedin

RTQ6341

The RTQ6341 is a 1.5A, high-efficiency, peak current mode control asynchronous step-down converter. The device operates with input voltages from 4V to 42V. The device can program the output voltage between 0.8V to VIN. The low quiescent current design with the integrated low R_DS(ON) of high-side MOSFET achieves high efficiency over the wide load range. The peak current mode control with simple external compensation allows the use of small inductors and results in fast transient response and good loop stability.

The wide switching frequency of 100kHz to 2500kHz allows for efficiency and size optimization when selecting the output filter components. The ultra-low minimum on-time enables constant-frequency operation even at very high step-down ratios. For switching noise sensitive applications, it can be externally synchronized from 300kHz to 2200kHz.

The RTQ6341 provides complete protection functions such as input under-voltage lockout, output under-voltage protection, output over-voltage protection, over-current protection, and thermal shutdown. Cycle-by-cycle current limit provides protection against shorted outputs, and soft-start eliminates input current surge during start-up. The RTQ6341 is available in WDFN-10SL 3x3 and SOP-8 (Exposed pad) packages.

Please confirm with our distributor or sales representative for actual stock status.

RTQ6341GQW, 42VIN, 1.5A, Asynchronous Step-Down Converter Evaluation Board