RT8130BGQW Evaluation Board

Transcription

1 RT830BGQW V High Efficiency Synchronous Buck PWM Controller Purpose The RT830B is a high efficiency single phase synchronous Buck DC/DC controller with 5V/V supply voltage. This document explains the function and use of the RT830B evaluation board (EVB), and provides information to enable operation, modification of the evaluation board and circuit to suit individual requirements. Table of Contents Purpose... Introduction... Key Performance Summary Table... Bench Test Setup Conditions... 3 Schematic, Bill of Materials & Board Layout... 4 More Information... 8 Important Notice for Richtek... 8 EVB_RT830BGJ8F-00 November 05

2 RT830BGQW Introduction General Product Information The RT830B is a high efficiency single phase synchronous Buck DC/DC controller with 5V/V supply voltage. The RT830B has embedded MOSFET gate driver with high driving capability, supporting driving voltage up to V for high output current application. This device uses lossless low-side MOSFET RDS(ON) current sense technique for over-current protection with adjustable threshold set by the LGATE pin (LGOCS). Other features include power good indication, enable/disable control and internal soft-start. The RT830B also provides fault protection functions to protect the power stage output. With above functions, the IC provides customers a cost- effective solution for high efficiency power conversion. The RT830B is available in the WDFN-0L 3x3 package. Product Feature High Light Load Efficiency Single 5V to V Driver Voltage Integrated High Driving Capability N-MOSFET Gate Drivers 300kHz Fixed Frequency Internal Oscillator 85% Maximum PWM Duty Cycle Power Good Indicator Enable/Disable Control Internal Soft-Start Lossless Low-Side MOSFET R DS(ON) Current Sensing for Over-Current Fault Monitoring LGATE Over-Current Setting (LGOCS) Dedicated Output Voltage Monitor OCP, UVP, OVP, OTP, UVLO Key Performance Summary Table Key Features Input Voltage Range Max Output Current Default Output Voltage Default Marking & Package Type Operation Frequency Number : PCB048_V 9V 7A V RT830BGQW, WDFN-0L 3x3 Steady 300kHz at all loads EVB_RT830BGJ8F-00 November 05

3 RT830BGQW Bench Test Setup Conditions Headers Description and Placement Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send to Test Points The EVB is provided with the test points and pin names listed in the table below. Test point/ Pin name VIN Signal Input voltage Comment (expected waveforms or voltage levels on test points) Power input. Support.5V to V Input Voltage. Must bypass with a suitable large ceramic capacitor at this pin. Internal Driver voltage 5V or V bias input supply. Connect a.µf capacitor to ground. GND Ground Ground. BOOT Bootstrap supply test point Bootstrap supply for high-side gate driver. Connect a 0.µF ceramic capacitor between the BOOT and SW pins. PHASE Switch node test point Connect this pin to an external L-C filter. UG LG PGOOD High-Side MOSFET Gate Driver Output Low-Side MOSFET Gate Driver Output Power Good Indicator Output Connect this pin to the Gate of high-side MOSFET for floating drive. Connect this pin to the Gate of low-side MOSFET. This pin is also used for Over-Current Protection (OCP) threshold setting. Connect a resistor (ROCSET) from this pin to the GND pin to set the OCP threshold. This pin provides an open-drain output. Connect this pin to a voltage source through a pull-up resistor. EVB_RT830BGJ8F-00 November

4 D G D G S S D D G G S S your power partner. RT830BGQW Power-up & Measurement Procedure. Connect input power (.5V < VIN < V) to VIN test pin.. Connect positive end and negative terminals of load to VOUT and GND test pins respectively. 3. Connect 5V or V for test pin. 4. Verify the output voltage (approximately V) between VOUT and GND. 5. Connect an external load up to 7A to the VOUT and GND terminals and verify the output voltage and current. Output Voltage Setting Set the output voltage with the resistive divider (R8, R0) between VOUT and GND with the midpoint connected to FB. The output is set by the following formula : R8 VOUT V FB R 0 Schematic, Bill of Materials & Board Layout EVB Schematic Diagram VIN L3 GP VIN=9V uh R6 R7 R8 Z Z Z3 Z4 PAD6 PAD6 PAD6 PAD6 TP3 VIN VOUT J9 4 3 VOUT_GND J3 4 3 VIN J0 4 3 VIN_GND J uF/50V C4 C8 0uF/5V R5 0 C7 0uF/5V C6 0uF/5V C4 C7 000uF/5V 000uF/5V SIRA4DP Q3 R. C.uF/50V C3 8pF R3 LG Q Q Q6 Q7 Q4 SIRA06DP Q9 VOUT JP SIP-P TP6 GP3 GP4 GP5 GND GND GND 3 R5 0 J3 J4 J J R9 0 D N448 A A K K TP4 C5 0uF/5V Q8 R3 0 JP SIP-P Q5 G N700 R4 0K S D GP R 8.K 4.7nF PHASE BOOT LX UG 3 GND COMP/EN GND 5 FB LG 4 R6 0K VOS PGOOD 0 C U RT830B R4 TP7 PGOOD TP8 PHASE TP9 UG R7 0 TP0 LG R 5K UG SIRA06DP R L4 L L Vout=V, Iout=6.8A.4uH C5 C8 C9 C0 C 680uF/6V 0uF/6V 680uF/6V C3.nF C6 R8 R0 K R0 C 4.3K R9 0 C9 C8 C7 C5 C6 C9 C C0 C C4 C3 FK FK FK3 FK4 80pF 3K EVB_RT830BGJ8F-00 November

5 RT830BGQW Bill of Materials Reference Qty Part Number Description Package Manufacture U4 RT830BGQW DC/DC Controller WDFN-0L 3x3 RICHTEK C 06X7R 00nF.µF/50V X7R/06 TDK C 0603X7R 4700nF ±0% 50V 4.7nF X7R/0603 TDK C3 0603NPO 8pF ±5% 50V 8pF NPO/0603 WALSIN C4 C608X7RH04KT000N 0.µF/50V X7R/0603 TDK C5, C6, C7, C8 4 C36X5RH06KT000N 0µF/5V X5R/06 TDK C7, C4 06X7R 00nF ±0% 50V 000µF/5V C9 C0X5RC06KTK0HN 0µF/6V TDK C0, C, C6 470µF/6V C 80pF C0603 WALSIN C3.nF C0603 WALSIN D N448_R_0000 N448 RANJIT L MMD-0DZ-RM-X.µH Mag.Layers Q SIRA4DP VISHAY Q, Q7 SIRA06DP VISHAY Q5 N700 RANJIT R. R0603 R 8.K R0603 R5, R7, R3, R5, R9, R0 6 0 R0603 R6, R4 0K R0603 R8 4.3K R0603 R9 3K R0603 R0 K R0603 R R0603 R 5K R0603 R6, R7, R8 3 0 R0603 EVB_RT830BGJ8F-00 November

6 RT830BGQW PCB Layout Top View ( st layer) PCB Layout Inner Side ( nd Layer) EVB_RT830BGJ8F-00 November

7 RT830BGQW PCB Layout Inner Side (3 rd Layer) Bottom View (4 th Layer) EVB_RT830BGJ8F-00 November

8 RT830BGQW More Information For more information, please find the related datasheet or application notes from Richtek website Important Notice for Richtek THIS DOCUMENT IS FOR REFEREE ONLY, NOTHING CONTAINED IN THIS DOCUMENT SHALL BE CONSTRUED AS RICHTEK S WARRANTY, EXPRESS OR IMPLIED, UNDER CONTRACT, TORT OR STATUTORY, WITH RESPECT TO THE PRESENTATION HEREIN. IN NO EVENT SHALL RICHTEK BE LIABLE TO BUYER OR USER FOR ANY AND ALL DAMAGES ILUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL DAMAGES. EVB_RT830BGJ8F-00 November