R16UZ0016EU0102 Rev.1.2
Page 3
Jul 28, 2021
RTKA223012DR0050BU, RTKA223012DR0060BU Demonstration Board Manual
1. Functional Description
The RTKA223012DR0050BU and RTKA223012DR0060BU are high-side float-switching buck regulators when
JP1 is on Pin 1 and Pin 2, and can be configured to a Buck/Boost converter when JP1 is on Pin 2 and Pin3, as
shown on the schematic and connection diagram (
and
). Its input has D1 and D6 as a low-cost
rectification (with optional full-bridge rectifier footprint). FR is a 1W fusible resistor providing input overcurrent
protection and inrush current limiting. It also helps to absorb the input line surge energy together with DC buffer
caps, C1 and C2.
C1, L1, and C2 consists of the input filter that provides the energy buffer after rectification and reduces conducted
EMI noises to the input. L2, D,2 and COUT are the buck converter components. RFB1, RFB2, CFB2, and CFB1
provide the output feedback signal to the IC. D4 and R2 provide V
CC
biasing current after startup to increase the
efficiency. They can be optional for low-cost low power applications. C
VCC
is the IC supply capacitor.
1.1
Recommended Equipment
▪ AC Power supply capable of generating AC voltage from 85V
AC
to 265V
AC
at 60Hz/50Hz, with at least 100mA
output current capability.
▪ Load resistor box with adjustable value of 33Ω and up, or an electronics load that can emulate a resistor load or
current load up to 150mA.
▪ Multimeters to measure the output voltage and current.
▪ Power meter to measure the AC input power.
1.2
Setup and Configuration
▪ Program the AC power supply with a voltage between 85V
AC
and 265V
AC
at the corresponding frequency of
60Hz or 50Hz.
▪ While the AC power supply is off, connect the output cables of the AC power supply to the L and N terminal of
the RTKA223012DR0050BU (or RTKA223012DR0060BU). An optional power meter can be added in between
the AC power supply output and the input of the board.
▪ Connect the load to the output terminals VOUT+ and VOUT-.
▪ Connect a voltage meter to VOUT+ and VOUT-, and connect a current meter between board outputs and the
load.
▪ Turn on the AC power supply.
Figure 1. RTKA223012DR0050BU/RTKA223012DR0060BU Connection Diagram
