RD8 Datasheet, PDF (1/12 Pages) Power Integrations, Inc. – 85 to 265 VAC Input, 3 W Output Reference Design Board

RD8
®
TinySwitch ^TM
Reference Design Board
85 to 265 VAC Input, 3 W Output
Low Cost Production Worthy AC
Adapter Reference Design
• Cost competitive with linear solutions (regulated 50/
60 Hz transformers)
• Lowest component count switching solution
• Ultra low no-load power consumption (30/70 mW @115/
230 VAC)
• Simple low cost two-winding transformer
• Greater than 72% efficiency
• Low average EMI, only one inductive component
required for EMI filtering
• Small size
Designed for World Wide Operation
• Designed for IEC/UL safety requirements
• Meets FCC/VDE Class B EMI specifications
• Wide range input voltage
Description
The RD8 reference design board is an example of a low cost
production worthy design for an AC wall adapter or similar
applications requiring small size, high efficiency, and low cost.
The RD8 utilizes the TNY254 member of the TinySwitch
family of low cost Off-line Switchers from Power Integrations.
It is intended to help TinySwitch users develop their products
quickly by providing a production ready design which needs
little or no modification to meet system requirements. The RD8
is designed to replace conventional linear AC wall adapters,
offering universal input range, smaller size, and high efficiency,
all at a competitive cost. The RD8 is cost-competitive with
linear solutions (regulated 50/60 Hz transformers).
The unique ON/OFF control scheme of Tinyswitch virtually
eliminates energy consumption at no load. Typical linear wall
adapters consume 1-4 watts at no load, which costs $1-$4 per
year ( based on $0.12/kWhr). In comparison, a typical TinySwitch
supply consumes 30-70 mW at no load, offering substantial
energy savings.
1.30 in.
(33 mm)
1.80 in. (45 mm)
0.80 in.
(20 mm)
PI-2252-091098
Figure 1. RD8 Board Overall Physical Dimensions.
PARAMETER
LIMITS
Input Voltage Range
85 to 265 VAC
Input Frequency Range
47 to 440 Hz
Temperature Range
Output Voltage (I_o = 0.33 A)
Output Power (continuous)
Line Regulation (85-265 VAC)
Load Regulation (0%-100%)
Efficiency (P_O = 3 W)
Standby Power Consumption
(115/230 VAC)
Output Ripple Voltage
0 to 50°C
9 V ± 7%*
3W
± 0.5%
± 1%
72% (min)
30/70 mW (typical)
± 75 mV
Safety
IEC 950 / UL1950
VFG243B (Quasi-Peak)
EMI
VFG46 B (Average)
CISPR22 B
FCC Part 15 "B"
* Can be improved to ± 5% by using a more accurate Zener (± 2%).
Table 1. Table of Key Electrical Parameters.
March 1999