POWER RD9 Datasheet

RD9

TM

TinySwitch

Flyback Prototyping Board

User Configurable Input and Output Voltages

Product Highlights

Unpopulated Prototyping Board

• Complete layout for construction of TinySwitch flyback
supply

• Convenient prototyping area on secondary side of board

• Single-sided construction

• RD9 boards can be combined for rapid prototyping with
RD8 (available separately)

3.86 in. (97.9 mm)

Figure 1. RD9 Board Overall Physical Dimensions.

POWER

INTEGRATI ONS, INC

TinySwitch

RD9 Rev. B

®

®

.

1.31 in.

(33.2 mm)

PI-2313-0092398

Description

The RD9 is a special printed circuit board (Figure 1) designed
for rapid prototyping of TinySwitch-based flyback power
supplies in the 1-3 W range. Component positions and an
optimized layout are provided for a complete single output
power supply as shown in Figure 2. Component size and
placement are identical to evaluation board RD8. The board is
designed to accommodate a transformer using an EE16 core
with a 10 pin bobbin (Ying Chin YC-1607 or equivalent*). In
addition to the power supply circuitry, the RD9 also provides a
prototyping area on the secondary side of the board for circuitry
such as additional outputs or voltage and current regulators.
Some typical application circuits that can be constructed using
the RD9 printed circuit board can be found in the TinySwitch
and RD8 data sheets, and Design Ideas DI-4 through DI-8.

For extremely rapid prototyping, the RD8 TinySwitch evaluation
board and the RD9 prototyping board are perforated between
the primary and secondary circuit areas, so that the primary half
of the RD8 can be separated and combined with the secondary
half of the RD9.

D1

R1

L

D3

C2
D4

N

U1

C4

C1

D2

L1

R2

R4

C3

U2

T1

C6

EE16_10P2

L2

JMP1

C5

+

C7

VR1

[Not Actual Size]

TinySwitch

Figure 2. PC Board Layout of the RD9.

POWER

INTEGRA TIONS, INC

RD9 Rev. B

PI-2319-100898

®

.

* Available from B&B Products Corp [phone]

September 1998

RD9

L1

AC

D1

R1

Fusible

D2

C1

R2

R4

C2

Input

C3

D3

D4

Figure 3. Schematic Diagram of a Typical RD9 Circuit.

3

4

TinySwitch

D

EN
BP

U1

S

T1

8-10

5-7

C4

D5

U2

C6

L2

Bead

Output

C7

RTN

VR1

C5

PI-2315-092298

Using RD8 and RD9 Together

A complete RD9 board is shown in Figure 4, and an RD8 board
in Figure 5. To combine the secondary side of RD9 with the
primary side of RD8, follow the instructions below:

Figure 4. RD9 Printed Circuit Board.

A

2

9/98

Figure 5. RD8 Printed Circuit Board.