RDK-189 Power Integrations, RDK-189 Datasheet - Page 16

• Manufacturer Part Number: RDK-189
• Description: KIT REF DESIGN FOR PLC810
• Manufacturer: Power Integrations
• Series: HiperPLC™r

Specifications of RDK-189

• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 4, Isolated
• Power - Output: 225W
• Voltage - Output: 24V, 12V, 5V, 5V
• Current - Output: 7A, 4A, 1.9A, 100mA
• Voltage - Input: 90 ~ 265VAC
• Regulator Topology: Flyback
• Board Type: Fully Populated
• Utilized Ic / Part: PLC810
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Switching: -
• Other names: 596-1265

Figure 11. Gate Drive and Feedback PCB Layout Recommendations.
mounted far away from the IC. The 2 traces from the optocoupler
(emitter and collector), should be run side by side to the FBL
circuitry. This minimizes loop area and limits stray di/dt
(inductive) noise coupling.
GATEL and GNDL
See Figure 11. The lines from GATEL pin, and the GNDL pins,
which go to the LLC low side MOSFET Gate and Source
respectively, should run side by side. The GNDL pin should be
connected to the LLC low MOSFET Source pin via a ferrite
bead. The gate resistor (R28) should also be mounted close to
the MOSFET.
HB and GATEH
Refer to Figure 11. The HB and GATEH lines should run side by
side from the LLC high side MOSFET to the PLC810PG. The
gate resistor (R26) should be mounted close to the MOSFET.
Rev. F 08/09
traces side-by-side GNDL and GATEL
HiperPLC
HB and GATEH
16
PLC810PG
traces side-by-side
near HiperPLC
FBL pin parts
Recommended PFC Gate Drive Circuit
Figure 13 shows the recommended PFC MOSFET gate drive
circuit. This circuit needs to be placed close to the PFC
MOSFET. The gate turn-off current is limited by R33, while gate
turn-on current is limited by the sum of the values of R33 and
R4. Resistor R4 also prevents high shoot-through currents
flowing through both BJTs during switching edges. The resistor
R4 is placed in series with the collector of Q8 instead of the
emitter, as this will prevent negative Vbe voltage in Q8 which
can lead to break down of the junction. Resistors R3 and R4
have a strong effect on PFC efficiency, and EMI. The local 1 mF
bypass capacitor, C28, needs to be mounted close to the BJTs
(Q8 and Q9). Resistor R107 is for keeping the MOSFET off
when the PLC810PG is unpowered.
Route opto traces side-by-side
all the way to HiperPLC
R15
Gate resistors
next to LLC
MOSFETs
www.powerint.com
PI-5281-111308