CAP300DG

CAPZero™-3

Zero1 Loss Automatic X Capacitor Rapid Discharge IC

with Optional Lossless Zero Crossing Signal Generator

www.power.com

November 2021

This Product is Covered by Patents and/or Pending Patent Applications.

Component Table

Product3

BV

DSS

Total

X Capacitance

Total Series

Resistance2

(R1 + R2)

CAP300DG

1000 V

200 nF to 6 mF

54 kW Minimum

Table 1.

Component Table.

Notes:

1. IEC 62301 clause 4.5 rounds standby power use below 5 mW to zero.

2. Values are nominal. RC time constant is <1 second.

3. Packages: D: SO-8.

Product Highlights

• Provides lossless ZC (Zero Crossing) signal to system MCU

• Meets IEC 60335 X capacitor discharge of <34 V in <1 sec

• One part to cover X capacitor values up to 6 mF

• Blocks current through X capacitor discharge resistors when AC

voltage is connected

• Automatically discharges X capacitors through discharge resistors

when AC is disconnected

• Simplifies EMI filter design – larger X capacitor allows smaller

inductive components with no change in consumption

• Only two terminals – meets safety standards for use before or after

system input fuse

• >4 mm creepage on package and PCB

• Self supplied – no external bias required

• High common mode surge immunity – no external ground connection

• High differential surge withstand – 1000 V internal MOSFETs

• NEMKO and CB certification

EcoSmart™– Energy Efficient

• <5 mW consumption at 230 VAC for all X capacitor values

Applications

• All AC-DC converters with X capacitors of 100 nF up to 6 mF

• Appliances requiring ErP Lot 6 compliance

• Adapters requiring ultra low no-load consumption

• All converters requiring very low standby power

• Lossless generation of zero crossing signal

Description

When AC voltage is applied, CAP300DG blocks current flow in the

X capacitor safety discharge resistors, reducing the power loss to less

than 5 mW, or essentially zero1 at 230 VAC. When AC voltage is

disconnected, CAP300DG automatically discharges the X capacitor by

connecting the series discharge resistors. This operation allows total

flexibility in the choice of the X capacitor to optimize differential mode

EMI filtering and reduce inductor costs, with no change in power

consumption.

Designing with CAP300DG is simply a matter of selecting the appropri-

ate external resistor values for the X capacitor value being used to

achieve the necessary time constant. The simplicity and ruggedness of

the two terminal CAP300DG IC makes it an ideal choice in systems

designed to meet ErP Lot 6 requirements.

Figure 1. Typical Application – Not a Simplified Circuit.

Figure 3. SO-8 D Package.

Figure 2. With Added Lossless ZC Output Signal (Non-Isolated System Example

Shown). See DER-320 Design Report for Implementation Details of

Other Configurations.

PI-7507a-030819

D1

R1

AC

R2

X Capacitor

CAP300DG

D2

MOV

and Other

EMI Filter

Components

PI-9394-052521

D1

R1

AC

R2

ZV

X Capacitor

ZVS

CAP300DG

D2

EMI & ACDC

Converter

MCU

Other

Loads