RDK-268 Power Integrations, RDK-268 Datasheet

RDK-268

Manufacturer Part Number

RDK-268

Description

REFERENCE DESIGN LINKSWITCH-PL

Manufacturer

Power Integrations

Series

LinkSwitch®-PLr

Datasheet

1.RDK-268.pdf (20 pages)

Specifications of RDK-268

Mfg Application Notes

LinkSwitch-PL Family AppNote

Design Resources

RDR-268

Current - Output / Channel

366mA

Outputs And Type

1, Non-Isolated

Voltage - Output

2.5 V ~ 3.5 V

Voltage - Input

85 ~ 265VAC

Utilized Ic / Part

LNK454DG

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Features

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Other names

596-1423

Current page: 1 of 20
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LNK454/456-458/460

LinkSwitch-PL Family

LED Driver IC with TRIAC Dimming, Single-Stage PFC and

Constant Current Control for Non-Isolated Applications

Product Highlights

Dramatically Simplifies Off-line LED Drivers

•

Advanced Performance Features

•

Advanced Protection and Safety Features

•

EcoSmart

•

Description

The LinkSwitch-PL family enables a very small and low cost

single-stage power factor corrected constant current driver for

solid state lighting. Optimized for direct LED current sensing, the

LinkSwitch-PL operates over a wide input voltage range

delivering an output power of up to 16 W. The LinkSwitch-PL

control algorithm provides flicker-free TRIAC dimming with minimal

external components.

Each device incorporates a 725 V rated power MOSFET, a novel

discontinuous mode variable frequency variable on-time controller,

frequency jitter, cycle by cycle current limit and hysteretic thermal

shutdown in a monolithic 4-pin IC, available in SO-8C, eSOP-12,

and eDIP-12 packages.

www.powerint.com

Flicker-free phase-controlled TRIAC dimming

Single stage power factor correction and accurate constant

current (CC) output

Very low component count with small non-electrolytic bulk

capacitor for compact replacement lamp designs

Compact SO8, eSOP, and eDIP packages

Completely eliminates control loop compensation

Optimized for non-isolated flyback designs

Frequency jitter greatly reduces EMI filter size and costs

Low dissipation direct sensing of LED current

Cycle skipping regulation for abnormally low output power to

clamp peak output current delivered

725 V integrated power MOSFET allows small bulk capacitance

and maximizes power capability

Short-circuit, overload, open feedback and output overvoltage

protection

Hysteretic thermal shutdown

Meets high-voltage creepage between DRAIN and all other pins

both on PCB and at package

High power factor optimizes system lumen per input VA

Control algorithm balances switching and conduction losses

over line and load to maintain optimum efficiency

™

- Energy Efficient

™

Figure 1.

Output Power Table

Figure 2.

Table 1.

Notes:

1. Maximum practical continuous power in an open frame design with adequate

2. Packages: D: SO-8C, K: eSOP-12, V: eDIP-12.

LNK454D

LNK456D

LNK457D/K/V

LNK458K/V

LNK460K/V

Serial LEDs

heat sinking, measured at +50 °C ambient (see Key Applications Considerations

for more information).

Number of

Product

Output Power Table.

Basic Application Schematic.

Device Selection Based on Length of Output LED Series String and

Current. A Typical Voltage Drop of 3.5 V per LED is Assumed.

LNK454

LNK456

LNK457

LNK458

LNK460

350 mA

Minimum Output

Power

1.5 W

3 W

4 W

6 W

8 W

CONTROL

LinkSwitch-PL

LNK454

LNK456

LNK457

LNK458

LNK460

500 mA

Output Current

85-265 VAC

LNK454

LNK456

LNK457

LNK458

LNK460

700 mA

Maximum Output

Power

11.5 W

16 W

3 W

6 W

8 W

November 2010

PI-5835-060710

1000 mA

LNK456

LNK457

LNK458

LNK460

Related parts for RDK-268

RDK-268 Summary of contents

Page 1

LNK454/456-458/460 LinkSwitch-PL Family ™ LED Driver IC with TRIAC Dimming, Single-Stage PFC and Constant Current Control for Non-Isolated Applications Product Highlights Dramatically Simplifies Off-line LED Drivers Flicker-free phase-controlled TRIAC dimming • Single stage power factor correction and accurate constant • ...

Page 2

LNK454/456-458/460 BYPASS (BP) V FB(SK FB(LO µA FEEDBACK (FB) + Figure 2. Functional Block Diagram. Pin Functional Description DRAIN (D) Pin: High-voltage power MOSFET drain connection. The internal start-up bias current is drawn from ...

Page 3

AC IN Figure 4. Typical Application Schematic. Functional Description The LinkSwitch-PL combines a high-voltage power MOSFET switch with a power supply controller in one device. The IC provides a single stage power factor correction plus LED current control. The LinkSwitch-PL ...

Page 4

LNK454/456-458/460 V FB ϕ FB( ϕ ) 0° V LINE V TRIAC ϕ 0° Phase Conduction Angle Angle Leading Edge TRIAC Dimmers Figure 6. Feedback Voltage vs. Phase Angle Dimming Characteristics. TRIAC (Phase-Controlled) Dimming The LinkSwitch-PL integrates several ...

Page 5

IC Supply and BYPASS Pin The internal 5.85 V regulator charges the bypass capacitor connected to the BYPASS pin to 5. drawing current from the voltage on the DRAIN pin whenever the power MOSFET is off. The BYPASS ...

Page 6

LNK454/456-458/460 LinkSwitch-PL Application Example The circuit shown in Figure 7 provides a single constant current output of 350 mA with an LED string voltage The output current can be reduced using a standard AC mains TRIAC dimmer ...

Page 7

Bleeder Circuit Resistor R10, R11 and C6 form a bleeder network which ensures the initial input current is high enough meet the TRIAC holding current requirement, especially during small conduction angles. For non-dimming application R10, R11 and C6 may be ...

Page 8

LNK454/456-458/460 This can be achieved through selecting the appropriate value of output capacitance and the value of the current sense resistor. If the peak of the ripple voltage exceeds 520 mV, the device will enter cycle skipping mode which will ...

Page 9

Reduce the capacitance value to find the minimum acceptable value. Reducing the capacitance value reduces power dissipation and therefore increases efficiency. If the bleeder circuit does not maintain conduction in the TRIAC, then add a damper. The purpose of the ...

Page 10

LNK454/456-458/460 Secondary Side Connections The output rectifier and output filter capacitor should be as close as possible. The transformer output return pin should have a short trace to the return side of the output filter capacitor. These currents should not ...

Page 11

Absolute Maximum Ratings (1,4) DRAIN Pin Peak Current : LNK454 ............... 400 mA (750 mA) (5) LNK456 ..............850 mA (1450 mA) LNK457 ........... 1350 mA (2000 mA) LNK458 ............1750 mA (2650 mA) LNK460 ............2700 mA (5100 mA) DRAIN Pin Voltage ...

Page 12

LNK454/456-458/460 Parameter Symbol Control Function (cont DRAIN Supply Current CH1 BYPASS Pin Charge Current I CH2 BYPASS Pin Voltage V BP BYPASS Pin V Shunt Voltage SHUNT Circuit Protection Current Limit I LIMIT Leading Edge ...

Page 13

Parameter Symbol Output ON-State Resistance R DS(ON) OFF-State Leakage I DSS1 Breakdown Voltage BV DSS DRAIN Supply Voltage Auto-Restart OFF-Time t AR(OFF) Auto-Restart Duty Cycle DC AR www.powerint.com Conditions SOURCE = -40 to +125 °C J ...

Page 14

LNK454/456-458/460 Typical Performance Characteristics 1000 100 100 200 300 DRAIN Voltage (V) Figure 7. Drain Capacitance vs. Drain Voltage. 1.1 1.0 0.9 -50 - 100 125 150 Junction Temperature (°C) Figure 9. Breakdown ...

Page 15

B 4 4.90 (0.193) BSC 3.90 (0.154) BSC 0.10 (0.004 Pin 1 ID 1.27 (0.050) BSC 1.35 (0.053) 1.25 - 1.65 1.75 (0.069) (0.049 - 0.065) 0.10 (0.004) 0.25 (0.010) Reference Solder Pad ...

Page 16

LNK454/456-458/460 2 0.400 [10.16] Pin #1 I.D. (Laser Marked) 0.059 [1.50] 0.460 [11.68 0.008 [0.20 2X, 6 Lead Tips 0.023 [0.58] 12× 0.018 [0.46] 0.010 (0.25 TOP VIEW 0.098 ...

Page 17

Pin #1 I.D. 0.316 [8.03] (Laser Marked) Ref 0.004 [0.10 0.213 [5.41] 0.350 [8.89 TOP VIEW 0.356 [9.04] Ref. 0.019 [0.48] Ref. H ...

Page 18

LNK454/456-458/460 Part Ordering Information LNK 454 Rev. A 11/01/10 • LinkSwitch Product Family • PL Series Number • Package Identifier D SO-8C K eSOP-12 V eDIP-12 • Package Material G GREEN: Halogen Free and RoHS ...

Page 19

LNK454/456-458/460 19 Rev. A 11/01/10 ...

Page 20

... The products and applications illustrated herein (including transformer construction and circuits external to the products) may be covered by one or more U.S. and foreign patents, or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations patents may be found at www.powerint.com. Power Integrations grants its customers a license under certain patent rights as set forth at http://www ...

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