9W high power factor LED driver evaluation board NCL32073LED1GEVB main features and indicators introduced

On Semi's NCL30073 is a highly integrated current mode PWM controller with a supply voltage of up to 24V, a fixed frequency of 65kHz switching frequency, and automatic recovery protection: OVP, OIP, OTP and short circuit. Power factor greater than 0.9, EPS 2.0 compatible, Mainly used in dimming improved and low power fixed device LED applications, phase-controlled dimming compatible LE or LED types, supporting a variety of topologies such as buck, buck boost and flyback converter. This article introduces NCL30073 main Features, internal circuit architecture diagram, application circuit and 9W high power factor LED driver evaluation board NCL32073LED1GEVB main features and indicators, circuit diagram, bill of materials and PCB design.

The NCL30073 is a highly integrated PWM controller capable ofdelivering a rugged and high performance LED converter in a TInyTSOP−6 package. With a supply range up to 24 V, the controller hostsa 65 kHz switching circuitry operated in peak current mode control.When the voltage On FB pin decreases, the controller enters skip cyclewhile limiTIng the peak current.

Over Power ProtecTIon (OPP) is a difficult exercise especially when no-load standby requirements drive the converter specificaTIons. The ON proprietary integrated OPP lets you harness the maximum delivered power without affecting your standby performance simplyvia two external resistors. An Over Voltage Protection is alsocombined on the same Pin but also on the VCC line. They offer an efficient protection in case of adverse open loop operation.

Finally, a timer−based short−circuit protection offers the best protection scheme, letting you procurement select the protection trip pointwithout caring of a loose coupling between the auxiliary and the powerwindings.

Main features of NCL30073:

• Fixed−frequency 65 kHz Current−mode Control Operation
• Internal and Adjustable Over Power Protection (OPP) Circuit
• Internal Ramp Compensation
• Internally Fixed 4 ms Soft−start
• 115 ms Timer−based Auto−recovery Short−circuit Protection
• Protection − Autorecovery
♦ OVP by VCC
♦ OIP
♦ OTP − Foldback
♦ Short Circuit
• Up to 24 V VCC Operation
• Extremely Low No−load Standby Power
• Isolated and Non−isolated Outputs
• Good Regulation – 5%
• High Power Factor > 0.9
• Single Winding Inductor
• Low Parts Count
• EPS 2.0 Compliant
• Pb−Free Devices
• +300 mA / −500 mA Source/Sink Drive Capability

Typical application of NCL30073:

• Dimmable Retrofit and Low Power Fixture LED Applications
• Phase Cut Dimmer Compatible – LE or TE Types
• Multiple Topology Support
♦ Buck
♦ Buck Boost
♦ Flyback

Figure 1. Internal circuit diagram of NCL30073

Figure 2. NCL30073 non-isolated (buck-boost) application circuit diagram

Figure 3. NCL30073 isolation (flyback) application circuit diagram

Evaluation Board NCL32073LED1GEVB: 9W High Power Factor LED Driver

This manual covers the specification, theory of operation, testing and construction of the NCL32073LED1GEVB demonstration board. The NCL32073 board demonstrates a 9 W high PF buck boost LED driver for a typical retrofit application.

Evaluation board NCL32073LED1GEVB main features:

• Low Parts Count
• TRIAC Dimmer compatible
• High Power Factor
• Integrated Fault Protection o Over Temperature on board (a PCB mounted PTC)
o Output Over Current
o Output Over Voltage
Evaluation board NCL32073LED1GEVB main indicators:

Figure 4. Outline Board NCL32073LED1GEVB Outline Drawing

Figure 5. Evaluation board NCL32073LED1GEVB circuit diagram (1)

Figure 6. Evaluation board NCL32073LED1GEVB circuit diagram (2)
Evaluation Board NCL32073LED1GEVB Material List:

Figure 7. Evaluation Board NCL32073LED1GEVB PCB Design (T)

Figure 8. Evaluation Board NCL32073LED1GEVB PCB Design (B)

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