Electronic ballasts maximise convenience and cost-savings

Fairchild Semiconductor has introduced the FAN7710 and FAN7711, two highlyintegrated electronic ballast ICs that save cost and footprint while supporting advanced lamp-control features.

Both devices integrate frequency-control and shunt-regulator circuits as well as a high-side 625V gate driver. The FAN7710 also implements two 550V MOSFETs to deliver a system-in-package solution for Compact Fluorescent Lamp (CFL) applications. The FAN7711 is designed for use with external MOSFETs, giving engineers the flexibility to optimise for Linear Fluorescent Lamp (LFL) applications.

By presenting only two pins for frequency control and time control, compared to the four pins required by conventional devices, the FAN7710 and FAN7711 simplify system design. The FAN7710 is available in the 8-pin Dual Inline Package (DIP-8), while the FAN7711 is available as 8-pin DIP or in the 8-pin Small Outline Package (SOP-8).

Further features include Active Zero Voltage Switching (AZVS), which allows detection of an open-lamp condition without requiring external circuitry. AZVS also increases system stability and reduces stress on MOSFETs. Additional integrated features that enhance performance and reliability include common-mode-noise cancellation to minimise dV/dt-noise intrusion, as well as Undervoltage Lockout (UVLO) and an output buffer for shoot-through prevention.

 

FEATURES 120µA start-up current Adjustable run frequency and preheat time Clamping zener diode High-accuracy oscillator Soft-start function Operating temperature range: -25°C to 125°C

APPLICATIONS CFL ballasts LFL ballasts

 

 

	www.fairchildsemi.com/pf/FA/FAN7710.html
	www.fairchildsemi.com/pf/FA/FAN7711.html