ISL1902 Datasheet, PDF (1/25 Pages) Intersil Corporation – Full-Featured, Dimmable AC Mains LED Driver with PFC

Full-Featured, Dimmable AC Mains LED Driver with PFC
ISL1902
The ISL1902 is a high-performance, critical conduction mode
(CrCM), single-ended controller used for single-stage
conversion of the AC mains to a constant current source with
power factor correction (PFC). This controller may be used in
virtually any single-ended topology, isolated or non-isolated,
including Boost, SEPIC, Flyback, and Forward converters.
Operation in CrCM allows near zero-voltage switching (ZVS) for
improved efficiency while maximizing magnetic core
utilization.
The ISL1902 is compatible with both leading and trailing edge
modulated AC mains dimmers as well as analog signal and
ambient light sensor controlled dimming methods. The LED
string may be dimmed either by modulation of the DC current
or PWM dimming. In-rush current limiting minimizes current
spikes caused by leading edge dimmers and prevents dimmer
malfunction when one or more LED fixtures are connected.
Two control loops are provided to improve transient response
since one loop must have restricted bandwidth to allow PFC.
The second control loop may be configured for higher
bandwidth to respond to input transients quickly and prevent
them from propagating to the load and appearing as
flashing/flickering.
The ISL1902 LED driver controller provides all of the features
required for high-performance dimmable LED ballast designs.
Applications
• Industrial and commercial LED lighting
• Architectural lighting LED drivers
• AC or DC input LED ballasts
Features
• Excellent LED current regulation over line, load, and
temperature
• 0 - 100% dimming with leading-edge (triac) and
trailing-edge dimmers
• Analog control signal dimming
• Configurable for PWM or DC Current Dimming Control of
LEDs
• Dual control loops for PFC and fast transient response
• Compatible with ambient light sensors for uniform
lamp-to-lamp performance
• Power factor correction for up to 0.995 power factor and
less than 20% harmonic content
• Critical Conduction Mode (CrCM) operation for
quasi-resonant high efficiency performance
• Supports universal AC mains input
• Active pre-load to eliminate power-off “afterglow”
• OFFREF feature sets dimming turn-off-threshold to improve
fixture performance matching
• In-rush protection control for each AC half-cycle minimizes
audible noise and eliminates dimmer resonance
• Input or Output Overvoltage Protection (OVP)
• Over-Temperature Protection (OTP)
• Bias Supply Under Voltage Lockout (UVLO)
• -40°C to +125°C operation
• Pb-free (RoHS compliant)
800
700
600
500
400
300
200
100
0
0
20
40
60
80
100
AC CONDUCTION ANGLE (%)
FIGURE 1. TYPICAL APPLICATION - DIMMING PERFORMANCE
1.00
0.98
0.96
0.94
0.92
0.90
80
130
180
230
INPUT VOLTAGE (V_RMS)
FIGURE 2. TYPICAL APPLICATION - POWER FACTOR
March 20, 2013
1
FN7981.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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