CL88030/31
Sequential Linear LED Driver with Four or Six Taps
Features
• Suitable for 120VAC/230VAC/277VAC Nominal
Input Voltage
- ± 15% input voltage tolerance recommended
• Targeted for 2W and Greater Output Power
• Programmable Overtemperature Protection
- Provides gradual reduction in light output with
increasing temperature
• Active Line Regulation
- Provides fairly constant output power over
variations in AC line voltage
- Adjustable “knee” of regulation
• 4 Taps(CL88030) or 6 Taps(CL88031) with Two
Current Set Resistors
- Allows optimization of THD
• Optional Reduced Flicker Index
- Provides near-continuous power to the LEDs
- Reduces strobing
- Uses an external capacitor
• Compatible with Phase-cut Dimming, both Lead-
ing-edge and Trailing-edge
• Uses a Thermally Enhanced DFN-10 Package
with Bottom Heatslug
- No high voltage Pins
- Shunt regulator input
- Power dissipation is in the external FETs and
LEDs, not in the IC
Applications
• LED lamps
• LED lighting fixtures
Description
The CL88030T and CL88031T LED Driver Integrated
Circuits (ICs) are intended offline sequential linear LED
drivers designed to provide LED power from a utility
voltage input.
The CL88030/31 devices are designed to drive a long
string of inexpensive, low-current LEDs directly from
the AC mains. A basic driver circuit consists of Micro-
chip’s CL88030/31 LED driver IC, four power FETs (six
if using the CL88031), four resistors, two capacitors,
and a bridge rectifier. Additional components are
optional for various levels of transient protection. Add-
ing an inexpensive NTC-thermistor assures over tem-
perature protection (OTP). No EMI filters or power
factor correction circuits are needed (unless the
optional flicker-reduction feature is desired).
A string of series/parallel LEDs is tapped at four (or six)
locations, called “taps”. Linear current regulators sink
current at each tap through a single control point and
are sequentially turned on and off. High efficiency is
achieved by shutting off upstream regulators when
downstream regulators achieve regulation. This makes
controlling overall input current easier than trying to
control multiple current paths by tracking the input sine
wave voltage.
The CL88030/31 uses a self-commutation technique
using only the tap currents themselves; this technique
inherently provides smooth transitions from one
regulator to the next, without relying on tap voltages or
the rectified AC to coordinate the transitions.
Pin Diagram
CL88030T
3 x 3 DFN*
GT1 1
GT2 2
GT3 3
GT4 4
NC 5
10 ALR
9 BIAS
EP
11
8 OTP
7 CS
6 NC
CL88031T
3 x 3 DFN*
GT1 1
GT2 2
GT3 3
GT4 4
GT5 5
10 ALR
9 BIAS
EP
11
8 OTP
7 CS
6 GT6
* Includes Exposed Thermal Pad (EP); see Table 2-1
2018 Microchip Technology Inc.
DS20006049A-page 1
