Microchip Technology CL88020T-E/SE

Overview

CL88020T-E/SE from Microchip Technology is a sequential linear LED driver IC optimized for 120 VAC ±15% input, delivering 8.5W output power to long LED strings via four regulated current taps. It features programmable overtemperature protection with gradual light reduction, active line regulation (–12% to +0% line regulation), and supports TRIAC dimmer compatibility in thermally enhanced 8-lead SOIC with exposed thermal pad.

For engineers reviewing the CL88020T-E/SE datasheet, CL88020T-E/SE pinout, CL88020T-E/SE application, or CL88020T-E/SE equivalent, key selection considerations include tap current ratios (KTAP1 = 0.571, KTAP2 = 0.786, KTAP3 = 0.929), self-commutation ΔVCS(REG) ≤10 mV per transition, OTP threshold at 10.60 mA typical, and ALR-based line regulation requiring external RC network.

Technical Context

The CL88020T-E/SE implements single-point current control using one shared sense resistor (CS) and four sequentially activated linear regulators - each with dedicated reference voltage (VREF4 > VREF3 > VREF2 > VREF1) - enabling smooth self-commutation without external timing or voltage coordination. Its architecture inherently sequences TAP1–TAP4 based on rectified AC voltage rise/fall, eliminating need for clock or microcontroller.

Active Line Regulation (ALR) adjusts the OTP limiting voltage in response to average ALR-pin voltage (target 1.275 V at 120 VAC), indirectly regulating output power across line variations; Overtemperature Protection (OTP) uses external NTC in full-bridge configuration to linearly derate TAP currents starting at 10.60 mA OTP limit, with clamped VREF4 output (1.275 V → 0.255 V) over 85°C–110°C range.

Key Specifications

Pinout & Package

CL88020T-E/SE is housed in an 8-lead SOIC package with 3.30 × 2.41 mm exposed thermal pad (EP), providing enhanced thermal dissipation and larger creepage distances between HV and LV pins for safety compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar sequential linear LED driver applications.

Compared with CL88021T-E/SE, CL88020T-E/SE offers tighter thermal derating control at lower power; versus NCP3065DR2G, it eliminates magnetics and EMI filtering but trades off universal input support and peak efficiency - making CL88020T-E/SE optimal for cost-sensitive, 120 VAC-only LED lamp designs.

Availability

CL88020T-E/SE is available at Aetrix Electronics and suitable for LED retrofit lamps, downlight fixtures, and dimmable LED tubes requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for CL88020T-E/SE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS 16949-certified global operations.

The CL88020T-E/SE belongs to Microchip's sequential linear LED driver product line, designed specifically for low-cost, high-reliability AC-direct LED lighting where simplicity, safety, and thermal robustness outweigh switching efficiency requirements.

FAQ

What is the primary function of the CL88020T-E/SE in an LED lighting system?

The CL88020T-E/SE serves as a sequential linear LED driver IC that regulates current across four taps to drive long strings of low-current LEDs directly from 120 VAC mains. Unlike switching drivers, it achieves 8.5W output without inductors or transformers, relying on self-commutation and single-point current sensing. Its design eliminates EMI filters and bulk capacitors, making CL88020T-E/SE ideal for compact, cost-sensitive LED lamp replacements where thermal management and dimmer compatibility are critical.

How does the CL88020T-E/SE implement active line regulation without closed-loop feedback?

The CL88020T-E/SE implements active line regulation (ALR) by monitoring rectified AC voltage via an external RC divider connected to the ALR pin. This voltage - targeted at 1.275 V at nominal 120 VAC - adjusts the internal OTP limiting voltage, which in turn scales all TAP current references. Since the OTP circuit sets the upper bound for VREF4, ALR indirectly modulates output power across line variations. This open-loop method avoids complex sensing and compensation circuits while achieving –12% to +0% line regulation, a key feature of the CL88020T-E/SE.

Can the CL88020T-E/SE be used with 230 VAC input?

No, the CL88020T-E/SE is explicitly optimized for 120 VAC ±15% nominal input and is not rated for 230 VAC operation. Its absolute maximum TAP-to-GND rating is +352 V, which aligns with peak voltage of 120 VAC (≈170 V), not 230 VAC (≈325 V). Attempting 230 VAC use risks exceeding voltage limits on TAP pins and may cause premature failure. For universal-input designs, alternative solutions like the NCP3065DR2G - though architecturally different - must be evaluated instead of CL88020T-E/SE.

What is the role of the exposed thermal pad in the CL88020T-E/SE SOIC package?

The exposed thermal pad (EP) in the CL88020T-E/SE's 8-lead SOIC package provides a low-thermal-resistance path (θJC = +8°C/W) from the die to the PCB copper, enabling efficient heat dissipation in thermally constrained LED fixtures. It must be soldered to a large, thermally vias-connected copper pour to maintain junction temperature within –40°C to +125°C operating range. This feature distinguishes CL88020T-E/SE from standard SOIC packages and is essential for sustaining 8.5W continuous output in enclosed luminaires without external heatsinks.

How does the CL88020T-E/SE achieve TRIAC dimmer compatibility?

The CL88020T-E/SE achieves TRIAC dimmer compatibility through its inherent current-sinking behavior and fast self-commutation response. As the TRIAC cuts phase angle, the IC's sequential tap activation naturally follows the rising and falling edges of the rectified sine wave, avoiding hold-on issues common in capacitive-input drivers. Its low quiescent current (550 μA typ) and absence of large input capacitors prevent misfiring, while ALR ensures consistent dimming curve across line voltage variations - all core behaviors engineered into the CL88020T-E/SE architecture.