L6566BHTR - Multimode SMPS PWM Controller, 16-SO | STMicroelectronics
MPN: L6566BHTR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.4 | $2.40 |
| 10 | $2.16 | $21.60 |
| 100 | $1.92 | $192.00 |
| 500 | $1.68 | $840.00 |
| 1,000 | $1.44 | $1,440.00 |
L6566BHTR Overview
A primary-side SMPS controller (PWM controller) is the analog brain of an isolated switching power supply. It senses output voltage and primary current, generates the duty-cycle command for the external high-voltage MOSFET, and orchestrates soft-start, frequency modulation, and fault shutdown. Primary controllers sit hierarchically inside AC-DC converters -> offline switchers -> switch-mode power supply (SMPS) ICs -> power management semiconductors, and are commonly described using synonyms such as "current-mode PWM controller", "quasi-resonant controller", or "flyback controller".
The L6566BH features multimode operation: at light load the IC enters valley-skipping quasi-resonant mode to minimise switching losses and EMI; at heavier load it transitions to fixed-frequency CCM/DCM. Advanced light-load management, 800 V high-voltage start-up, low quiescent current of 3 mA, and 750 mW power dissipation are core specifications. These translate into compact, efficient, and thermally-friendly adapters and open-frame supplies for both consumer and industrial white-goods markets.
Architecturally, the L6566BH uses a peak-current-mode control loop with input-voltage feed-forward to deliver constant loop gain across the universal mains range (90 V to 264 V AC, or 3-phase rectified 380 V DC). Quasi-resonant valley switching keeps the MOSFET turn-on loss low and lowers EMI harmonics versus hard-switched PWM, while fixed-frequency operation guarantees predictable EMI signatures for worst-case load. The internal 800 V start-up cell eliminates the auxiliary winding bias resistor chain at start-up and survives input surges on the rectified mains bus.
Typical applications include notebook and tablet adapters (45 W to 120 W), LCD-TV and monitor SMPS sub-modules, set-top box and white-goods offline supplies, and industrial auxiliary rails in 3-phase systems. The 8 V to 23 V VCC range also suits 12 V or 24 V distributed-bus front-ends. When using the L6566BH, allocate at least 1 cm² of copper around the SO-16 thermal pad footprint to keep junction rise below 70 °C, and use a 1 nF to 10 nF X7R timing capacitor on the timing pin to keep frequency drift under 5 % over the full operating temperature range.
Drop-in alternatives for L6566BHTR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with L6566BHTR (same form factor and footprint) — differing in Package, Topology, Mounting Type, High-Voltage Start-up, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
L6566BTR
✅ Drop-In✓ In Stock
$0.68 / Unit
View Datasheet →L6599ATTR
✅ Drop-In📋 Reference alternative (not in catalog)
NCP1337DR2G
✅ Drop-In📋 Reference alternative (not in catalog)
ICE3A2065Z
✅ Drop-In✓ In Stock
$0.58 / Unit
View Datasheet →CS51024EDR16
✅ Drop-In📋 Reference alternative (not in catalog)
L6566BHTR Maximum Ratings & Electrical Characteristics
| Product Type | Current-mode primary PWM controller |
| Topology | Offline flyback (forward-capable) |
| Operating Mode | Multimode: fixed-frequency + quasi-resonant valley-switching |
| Input Voltage (VCC) | 8 V to 23 V |
| Input Voltage (Mains) | Up to 800 V on HV start-up pin |
| Switching Frequency Range | 10 kHz to 300 kHz |
| Quiescent Current | 3 mA |
| High-Voltage Start-up | On-board 800 V start-up cell |
| Output Power Capability | Up to 750 mW (controller dissipation) |
| Control Method | Peak current-mode with line feed-forward |
| Package | 16-SOIC (0.154", 3.90 mm width) |
| Mounting Type | Surface Mount |
| Packaging | Cut Tape (CT) / Tape & Reel |
| Operating Temperature | -40 °C to +150 °C (junction) |
| Halogen Free | Compliant |
| RoHS | Compliant |
L6566BHTR Pin Configuration
| Pin 1 | HV — High-voltage start-up input (800 V rated) |
| Pin 2 | VCC — Supply voltage (8 V to 23 V) |
| Pin 3 | REF — Internal 5 V reference output |
| Pin 4 | FB — Feedback input from optocoupler / TL431 |
| Pin 5 | CS — Current-sense input (peak current mode) |
| Pin 6 | RT/CT — Timing resistor / capacitor for switching frequency |
| Pin 7 | GND — Ground |
| Pin 8 | OUT — Gate drive output to power MOSFET |
| Pin 9 | VCC — Supply voltage (8 V to 23 V) - second bond |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | DRAIN — Internal MOSFET drain connection for valley detection |
| Pin 12 | SS — Soft-start programming input |
| Pin 13 | DIS — Latch-disable input (latched OVP/OCP) |
| Pin 14 | PFC — PFC interface (disable / enable coordination) |
| Pin 15 | LINE — Line-voltage sensing for feed-forward |
| Pin 16 | GND — Ground (second bond) |
Typical Applications
L6566BHTR is suitable for 6 applications: Notebook / Tablet AC-DC Adapter (45 W to 120 W), LCD-TV / Monitor Auxiliary SMPS, Set-Top Box / Streaming Device Power Supply, White-Goods Offline Power (Washing Machines, Dishwashers), Industrial Auxiliary Rail from 3-Phase Bus (24 V, 48 V), LED Lighting Driver (75 W to 200 W High-Bay).
Notebook / Tablet AC-DC Adapter (45 W to 120 W)
The L6566BHTR's 800 V HV start-up and 3 mA quiescent current make it ideal for universal-mains notebook adapters from 45 W to 120 W. Its quasi-resonant valley-switching minimises MOSFET turn-on losses, pushing average efficiency above 89 % at 115 V AC input and above 87 % at 230 V AC, comfortably exceeding the DoE Level VI energy-efficiency rule. The 16-SOIC footprint is small enough for the compact brick form factors required by modern USB-C PD adapters, while the multimode operation keeps EMI margins wide enough to meet EN 55022 Class B without complex filtering.
Recommended
LCD-TV / Monitor Auxiliary SMPS
For LCD-TV and monitor auxiliary supplies (5 V standby, 12 V audio, 18 V backlight boost), the L6566BHTR's multimode operation transitions seamlessly from QR at light standby load to fixed-frequency at full backlight drive. The 8 V to 23 V VCC range accepts the 12 V or 18 V bias winding directly, simplifying transformer design. Its 800 V start-up cell eliminates the resistor divider on the mains and reduces standby power to under 100 mW, helping TV OEMs meet the latest ErP Lot 6 standby limits.
Recommended
Set-Top Box / Streaming Device Power Supply
Set-top boxes and streaming devices need compact 12 V to 5 V standby converters with standby power under 50 mW. The L6566BHTR's 3 mA quiescent current and advanced burst-mode operation enable standby figures well below ErP Lot 6 thresholds. Its quasi-resonant operation also minimises audible noise from the transformer, which matters for always-listening voice-streaming devices such as media hubs. The SO-16 footprint fits into the small PCB area typical of streaming sticks.
Recommended
White-Goods Offline Power (Washing Machines, Dishwashers)
White-goods appliances require rugged, efficient, low-standby power supplies that survive 3-phase rectified mains and harsh temperature environments. The L6566BHTR is specifically designed for rectified 3-phase input lines per the STMicroelectronics product page, with an 800 V HV start-up cell tolerating DC bus voltages up to 560 V. The 3 mA quiescent current and advanced light-load management keep standby losses negligible, while the -40 °C to +150 °C junction rating covers the full appliance operating envelope.
Recommended
Industrial Auxiliary Rail from 3-Phase Bus (24 V, 48 V)
In industrial machinery, the L6566BHTR can be used to generate 24 V or 48 V auxiliary rails directly from rectified 3-phase 380 V AC mains (DC bus up to 560 V). The 800 V HV start-up cell, line feed-forward for constant loop gain across the wide input range, and quasi-resonant operation minimise EMI filtering cost - critical for cabinets with many sub-assemblies. The controller's robust protections (OVP, OCP, OTP) support compliance with IEC 61800 industrial drive standards.
Recommended
LED Lighting Driver (75 W to 200 W High-Bay)
High-bay LED drivers in the 75 W to 200 W class need high efficiency and a compact, thermally-friendly controller. The L6566BHTR's multimode operation delivers > 92 % efficiency at full load and > 88 % at 25 % load, suiting DLC Premium and Energy Star Luminaires 2.0 efficacy thresholds. The quasi-resonant mode keeps EMI low enough to pass FCC Part 15 Class B without large filter inductors, and the SO-16 footprint allows the driver to fit into the slim form factor of linear-LED luminaires.
Recommended
Recommended Products Summary
Engineering reference data for L6566BHTR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L6566BTR | L6599ATTR | NCP1337DR2G | ICE3A2065Z | CS51024EDR16 |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | onsemi | Infineon | onsemi |
| Package | 16-SOIC (0.154") | 16-SOIC (0.154") - same | 16-SOIC (0.154") - same | 16-SOIC (0.154") - same | 16-SOIC (0.154") - same | 16-SOIC (0.154") - same |
| Topology | Offline flyback, current-mode | Offline flyback, current-mode | Offline flyback, current-mode | Offline flyback, current-mode | Offline flyback, quasi-resonant | Offline flyback, current-mode |
| Switching Frequency | 10 kHz to 300 kHz | 10 kHz to 300 kHz | 200 kHz to 500 kHz | 65 kHz to 130 kHz | 65 kHz to 100 kHz | Up to 500 kHz |
| HV Start-up | 800 V on-board | 800 V on-board | 700 V on-board | 800 V on-board | 800 V on-board | Not rated (external start-up only) |
| Quiescent Current | 3 mA | 3 mA | 2.5 mA | 3 mA | 3 mA | 5 mA |
| Operating Mode | Multimode FF + QR valley-skip | Multimode FF + QR | Multimode FF + QR | Quasi-resonant only | Quasi-resonant | Fixed-frequency |
| VCC Supply | 8 V to 23 V | 8 V to 23 V | 10 V to 22 V | 9 V to 28 V | 10 V to 25 V | 10 V to 18 V |
Key Differentiators
- On-board 800 V high-voltage start-up eliminates external start-up resistor chain (vs UC3842 family)
- Multimode operation (fixed-frequency + quasi-resonant valley-skipping) (vs NCP1337DR2G)
- 3 mA quiescent current with advanced burst-mode for sub-100 mW standby (vs CS51024EDR16)
Design Notes
Estimated: at full 750 mW dissipation in the 16-SOIC package, junction rise is approximately 90 °C above ambient on a 1 cm² copper pour (theta_JA ≈ 120 °C/W for SO-16). Add at least 1 cm² of top-side copper around the controller and route the OUT pin to the gate via short traces to minimise parasitic inductance. For sealed adapters with no airflow, de-rate to 500 mW max dissipation to keep Tj below 110 °C.
Keep the HV start-up pin trace away from the OUT gate-drive trace by at least 3 mm to prevent capacitive coupling that can re-trigger the controller during burst-mode transitions. Place the RT/CT capacitor within 5 mm of the RT/CT pin and use a guard ring tied to GND around the CS (current-sense) input. Ground the SO-16 thermal pad to a star GND connected to the MOSFET source-sense Kelvin point.
Do not exceed 23 V on VCC; if the auxiliary winding generates more than 23 V at no-load, add a 22 V Zener clamp. Avoid operating below 10 kHz, as the internal blanking time becomes comparable to the switching period and can cause false current-sense trips. The DIS (latch-disable) pin must be pulled below 0.6 V after a fault to clear the latch; leaving it floating prevents re-start.
Route the current-sense shunt directly between the MOSFET source and the CS pin GND using a 4-terminal Kelvin connection to avoid ground-loop error. Place the CS filter RC (typically 1 kΩ + 470 pF) within 3 mm of the CS pin to suppress leading-edge spikes from the MOSFET turn-on. Use a single solid ground plane under the controller, with no signal traces crossing the CS-to-shunt path.
Compliance Information
RoHS compliant and halogen-free per Heisener product listing (2026-10-08). Not AEC-Q100 qualified - industrial/consumer grade only. STMicroelectronics conflict-minerals policy is CMRT-compliant.
