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STMicroelectronics E-L6561
- Part No.:
- E-L6561
- Manufacturer:
- STMicroelectronics
- Category:
- PFC (Power Factor Correction)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
E-L6561.pdf
- Description:
- IC PFC CTRLR TRANSITION 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,718
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Product details
Overview
L6561 from STMicroelectronics is a transition-mode Power Factor Correction (PFC) controller IC designed for AC-DC front-end stages in electronic lamp ballasts, SMPS, and adapters. It features 1% precision internal reference voltage (2.5 V @ Tj = 25°C), ±400 mA totem-pole gate driver output, micro-power start-up current (50 µA typ.), and integrated zero-current detection with disable function on ZCD pin - enabling efficient 85–265 VAC input operation with <3.7% THD in wide-range applications.
For engineers reviewing the L6561 datasheet, L6561 pinout, L6561 application, or L6561 equivalent, key selection considerations include its transition-mode PFC architecture, internal OVP threshold accuracy (±7%), DIP-8/SO-8 package compatibility, and real-time dynamic/static overvoltage protection triggered at 35–45 µA error amplifier current.
Technical Context
The L6561 implements a mixed-signal BCD process-based analog multiplier with linear operating range of 0–3.5 V on MULT pin and gain of 0.45–0.75 V⁻¹, enabling precise line-voltage feedforward across universal AC inputs. Its error amplifier delivers 60–80 dB open-loop gain and 1 MHz GBW, with clamped COMP output (2.25–5.8 V) and ±4–8 mA drive capability.
Transition-mode operation is enforced via zero-current detection on ZCD pin (2.1 V rising-edge threshold, 0.3–0.7 V hysteresis), while internal start-up timer (70–400 µs) and UVLO (11–13 V turn-on, 8.7–10.3 V turn-off) ensure reliable power sequencing. The device integrates current-sense filtering and eliminates need for external low-pass RC networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Mode | Transition-mode (critical conduction mode) PFC control - enables high efficiency and low EMI without fixed-frequency switching constraints. |
| Reference Voltage | 2.5 V ±1% @ Tj = 25°C - sets precise output voltage regulation point via external R1/R2 divider in feedback loop. |
| Gate Driver Output | ±400 mA sink/source capability - directly drives MOSFET/IGBT gates without external buffer, reducing BOM count. |
| OVP Trigger Current | 35–45 µA dynamic threshold - initiates fast shutdown when output overvoltage causes error amplifier current surge. |
| Start-up Current | 20–90 µA (typ. 50 µA) - minimizes auxiliary supply losses during initial power-up, critical for low-standby designs. |
| ZCD Disable Threshold | 150–250 mV - grounding ZCD pin disables controller and reduces quiescent current to 1.4–2.1 mA, enabling standby mode. |
| Supply Range (VCC) | 11–18 V operating, 11–13 V turn-on, 8.7–10.3 V turn-off - ensures stable operation across wide input transients and brownout conditions. |
Pinout & Package
Available in DIP-8 and SO-8 packages per Table 1; mechanical dimensions conform to JEDEC MS-001 (DIP-8) and MO-153 (SO-8) standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INV) | Inverting input of error amplifier | Connects to resistive divider from regulated output - sets feedback reference point at 2.5 V for precise voltage regulation. |
| 2 (COMP) | Error amplifier output | Drives multiplier input; clamped between 2.25 V and 5.8 V - provides stable control signal with ±4–8 mA drive strength. |
| 3 (MULT) | Multiplier input | Accepts rectified mains-derived voltage (0–3.5 V) - enables line-voltage feedforward for constant power delivery and low THD. |
| 4 (CS) | Current sense comparator input | Monitors MOSFET source current via sense resistor - includes on-chip filtering to reject noise without external RC network. |
| 5 (ZCD) | Zero-current detector / disable input | Detects inductor current zero-crossing for transition-mode timing; pulled ≤150 mV to disable IC and reduce standby current. |
| 6 (GND) | Power and signal ground | Common return for control logic, driver stage, and current sensing - requires low-impedance PCB layout to avoid noise coupling. |
| 7 (GD) | Gate driver output | Pull-push stage delivering ±400 mA peak - directly switches MOSFET/IGBT with 40–100 ns rise/fall times into 1 nF load. |
| 8 (VCC) | Supply voltage input | Power rail for internal regulator and driver - supports 11–18 V operation with UVLO hysteresis (2.2–2.8 V) for robust startup. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated OVP protection | Dynamic (35–45 µA) and static (2.1–2.4 V) thresholds - prevents damage from output capacitor failure or feedback loss. |
| On-chip current sense filter | Eliminates need for external RC low-pass filter - simplifies layout and improves noise immunity in high-dV/dt environments. |
| Soft-start via internal timer | 70–400 µs built-in start-up delay - prevents inrush current surges and ensures controlled ramp-up of PFC output voltage. |
| Disable function on ZCD | Reduces quiescent current to 1.4–2.1 mA when ZCD ≤150 mV - enables low-power standby without external enable circuitry. |
| Mixed BCD technology | Enables 1% reference precision, micro-power start-up (50 µA), and ±400 mA gate drive in single die - balances analog accuracy and power efficiency. |
Applications
| Electronic Lamp Ballast | Universal Input AC-DC Adapter |
|---|---|
|
Use Scenario: 80 W fluorescent lamp ballast operating from 85–265 VAC with 400 VDC output. IC Role / Device Role / Timing Role: Transition-mode PFC controller regulating boost stage to maintain near-unity power factor and low THD (<3.7%) across full input range. Use Value: Enables compliance with IEC 61000-3-2 Class C harmonic limits while achieving >92.8% efficiency at 85 VAC input. |
Use Scenario: 120 W laptop adapter accepting 175–265 VAC input with 400 VDC intermediate bus. IC Role / Device Role / Timing Role: Primary-side PFC controller enforcing zero-current switching to minimize switching losses and EMI generation. Use Value: Delivers PF >0.976 and THD <8.3% at 265 VAC without external THD-reduction circuitry, reducing component count. |
| Industrial SMPS Front-End | LED Driver Power Supply |
|
Use Scenario: 80 W industrial switch-mode power supply with wide-input (85–265 VAC) and 400 VDC bus requirement. IC Role / Device Role / Timing Role: Critical-conduction-mode PFC controller managing boost inductor current zero-crossing via ZCD pin for optimal timing control. Use Value: Achieves 95.8% efficiency at 135 VAC with <6.2% THD, meeting EN 61000-3-2 requirements for professional equipment. |
Use Scenario: Constant-current LED driver for street lighting using 85–265 VAC input and 400 VDC intermediate bus. IC Role / Device Role / Timing Role: PFC front-end controller ensuring stable DC bus under varying LED load conditions and ambient temperature shifts. Use Value: Maintains output regulation within ±14 V over full input range and temperature (-40°C to +125°C), supporting long-life thermal design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transition-mode PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28019 (Texas Instruments) | Fixed-frequency CCM PFC controller with 500 kHz max switching frequency; lacks ZCD-based transition-mode timing and integrated OVP current threshold. | Requires external zero-crossing detection for CRM operation; better suited for higher-power (>200 W) continuous conduction mode designs. | Select UCC28019 only when fixed-frequency control and higher power density outweigh need for ultra-low THD and simplified layout. |
| FAN7930C (ON Semiconductor) | Transition-mode PFC controller with 2.5 V reference but no internal start-up timer; OVP uses voltage threshold (2.25 V) instead of current-sensing method. | Needs external RC start-up network; less accurate OVP setting (±10% vs. ±7%) and higher typical start-up current (100 µA). | Choose FAN7930C only if cost sensitivity dominates and ±10% OVP tolerance and added start-up components are acceptable. |
Compared with UCC28019 and FAN7930C, the L6561 uniquely combines transition-mode timing, current-sensed dynamic OVP, and micro-power start-up in a single DIP-8/SO-8 package - making it optimal for cost-sensitive, low-THD, universal-input PFC stages below 150 W.
Availability
L6561 is available at Aetrix Electronics and suitable for electronic lamp ballasts, universal-input AC-DC adapters, and industrial SMPS front-end designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for L6561 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, and automotive ICs with vertical manufacturing capabilities and broad industrial qualification coverage.
The L6561 belongs to ST's legacy Power Factor Correction controller product line, engineered specifically for cost-effective, high-efficiency transition-mode PFC in lighting, adapter, and industrial power supply applications.
FAQ
What is the purpose of the ZCD pin on the L6561?
The ZCD (Zero-Current Detection) pin serves dual functions: first, it detects inductor current zero-crossing to synchronize switching in transition mode; second, pulling this pin to ≤150 mV disables the IC, reducing quiescent current to 1.4–2.1 mA for standby operation - eliminating need for external enable circuitry.
How does the L6561 implement overvoltage protection?
The L6561 uses two-tier OVP: dynamic protection triggers when error amplifier current exceeds 35–45 µA (caused by abrupt output voltage rise), forcing multiplier output down; static protection activates if overvoltage persists, latching GD output off until reset - both mechanisms rely on internal comparators without external components.
Can the L6561 operate across universal AC input (85–265 VAC)?
Yes - its transition-mode architecture, wide-input multiplier range (0–3.5 V), and internal UVLO (11–13 V turn-on) enable stable operation from 85–265 VAC. Application circuits in the datasheet demonstrate validated performance at 85 VAC (92.8% efficiency, 3.7% THD) and 265 VAC (97.3% efficiency, 13.7% THD).
What package options are offered for the L6561?
The L6561 is offered in DIP-8 (JEDEC MS-001) and SO-8 (JEDEC MO-153) packages, with tape-and-reel variants (L6561D013TR) available for automated assembly. Both packages share identical pinout and electrical characteristics, differing only in thermal resistance (150°C/W for DIP-8, 100°C/W for SO-8).
E-L6561 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Mode:
- Discontinuous (Transition)
- Frequency - Switching:
- -
- Current - Startup:
- 50 µA
- Voltage - Supply:
- 11V ~ 18V
- Operating Temperature:
- -25°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-DIP
E-L6561 FAQ
1.How can I place an order for E-L6561 through Aetrix?
Please submit a Request for Quotation (RFQ) for E-L6561 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for E-L6561 reliable?
The price and inventory of E-L6561 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-L6561 is usually 5 days.
3.What payment methods are accepted for E-L6561?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-L6561 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for E-L6561?
E-L6561 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your E-L6561 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for E-L6561?
For technical support, including E-L6561 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-L6561 requirements.
6.How does Aetrix verify that E-L6561 is sourced from the original manufacturer or authorized distributors?
All E-L6561 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that E-L6561 meets industry standards.
7.What is the process for return or replacement of E-L6561?
All E-L6561 units undergo pre-shipment inspection (PSI). If there is an issue with E-L6561, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The E-L6561 part is unused and in its original packaging.
Return procedure for E-L6561:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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