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STMicroelectronics L6599AFDTR
- Part No.:
- L6599AFDTR
- Manufacturer:
- STMicroelectronics
- Category:
- Power Supply Controllers, Monitors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L6599AFDTR.pdf
- Description:
- IC RESONANT CONVERTER 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,229
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Product details
Overview
L6599AFDTR from STMicroelectronics is a high-voltage resonant half-bridge controller IC designed for series-resonant LLC and LCC topologies in AC-DC power supplies. It delivers 50% complementary duty cycle, 58.2–65.8 kHz variable-frequency control, -50 °C to +150 °C operation, 600 V rail-compatible high-side gate driver with integrated synchronous bootstrap diode, and dual-level overcurrent protection (frequency-shift + latched shutdown). Used in outdoor LED drivers and street lighting systems requiring robust cold-temperature performance.
For engineers reviewing the L6599AFDTR datasheet, L6599AFDTR pinout, L6599AFDTR application, or L6599AFDTR equivalent, key selection criteria include its -50 °C guaranteed operation, 600 V floating supply tolerance, non-linear soft-start for monotonic voltage rise, burst-mode quiescent current of ≤400 µA, and PFC interface capability for coordinated pre-regulator shutdown.
Technical Context
The L6599AFDTR implements a relaxation oscillator with externally programmable frequency range (via CF capacitor and RFmin reference current), enabling output regulation through frequency modulation of the resonant tank. Its fixed 0.2–0.4 µs deadtime ensures zero-voltage switching (ZVS) across load and line variations.
It integrates two independent overcurrent protections: first-level frequency shift triggered at 0.8 V on ISEN (with 50 mV hysteresis), and second-level latched shutdown at 1.5 V. The DIS pin provides a latched disable path for OVP/OTP, while LINE input enables brownout detection with 1.24 V threshold and 13 µA hysteresis current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator freq. range | 58.2–65.8 kHz typical; sets resonant tank stimulation frequency for output voltage regulation via frequency modulation. |
| Duty cycle | 50% complementary; ensures equal conduction time for high-side and low-side MOSFETs with 0.2–0.4 µs deadtime for ZVS. |
| Operating temp. | -50 °C to +150 °C junction; validated for outdoor LED drivers and street lighting in extreme cold environments. |
| High-side drive | 600 V rail-compatible; integrated synchronous bootstrap DMOS replaces external fast-recovery diode, improving reliability and layout simplicity. |
| OCP thresholds | 0.8 V (frequency-shift response) and 1.5 V (latched shutdown); enables staged protection against overload and short-circuit faults. |
| Burst mode IQ | ≤400 µA residual consumption; reduces no-load losses to meet energy-efficiency standards like IEC 62301 standby power limits. |
| PFC interface | Open-drain PFC_STOP pin; asserts low during DIS >1.85 V, ISEN >1.5 V, LINE >6 V, or STBY <1.24 V to coordinate pre-regulator shutdown. |
Pinout & Package
Package: SO16N (16-pin small outline, 150 mil width, JEDEC MS-012AC), tape-and-reel packaging (TR suffix), RoHS-compliant, creepage-optimized layout with NC pin (Pin 13) for high-voltage isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Css) | Soft-start timing capacitor node | Connects external C to GND and R to RFmin; controls startup frequency decay profile and prevents output overshoot. |
| 2 (DELAY) | Overcurrent delay timer | RC network sets duration before latched shutdown; charges at 150 µA when ISEN >0.8 V, triggers restart at 0.33 V. |
| 3 (CF) | Oscillator timing capacitor | 470 pF typical; charged/discharged by current sourced from RFmin to set operating frequency. |
| 4 (RFmin) | Min. frequency reference current source | 2 V precision reference; 12 kΩ to GND sets min. frequency; optocoupler feedback resistor adjusts max. frequency. |
| 5 (STBY) | Burst mode threshold sense | Compares to 1.24 V internal ref; enters idle state when feedback-derived voltage falls below threshold. |
| 6 (ISEN) | Average primary current sense | 0.8 V threshold initiates frequency shift; 1.5 V threshold triggers latched shutdown; requires RC filtering for average current. |
| 7 (LINE) | Line sensing / brownout input | 1.24 V shutdown threshold with 13 µA hysteresis; clamped at 6 V; enables AC/DC brownout protection. |
| 8 (DIS) | Latched disable input | 1.85 V threshold; forces full shutdown until Vcc recycled; used for OTP/OVP fault coordination. |
| 9 (PFC_STOP) | Open-drain PFC controller enable | Pulled low during faults or burst mode; coordinates pre-regulator shutdown without external logic. |
| 10 (GND) | Signal and low-side return | Common return for LVG drive and bias circuitry; must be isolated from high-dI/dt paths. |
| 11 (LVG) | Low-side gate driver output | ±0.3 A source/sink peak; actively pulled to GND during UVLO; drives lower MOSFET in half-bridge leg. |
| 12 (Vcc) | IC supply input | 8.85–16 V operating range; 10.7 V turn-on, 8.15 V turn-off; bypassed with 0.1 µF ceramic for noise immunity. |
| 13 (NC) | No-connect spacer | Internally unconnected; increases creepage distance between HV pins (14–16) and LV pins (10–12) for safety compliance. |
| 14 (OUT) | High-side floating ground | Return path for HVG current; layout critical-must minimize loop area to suppress dv/dt-induced spikes. |
| 15 (HVG) | High-side gate driver output | ±0.3 A source/sink peak; referenced to OUT; drives upper MOSFET with 600 V tolerance and 50 V/ns dv/dt immunity. |
| 16 (VBOOT) | High-side floating supply | Accepts 580 V max; fed by internal synchronous bootstrap diode; eliminates external diode and improves efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Non-linear soft-start | Programmable frequency decay profile prevents output voltage overshoot and inrush current during cold-start at -50 °C. |
| Synchronous bootstrap diode | Integrated high-voltage DMOS replaces external fast-recovery diode, reducing BOM count and improving thermal reliability. |
| Two-level OCP | First-level frequency shift (0.8 V) limits power gradually; second-level latch (1.5 V) ensures fail-safe shutdown under sustained overload. |
| Brownout protection | LINE pin with 1.24 V threshold and 13 µA hysteresis enables precise AC/DC undervoltage lockout without external comparators. |
| PFC coordination | PFC_STOP pin provides automatic, fault-synchronized pre-regulator disable-no external logic required for system-level protection. |
Applications
| Outdoor LED Drivers | Street Lighting Systems |
|---|---|
|
Use Scenario: Constant-current LED drivers mounted on utility poles in arctic climates (-40 °C ambient). IC Role / Device Role / Timing Role: Resonant half-bridge controller regulating output via variable-frequency ZVS operation; manages soft-start, burst mode, and brownout recovery. Use Value: Guaranteed -50 °C operation ensures reliable startup and regulation where conventional controllers fail; synchronous bootstrap improves long-term reliability in vibration-prone fixtures. |
Use Scenario: High-efficiency 150 W–300 W smart streetlights with DALI dimming and grid-monitoring interfaces. IC Role / Device Role / Timing Role: Primary-side resonant controller coordinating with secondary-side feedback and PFC stage; handles light-load burst mode and line-sag events. Use Value: PFC_STOP interface enables synchronized shutdown during grid faults; 600 V HVG tolerance supports 305 VAC universal input with margin. |
| AC-DC Adapters (Open Frame) | Industrial SMPS for Harsh Environments |
|
Use Scenario: 200–500 W open-frame power supplies for telecom rectifiers and industrial equipment. IC Role / Device Role / Timing Role: Double-ended resonant controller implementing LLC topology with fixed deadtime and frequency-modulated regulation. Use Value: 0.2–0.4 µs deadtime ensures consistent ZVS across wide load range; dual OCP levels protect MOSFETs during transient overloads. |
Use Scenario: Power supplies in railway signaling cabinets or oilfield instrumentation exposed to -40 °C storage and rapid thermal cycling. IC Role / Device Role / Timing Role: Cold-qualified resonant controller managing startup, light-load efficiency, and fault recovery without derating. Use Value: -50 °C junction rating eliminates need for heater circuits or thermal derating; UVLO pull-down on LVG/HVG prevents shoot-through during brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage resonant half-bridge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC256301DR | Fixed 500 kHz max frequency; integrated X-capacitor discharge; no LINE brownout input; -40 °C min operating temp. | Targeted at consumer-grade adapters; lacks cold-start validation and dedicated brownout comparator. | Select if cost-sensitive design accepts -40 °C limit and omits line-sensing protection. |
| ICE2PCS01G | Combines PFC + resonant controller in one IC; 650 V HVG; -40 °C min; no latched DIS input; single-level OCP only. | Designed for compact all-in-one SMPS; not suitable for discrete PFC + resonant stage architectures. | Choose only when integrating PFC and LLC stages is mandatory and cold-temp operation beyond -40 °C is unnecessary. |
Compared with UCC256301DR and ICE2PCS01G, the L6599AFDTR uniquely guarantees -50 °C operation, includes a dedicated LINE brownout input with hysteresis, and offers dual-stage OCP with latched DIS-making it the only option qualified for outdoor infrastructure requiring extreme cold resilience and layered fault protection.
Availability
L6599AFDTR is available at Aetrix Electronics and suitable for outdoor LED drivers, street lighting systems, and open-frame AC-DC adapters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for L6599AFDTR 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The L6599AFDTR belongs to ST's high-voltage resonant controller product line, engineered specifically for ruggedized LLC/LCC half-bridge power supplies demanding cold-temperature reliability, integrated protection, and simplified high-side drive.
FAQ
What is the minimum guaranteed operating temperature for the L6599AFDTR?
The L6599AFDTR is fully specified and guaranteed to operate down to -50 °C junction temperature, verified per production data (DocID028175 Rev 4). This extends beyond standard industrial grade (-40 °C) and enables deployment in polar-region outdoor lighting and unheated industrial enclosures without thermal derating or auxiliary heating.
How does the synchronous bootstrap diode improve system reliability?
The integrated synchronous bootstrap DMOS replaces the external fast-recovery diode, eliminating its reverse recovery charge, forward voltage drop, and thermal stress. This reduces component count, improves efficiency by ~0.5%, and removes a common failure point-especially critical in high-vibration outdoor fixtures where solder joint fatigue can compromise discrete diodes.
Can the L6599AFDTR be used without the PFC controller interface?
Yes. The PFC_STOP pin is open-drain and inactive (high-impedance) when unused. Leaving it unconnected or tying it to Vcc via a pull-up resistor disables PFC coordination without affecting core resonant control functionality. All other features-including burst mode, soft-start, and OCP-remain fully operational.
What layout considerations are critical for the OUT (Pin 14) connection?
Pin 14 (OUT) is the high-side floating ground return. It must be routed as a short, low-inductance copper pour directly to the source of the high-side MOSFET and the negative terminal of the bootstrap capacitor. Avoid sharing this trace with any pulsed or noisy signals; keep it physically separated from GND and Vcc traces to prevent dv/dt coupling that could cause false triggering or shoot-through.
L6599AFDTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Resonant Converter Controller
- Voltage - Input:
- -
- Voltage - Supply:
- 8.85V ~ 16V
- Current - Supply:
- 3.5 mA
- Operating Temperature:
- -50°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
L6599AFDTR FAQ
1.How can I place an order for L6599AFDTR through Aetrix?
Please submit a Request for Quotation (RFQ) for L6599AFDTR 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 L6599AFDTR reliable?
The price and inventory of L6599AFDTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6599AFDTR is usually 5 days.
3.What payment methods are accepted for L6599AFDTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6599AFDTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6599AFDTR?
L6599AFDTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6599AFDTR 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 L6599AFDTR?
For technical support, including L6599AFDTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6599AFDTR requirements.
6.How does Aetrix verify that L6599AFDTR is sourced from the original manufacturer or authorized distributors?
All L6599AFDTR 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 L6599AFDTR meets industry standards.
7.What is the process for return or replacement of L6599AFDTR?
All L6599AFDTR units undergo pre-shipment inspection (PSI). If there is an issue with L6599AFDTR, 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 L6599AFDTR part is unused and in its original packaging.
Return procedure for L6599AFDTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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