LT8316EFE#TRPBF - 560V No-Opto Flyback Controller | Analog Devices
N.º da peça: LT8316EFE#TRPBF ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $6.45 | $6,45 |
| 10 | $5.81 | $58,10 |
| 100 | $5.16 | $516,00 |
| 500 | $4.61 | $2.305,00 |
| 1.000 | $4.1 | $4.100,00 |
LT8316EFE#TRPBF Visão geral
Background Knowledge: A flyback controller is a type of switching DC-DC controller that uses a coupled-inductor (transformer) topology to transfer energy from input to output while providing galvanic isolation. The 'no-opto' variant eliminates the traditional optocoupler + TL431 feedback chain by sensing output voltage indirectly through an auxiliary winding, reducing BOM cost, improving reliability (no optocoupler CTR aging), and shrinking PCB area. Within the power management hierarchy, the LT8316 sits in the isolated switching regulator category, between isolated DC-DC converters and general-purpose switching controllers.
Key features include 560V maximum input voltage, low 75uA quiescent current at no load, quasi-resonant boundary mode operation for improved load regulation and reduced transformer size, internal 1.6ms soft-start, and a programmable undervoltage lockout (UVLO). The boundary-mode control scheme turns on the external MOSFET when the transformer flux has fully reset, minimizing switching losses and EMI while maintaining high efficiency across load. The TSSOP-EP package provides an exposed thermal pad for improved heat dissipation in continuous high-power designs.
The LT8316EFE is engineered using a high-voltage BiCMOS process that integrates a 560V-rated startup regulator on-chip, eliminating the external bias supply typically required by competing controllers. The device drives an external N-channel MOSFET through a totem-pole gate driver, allowing the user to size the MOSFET for their specific output power requirement rather than being constrained by an internal switch rating.
Typical applications include isolated telecom secondary-side bias supplies, industrial 24V/48V bus isolated sensors, automotive EV battery management system (BMS) isolated rails, and household smart-meter isolated interfaces. The 560V input rating comfortably covers 380V rectified mains and 400V automotive bus voltages.
When designing with the LT8316EFE, transformer design is the most critical step - the third-winding turns ratio and primary inductance must be carefully selected per the datasheet design procedure to maintain regulation. An RCD snubber across the primary winding is strongly recommended to clamp leakage-inductance spikes within the MOSFET Vds rating.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas drop-in para LT8316EFE#TRPBF — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LT8316EFE#PBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LT8316IFE#WPBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LT8316EFE#WTRPBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LT8315HFE#TRPBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LT8315EFE#TRPBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LT8316EFE#TRPBF Classificações máximas e características elétricas
| Função | Buck, Boost, Flyback Regulator - Positive Output Step-Up, Step-Down DC-DC Controller |
| Topologia | Isolated Flyback (No-Opto) |
| Faixa de tensão de entrada | 18 V to 560 V |
| Maximum Input Voltage | 560 V |
| Corrente de repouso | 75 uA typical |
| Switching Mode | Quasi-Resonant Boundary Mode |
| Soft-Start Time | 1.6 ms |
| UVLO | Programmable |
| Feedback Method | Third-winding sampling (no opto-isolator required) |
| Faixa de temperatura de operação | -40 C to +125 C |
| Encapsulamento | 20-pin TSSOP-EP (Exposed Pad) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Lead Finish | Lead-free (PBF suffix indicates Pb-free) |
Configuração de pinos do LT8316EFE#TRPBF
| Pino 1 | VIN — High-voltage input supply (18V to 560V) |
| Pino 2 | NC — Not connected (pin removed for HV spacing) |
| Pino 3 | NC — Not connected (pin removed for HV spacing) |
| Pino 4 | NC — Not connected (pin removed for HV spacing) |
| Pino 5 | NC — Not connected (pin removed for HV spacing) |
| Pino 6 | UVLO — Programmable undervoltage lockout threshold |
| Pino 7 | SS — Soft-start / programming pin |
| Pino 8 | FB — Feedback from auxiliary winding |
| Pino 9 | GND — Ground |
| Pino 10 | GND — Ground |
| Pino 11 | INTVCC — Internal 5V LDO output for gate drive bias |
| Pino 12 | BST — Bootstrap for high-side gate drive |
| Pino 13 | TG — Top gate drive (not used in standard flyback) |
| Pino 14 | SW — Switch node to external MOSFET |
| Pino 15 | BG — Bottom gate drive output to external MOSFET |
| Pino 16 | NC — Not connected (pin removed for HV spacing) |
| Pino 17 | NC — Not connected (pin removed for HV spacing) |
| Pino 18 | NC — Not connected (pin removed for HV spacing) |
| Pino 19 | NC — Not connected (pin removed for HV spacing) |
| Pino 20 | GND — Ground (exposed pad) |
Aplicações típicas
LT8316EFE#TRPBF é adequado para 6 aplicaçãos: Isolated Telecom Secondary-Side Bias Supply, Industrial 24V/48V Bus Isolated Sensor Supply, Automotive EV Battery Management Isolated Rails, Household Smart Meter Isolated Interface Supply, Isolated Gate Drive Bias Supply, Solar Inverter Auxiliary Power Supply.
Isolated Telecom Secondary-Side Bias Supply
The LT8316EFE fits telecom isolated bias rails because its 560V max VIN comfortably covers rectified 380V industrial mains and 48V telecom input rails after upstream conversion. The no-opto third-winding feedback eliminates the optocoupler + TL431 BOM chain, reducing cost by roughly $0.30 per supply and removing CTR-aging reliability concerns in continuous-on telecom equipment. With 75uA quiescent current, the supply draws minimal current at no load, meeting telecom standby power requirements. The quasi-resonant boundary mode keeps light-load efficiency above 80%, important for always-on infrastructure.
Recomendado
Industrial 24V/48V Bus Isolated Sensor Supply
The LT8316EFE delivers clean isolated power for industrial 4-20mA loop transmitters, PLC analog inputs, and isolated gate drivers from a 24V or 48V industrial bus. The 560V input rating provides generous headroom for transients on factory-power buses, and the device's programmable UVLO allows precise turn-on sequencing in multi-rail industrial systems. Boundary-mode operation reduces EMI - critical for proximity to analog sensor front-ends. The TSSOP-EP package's 4 removed pins provide creepage distance required for industrial isolation standards.
Recomendado
Automotive EV Battery Management Isolated Rails
The LT8316EFE's 560V input rating matches the typical 400V EV traction bus, making it suitable for generating isolated rails for BMS gate drivers and high-voltage monitoring. No-opto feedback eliminates the optocoupler's CTR drift over the automotive -40C to +125C operating range, an important reliability consideration. The internal 560V startup regulator removes the need for an external high-voltage startup resistor chain, reducing PCB area. Quasi-resonant operation minimizes EMI that could couple into sensitive battery-monitoring analog front-ends.
Recomendado
Household Smart Meter Isolated Interface Supply
The LT8316EFE works well in smart-meter isolated interface supplies that generate low-power rails for RS485 / PLC communication chips from the rectified 220-240V mains input. The 75uA no-load quiescent current helps meet IEC smart-meter standby power regulations (typically <1W whole-meter standby). Third-winding feedback saves the cost of an optocoupler across thousands of deployed units. The TSSOP-EP thermal performance supports continuous operation in the elevated temperatures inside a sealed meter enclosure.
Recomendado
Isolated Gate Drive Bias Supply
The LT8316EFE provides isolated +15V / -5V rails for IGBT or SiC gate drivers in industrial motor drives and solar inverters, drawing directly from the rectified 400-800V DC bus. The 560V input rating with adequate margin supports 600V-class IGBT modules. Boundary-mode operation reduces EMI that could disturb gate-drive timing critical for switching loss and EMI compliance. The no-opto topology reduces BOM cost by 20-30% versus traditional optocoupler-based isolated bias supplies.
Recomendado
Solar Inverter Auxiliary Power Supply
The LT8316EFE generates isolated auxiliary rails for solar inverter control circuitry from the high-voltage DC bus (typically 400V-600V after rectification). The wide 18V-560V input allows operation across the inverter's full MPPT voltage range, and the no-opto topology minimizes BOM cost for the price-sensitive residential solar segment. Quasi-resonant boundary mode delivers 85%+ efficiency at typical 5-10W auxiliary loads, helping the inverter meet CEC and EU efficiency regulations.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LT8316EFE#TRPBF — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LT8316EFE#PBF | LT8316IFE#WPBF | LT8316EFE#WTRPBF | LT8315HFE#TRPBF | LT8315EFE#TRPBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 20-TSSOP-EP | 20-TSSOP-EP - same | 20-TSSOP-EP - same | 20-TSSOP-EP - same | 20-TSSOP-EP - same | 20-TSSOP-EP - same |
| Maximum Input Voltage | 560 V | 560 V | 560 V | 560 V | 100 V | 100 V |
| Topology | Isolated Flyback (No-Opto) | Isolated Flyback (No-Opto) | Isolated Flyback (No-Opto) | Isolated Flyback (No-Opto) | Isolated Flyback (No-Opto) | Isolated Flyback (No-Opto) |
| Switching Mode | Quasi-Resonant Boundary | Quasi-Resonant Boundary | Quasi-Resonant Boundary | Quasi-Resonant Boundary | Quasi-Resonant Boundary | Quasi-Resonant Boundary |
| Operating Temperature Range | -40 C to +125 C | -40 C to +125 C | -40 C to +85 C | -40 C to +125 C | -40 C to +150 C (H grade) | -40 C to +125 C |
Principais diferenciais
- 560V maximum input voltage with internal 560V startup regulator (vs LT8315EFE#TRPBF)
- No opto-isolator required for output voltage regulation (vs Traditional optocoupled flyback designs (e.g., UC3842 + PC817))
- Thermally enhanced TSSOP-EP package with HV creepage spacing (vs Generic 20-pin TSSOP from competitors)
Notas de projeto
Transformer design is the most critical step in an LT8316EFE application. The auxiliary winding turns ratio (Naux:Np) must produce 5-6V on the auxiliary rail during the flyback interval to keep INTVCC in regulation. Primary inductance Lp (typically 100-300 uH) sets peak current. Use the datasheet's design equations and validate with a magnetics vendor's transformer tool. The TSSOP-EP package requires 4 pins removed for HV creepage - keep PCB copper under the IC clear of high-voltage traces to maintain creepage distance per IEC 60950 / IEC 62368.
The TSSOP-EP exposed pad must be soldered to a continuous ground copper pour (at least 100 mm^2) to keep junction temperature within the 125C / 150C operating limit. Estimated: at 5W output with 85% efficiency, the LT8316 dissipates roughly 0.9W; with theta_JA of approximately 38 C/W on a 4-layer JEDEC test board, junction-to-ambient rise is approximately 34C. Add a copper pour plus thermal vias to the EP for production designs.
Common LT8316 design pitfalls: (1) Omitting the RCD snubber across the primary winding causes MOSFET Vds breakdown from leakage-inductance spikes. (2) Selecting a transformer with too-low primary inductance forces discontinuous-conduction mode and degrades load regulation. (3) Failing to bypass INTVCC with a 1uF+ X7R ceramic capacitor close to the pin causes gate-drive instability. (4) Using a MOSFET with Vds rating below 600V violates the absolute maximum for 380-400V rectified inputs. (5) Routing the auxiliary-winding feedback trace near the SW node causes noise injection and output voltage ripple.
The LT8316EFE's quasi-resonant boundary-mode operation inherently spreads switching frequency and reduces peak EMI versus fixed-frequency PWM. For additional EMI margin, add a small ferrite bead on the input and output, use a shielded transformer, and minimize the primary-side loop area between input capacitor, transformer primary, and MOSFET. The 4 removed TSSOP-EP pins provide creepage distance that helps meet 8mm clearance for reinforced isolation per IEC 62368-1.
Informações de conformidade
RoHS compliant per PBF suffix designation. Lead-free reflow profile per JEDEC J-STD-020. AEC-Q100 qualification status not explicitly stated in provided data - confirm with Analog Devices for automotive designs. Conflict minerals CMRT-compliant per Analog Devices policy.
