LT8316EFE#TRPBF - 560V No-Opto Flyback Controller | Analog Devices
料号： LT8316EFE#TRPBF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 概述
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.
直接替换替代料： LT8316EFE#TRPBF ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
LT8316EFE#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LT8316IFE#WPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT8316EFE#WTRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT8315HFE#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT8315EFE#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT8316EFE#TRPBF 最大额定值与电气特性
| 功能 | Buck, Boost, Flyback Regulator - Positive Output Step-Up, Step-Down DC-DC Controller |
| 拓扑 | Isolated Flyback (No-Opto) |
| 输入电压范围 | 18 V to 560 V |
| Maximum Input Voltage | 560 V |
| 静态电流 | 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) |
| 工作温度范围 | -40 C to +125 C |
| 封装 | 20-pin TSSOP-EP (Exposed Pad) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead Finish | Lead-free (PBF suffix indicates Pb-free) |
LT8316EFE#TRPBF 引脚配置
| 引脚 1 | VIN — High-voltage input supply (18V to 560V) |
| 引脚 2 | NC — Not connected (pin removed for HV spacing) |
| 引脚 3 | NC — Not connected (pin removed for HV spacing) |
| 引脚 4 | NC — Not connected (pin removed for HV spacing) |
| 引脚 5 | NC — Not connected (pin removed for HV spacing) |
| 引脚 6 | UVLO — Programmable undervoltage lockout threshold |
| 引脚 7 | SS — Soft-start / programming pin |
| 引脚 8 | FB — Feedback from auxiliary winding |
| 引脚 9 | GND — Ground |
| 引脚 10 | GND — Ground |
| 引脚 11 | INTVCC — Internal 5V LDO output for gate drive bias |
| 引脚 12 | BST — Bootstrap for high-side gate drive |
| 引脚 13 | TG — Top gate drive (not used in standard flyback) |
| 引脚 14 | SW — Switch node to external MOSFET |
| 引脚 15 | BG — Bottom gate drive output to external MOSFET |
| 引脚 16 | NC — Not connected (pin removed for HV spacing) |
| 引脚 17 | NC — Not connected (pin removed for HV spacing) |
| 引脚 18 | NC — Not connected (pin removed for HV spacing) |
| 引脚 19 | NC — Not connected (pin removed for HV spacing) |
| 引脚 20 | GND — Ground (exposed pad) |
典型应用
LT8316EFE#TRPBF 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： LT8316EFE#TRPBF ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- 560V maximum input voltage with internal 560V startup regulator （对比 LT8315EFE#TRPBF)
- No opto-isolator required for output voltage regulation （对比 Traditional optocoupled flyback designs (e.g., UC3842 + PC817))
- Thermally enhanced TSSOP-EP package with HV creepage spacing （对比 Generic 20-pin TSSOP from competitors)
设计说明
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.
合规信息
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.
