LT1999

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高电压、双向电流检测放大器

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产品技术资料帮助

ADI公司所提供的资料均视为准确、可靠。但本公司不为用户在应用过程中侵犯任何专利权或第三方权利承担任何责任。技术指标的修改不再另行通知。本公司既没有含蓄的允许，也不允许借用ADI公司的专利或专利权的名义。本文出现的商标和注册商标所有权分别属于相应的公司。

概述

  • 具有3种增益选项的缓冲输出：10V/V、20V/V、50V/V
  • 增益精度：0.5%（最大值）
  • 输入共模电压范围：–5V至80V
  • AC CMRR > 80dB (100kHz)
  • 输入失调电压：1.5mV（最大值）
  • –3dB带宽：2MHz
  • 在整个共模范围内实现顺畅的连续操作
  • 4kV HBM容差和1kV CDM容差
  • 低功耗关断：<10µA
  • 工作温度范围：-55°C至150°C
  • 8引脚MSOP和8引脚SO（窄体）封装
  • 8引脚MSOP引脚排列选项，适用于FMEA
  • AEC-Q100通过汽车应用认证

     
LT1999
高电压、双向电流检测放大器
LT1999-10-1999-20-1999-50 Application circuit LT1999-10-1999-20-1999-50 Pin configuration LT1999-10-1999-20-1999-50 Pin Configuration LT1999-10-1999-20-1999-50 Pin Configuration LT1999-10-1999-20-1999-50 Performance Graph
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参考资料

数据手册 2

用户手册 1

应用笔记 1

设计笔记 1

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工具及仿真模型

LTspice 1

LTspice中提供以下器件型号：

  • LT1999-10
  • LT1999-20
  • LT1999-50
LTspice

LTspice®是一款强大高效的免费仿真软件、原理图采集和波形观测器，为改善模拟电路的仿真提供增强功能和模型。

评估套件

eval board
schematic 1
DC1698A

LT1999-10 (MS8) Demoboard

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产品详情

Demonstration circuit 1698A features the LT1999, a high voltage, bi-directional current sense amplifier.

The demo board amplifies the voltage drop across an on board current sense resistor. The output voltage is a bi-directional signal that is centered on the VREF voltage and is proportional to the current through the sense resistor. The output is scaled by one of three fixed gain options. The gain options are: 10V/V (DC1698A-A), 20V/V (DC1698A-B) and 50V/V (DC1698A-C). The input voltage range is from –5V to 80V (independent of the device supply voltage) allowing the part to be used for high or low side current sensing. The LT1999 requires a separate 5V supply voltage.

DC1698A
LT1999-10 (MS8) Demoboard
DC1698A-A - Schematic

参考电路

ADPS30146-RD Power Tree
ADPS30146-RD Power Tree
ADPS30146-RD EVB 3D View Image
ADPS30146-RD EVB Top View Image
ADPS30146-RD EVB Bottom View Image
ADPS30146-RD Industrial Power Solution 参考设计

High‑Efficiency GaN Motor Drive Control Solution for BLDC and Servo Motors

查看参考设计详情

特性和优点

  • Compact GaN servo drive with integrated gate drive and sensing
  • Accurate current sensing improves torque regulation and dynamic response
  • Adjustable 25–100 kHz PWM with fine dead time control for low-noise efficiency
  • GaN efficiency removes need for external cooling
  • Small PCB footprint with optional LC/LCL filtering for clean output and motor integration
  • Compatible with multiple controllers, supporting 50–750 W across diverse motor types

Electrical Requirements:

  • Input Voltage: 48–58 V battery source
  • Output Voltage: 50–750 W
  • Board V1 Output: Conventional GaN switching waveform
  • Board V2 Output: Sine wave output generated through LC/LCL filtering

Control & Feedback Requirements:

  • PWM Frequency: 25–100 kHz
  • PWM Tuning Parameters: Switching frequency and dead time adjustment
  • Current Sensing Method: In-line sensing, two-phase measurement (U and W)
  • Scalability: Configurable sense resistor and amplifier gain

Mechanical Requirements:

  • PCB Size: 40 × 50 mm
  • Setup Variations: Extended cable connection between driver board and motor. Driver board mechanically integrated within the motor assembly
  • Thermal Constraints: Passive cooling only (no heatsink and no forced airflow)
  • Motor Load: MINAS A6 48 V, 400 W (MSMD04BL1S). Hollow shaft BLDC motors

Protection Requirements:

  • Provision for DC bus back EMF energy dissipation
ADPS30146-RD Industrial Power Solution
High‑Efficiency GaN Motor Drive Control Solution for BLDC and Servo Motors
ADPS30146-RD Power Tree
ADPS30146-RD EVB 3D View Image
ADPS30146-RD EVB Top View Image
ADPS30146-RD EVB Bottom View Image

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