IC697CPX772工控模块系统备件
该架构使用相同
NFB引脚调节为–2.48V，而放大器输出内部驱动FB引脚至1.245V。该架构使用相同的主误差放大器，防止了功能重复，并保持了易用性。请咨询LTC市场部，了解可调节至-1.25V的装置。放大器输出端产生的误差信号从外部输出。该引脚（VC）具有三种不同的功能。用于频率补偿、电流限制调整和软启动。在正常调节器操作期间，该引脚的电压介于1V（低输出电流）和1.9V（高输出电流）。误差放大器是电流输出（gm）型，因此该电压可以被外部箝位以降低电流限制。同样，电容器耦合的外部箝位将提供软启动。如果VC引脚被拉到控制引脚阈值以下，则开关占空比变为零，从而将LT1370置于空闲模式。正输出电压设置LT1370从FB引脚到地形成1.245V参考电压（VREF）。
电阻分压器
通过将FB引脚连接到输出电阻分压器来设置输出电压（图1）。FB引脚偏置电流代表一个小的误差，对于R2值高达7k的情况，通常可以忽略不计。R2的建议值为6.19k。对于正输出应用，NFB引脚通常保持打开状态。可提供正固定电压版本（请咨询LTC营销部）。负输出电压设置LT1370从NFB引脚到地形成–2.48V参考电压（VNFR）。通过将NFB引脚连接到输出电阻分压器来设置输出电压（图2）。–30µA NFB引脚偏置电流（INFB）可能导致输出电压错误，不应忽略。这在图2中的公式中得到了解释。R2的建议值为2.49k。
The schema uses the same
The NFB pin is adjusted to – 2.48V, while the amplifier output internally drives the FB pin to 1.245V. This architecture uses the same main error amplifier to prevent duplication of functions and maintain ease of use. Please consult the LTC Marketing Department for devices that can be adjusted to -1.25V. The error signal generated at the output end of the amplifier is output externally. This pin (VC) has three different functions. Used for frequency compensation, current limit adjustment and soft start. During normal regulator operation, the voltage of this pin is between 1V (low output current) and 1.9V (high output current). The error amplifier is current output (gm) type, so the voltage can be clamped externally to reduce the current limit. Similarly, external clamping of capacitor coupling will provide soft start. If the VC pin is pulled below the control pin threshold, the switch duty cycle becomes zero, thereby placing the LT1370 in idle mode. The positive output voltage setting LT1370 forms a 1.245V reference voltage (VREF) from the FB pin to the ground.
Resistance divider
Set the output voltage by connecting the FB pin to the output resistance voltage divider (Figure 1). The bias current of FB pin represents a small error, which can usually be ignored when R2 value is up to 7k. The recommended value of R2 is 6.19k. For positive output applications, the NFB pin usually remains open. Positive fixed voltage version is available (please consult LTC Marketing Department). The negative output voltage setting LT1370 forms – 2.48V reference voltage (VNFR) from NFB pin to ground. Set the output voltage by connecting the NFB pin to the output resistance divider (Figure 2). – 30 µ A NFB pin bias current (INFB) may cause output voltage errors and should not be ignored. This is explained in the formula in Figure 2. The recommended value of R2 is 2.49k.
