ZHCSTT4H November 2007 – October 2024 LM3481
PRODUCTION DATA
参数 | 测试条件 | 最小值 | 典型值 | 最大值 | 单位 | |
---|---|---|---|---|---|---|
VFB | 反馈电压 | VCOMP = 1.4V,2.97V ≤ VIN ≤ 48V | 1.275 | V | ||
VCOMP = 1.4V,2.97V ≤ VIN ≤ 48V,–40°C ≤ TJ ≤ 125°C | 1.256 | 1.294 | ||||
ΔVLINE | 反馈电压线性调整率 | 2.97V ≤ VIN ≤ 48V | 0.003 | %/V | ||
ΔVLOAD | 输出电压负载调整率 | IEAO 拉电流/灌电流 | ±0.5 | %/A | ||
VUVLOSEN | 欠压锁定基准电压 | VUVLO 逐渐下降 | 1.430 | V | ||
VUVLO 逐渐下降,–40°C ≤ TJ ≤ 125°C | 1.345 | 1.517 | ||||
IUVLO | UVLO 拉电流 | 启用 | 5 | µA | ||
启用,–40°C ≤ TJ ≤ 125°C | 3 | 6 | ||||
VUVLOSD | UVLO 关断电压 | 0.55 | 0.7 | 0.82 | V | |
ICOMP | COMP 引脚电流源 | VFB = 0V | 640 | µA | ||
VCOMP | VFB = 1.275V | 1.4 | V | |||
fnom | 标称开关频率 | RFA = 40kΩ | 475 | kHz | ||
RFA = 40kΩ,–40°C ≤ TJ ≤ 125°C | 406 | 550 | ||||
Vsync-HI | FA/SYNC/SD 引脚上的同步阈值 | 同步电压上升 | 1.4 | V | ||
Vsync-LOW | FA/SYNC/SD 引脚上的同步阈值 | 同步电压下降 | 0.7 | V | ||
RDS1 (ON) | 驱动器开关导通电阻(顶部) | IDR = 0.2A,VIN= 5V | 4 | Ω | ||
RDS2 (ON) | 驱动器开关导通电阻(底部) | IDR = 0.2A | 2 | Ω | ||
VDR (max) | 最大驱动电压摆幅(1) | VIN < 6V | VIN | V | ||
VIN ≥ 6V | 6 | |||||
Dmax | 最大占空比 | RFA = 40kΩ | 81 | 85 | % | |
tmin (on) | 最短导通时间 | 250 | 363 | ns | ||
整个温度范围内的最坏情况 | 571 | ns | ||||
ISUPPLY | 电源电流(开关) | 请参阅(2) | 3.7 | mA | ||
请参阅(2),–40°C ≤ TJ ≤ 125°C | 5.0 | |||||
IQ | 关断模式下的静态电流 | VFA/SYNC/SD = 3V(3),VIN = 12V | 9 | µA | ||
VFA/SYNC/SD = 3V(3),VIN = 12V,–40°C ≤ TJ ≤ 125°C | 15 | |||||
VFA/SYNC/SD = 3V(3),VIN = 5V | 5 | |||||
VFA/SYNC/SD = 3V(3),VIN = 5V,–40°C ≤ TJ ≤ 125°C | 10 | |||||
VSENSE | 电流检测阈值电压 | 160 | mV | |||
–40°C ≤ TJ ≤ 125°C | 100 | 190 | ||||
VSC | 短路电流限制检测电压 | 220 | mV | |||
–40°C ≤ TJ ≤ 125°C | 157 | 275 | ||||
VSL | 内部补偿斜坡电压 | 90 | mV | |||
VOVP | 输出过压保护(相对于反馈电压)(4) | VCOMP = 1.4V | 85 | mV | ||
VCOMP = 1.4V,–40°C ≤ TJ ≤ 125°C | 26 | 135 | ||||
VOVP(HYS) | 输出过压保护迟滞 | VCOMP = 1.4V | 70 | mV | ||
VCOMP = 1.4V,–40°C ≤ TJ ≤ 125°C | 28 | 106 | ||||
Gm | 误差放大器跨导 | VCOMP = 1.4V | 450 | µS | ||
VCOMP = 1.4V,–40°C ≤ TJ ≤ 125°C | 216 | 690 | ||||
AVOL | 误差放大器电压增益 | VCOMP = 1.4V,IEAO = 100µA(拉电流/灌电流) | 60 | V/V | ||
VCOMP = 1.4V,IEAO = 100µA(拉电流/灌电流),–40°C ≤ TJ ≤ 125°C | 35 | 66 | ||||
IEAO | 误差放大器输出电流(拉电流/灌电流) | 拉电流,VCOMP = 1.4V,VFB = 0V | 640 | µA | ||
拉电流,VCOMP = 1.4V,VFB = 0V,–40°C ≤ TJ ≤ 125°C | 475 | 837 | ||||
灌电流,VCOMP = 1.4V,VFB = 1.4V | 65 | µA | ||||
灌电流,VCOMP = 1.4V,VFB = 1.4V,–40°C ≤ TJ ≤ 125℃ | 31 | 100 | ||||
VEAO | 误差放大器输出电压摆幅 | 上限:VFB = 0V,COMP 引脚悬空 | 2.70 | V | ||
上限:VFB = 0V,COMP 引脚悬空,–40°C ≤ TJ ≤ 125°C | 1.8 | 2.93 | ||||
下限:VFB = 1.4V | 0.60 | V | ||||
下限:VFB = 1.4V,–40°C ≤ TJ ≤ 125°C | 0.32 | 0.90 | ||||
tSS | 内部软启动延迟 | VFB = 1.2V,COMP 引脚悬空 | 8.7 | 15 | 21.3 | ms |
tr | 驱动引脚上升时间 | Cgs = 3000pf、VDR = 0V 至 3V | 25 | ns | ||
tf | 驱动引脚下降时间 | Cgs = 3000pf、VDR = 3V 至 0V | 25 | ns | ||
VSD | 关断信号阈值(5)FA/SYNC/SD 引脚 | 输出 = 高电平(关断) | 1.31 | V | ||
输出 = 高电平(关断),–40°C ≤ TJ ≤ 125°C | 1.40 | |||||
输出 = 低电平(使能) | 0.68 | V | ||||
输出 = 低电平(使能),–40°C ≤ TJ ≤ 125°C | 0.40 | |||||
ISD | 关断引脚电流 FA/SYNC/SD 引脚 | VSD = 5V | -1 | µA | ||
VSD = 0V | 20 | |||||
TSD | 热关断 | 165 | °C | |||
Tsh | 热关断迟滞 | 10 | °C |