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NCP1377 组合了真正的电流模式调制器和去磁化检测器,确保了任何负载/线路条件下的完全边界/临界导通模式,且具有最小的漏极电压开关(准谐振运行)。由于其内在的跳过周期功能,该控制器可在电源要求降至预先确定的水平后立即进入突发模式。因为这发生在低峰值电流处,所以不会听到噪声。对于 NCP1377,一个内部 8.0µs 计时器可防止空转频率超过 150 kHz CISPR-22 EMI 启动限值,而跳过调节功能则使得用户能够选择突发折回发生的频率。对于 NCP1377B, 内部计时器持续时间则降至 3.0µs,允许在更高频率下运行。变压器核芯重置检测使用专用引脚实现的辅助绕组完成,还能实现快速过电压保护 (OVP)。一旦检测到 OVP,该集成电路则会永久性锁存关断。1377 的采样时间为 4.5µs,B 版本的采样时间为 1.5µs。NCP1377 还具有有效保护电路,如果发生过电流情况,则会禁用输出脉冲,进入安全突发模式,尝试重启。一旦故障清除,器件自动恢复。最后,内部 1ms 软启动避免了传统的启动压力。
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Reference Price
NCP1377BD1R2G
Last Shipments
Pb
A
H
P
SOIC-7
1
260
REEL
2500
N
Flyback
Current Mode
Variable
Yes
Yes
No
Yes
Yes
16
500 / 500
Price N/A
More Details
NCP1377BDR2G
Last Shipments
Pb
A
H
P
SOIC-8
1
260
REEL
2500
N
Flyback
Current Mode
Variable
Yes
Yes
No
Yes
Yes
16
500 / 500
Price N/A
More Details
NCP1377BPG
Obsolete
Pb
A
H
P
PDIP-8
NA
0
TUBE
50
N
Flyback
Current Mode
Variable
Yes
Yes
No
Yes
Yes
16
500 / 500
Price N/A
More Details
NCP1377D1R2G
Last Shipments
Pb
A
H
P
SOIC-7
1
260
REEL
2500
N
Flyback
Current Mode
Variable
Yes
Yes
No
Yes
Yes
16
500 / 500
Price N/A
More Details
NCP1377DR2G
Last Shipments
Pb
A
H
P
SOIC-8
1
260
REEL
2500
N
Flyback
Current Mode
Variable
Yes
Yes
No
Yes
Yes
16
500 / 500
Price N/A
More Details
NCP1377PG
Obsolete
Pb
A
H
P
PDIP-8
NA
0
TUBE
50
N
Flyback
Current Mode
Variable
Yes
Yes
No
Yes
Yes
16
500 / 500
Price N/A
More Details
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