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NCP1377 Datasheet PDF

Part Series:
NCP1377 Series
Category:
-
Description:
AC-DC Offline Switching Controllers/Regulators
Updated Time: 2023/01/13 03:03:11 (UTC + 8)

NCP1377 - Datasheet PDF

NCP1377 Datasheet PDF -

18 Pages
ON Semiconductor
Current Mode PWM Controller 18V 500mA 100kHz 8Pin SOIC N T/R
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Current Mode PWM Controller 18V 500mA 100kHz 7Pin PDIP Tube
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ON Semiconductor
Current Mode PWM Controller 18V 500mA 100kHz 8Pin SOIC N T/R
18 Pages
ON Semiconductor
Current Mode PWM Controller 18V 500mA 300kHz 7Pin PDIP Rail
17 Pages
ON Semiconductor
Current Mode PWM Controller 18V 500mA 300kHz 7Pin SOIC T/R
17 Pages
ON Semiconductor
Current Mode PWM Controller 18V 500mA 100kHz 7Pin PDIP Rail
17 Pages
ON Semiconductor
AC-DC Offline Switching Controllers/Regulators

NCP1377 - ON Semiconductor Function Overview

The NCP1377 combines a true current mode modulator and a demagnetization detector which ensures full borderline / critical Conduction Mode in any load/line conditions together with minimum drain voltage switching (Quasi-Resonant operation). Due to its inherent skip cycle capability, the controller enters burst mode as soon as the power demand falls below a predetermined level. As this happens at low peak current, no audible noise can be heard. For NCP1377, an internal 8.0µs timer prevents the free-run frequency to exceed the 150kHz CISPR-22 EMI starting limit while the skip adjustment capability lets the user select the frequency at which the burst foldback takes place. For NCP1377B, the internal timer duration is reduced to 3.0µs to allow operation at higher frequencies.The transformer core reset detection is done through an auxiliary winding which, brought via a dedicated pin, also enables fast Over-Voltage Protection (OVP). Once an OVP has been detected, the IC permanently latches-off. The 1377 features a sampling time of 4.5µs whereas it is 1.5µs for the B version.The NCP1377 also features an efficient protective circuitries which, in presence of an overcurrent condition, disables the output pulses and enters a safe burst mode, trying to re-start. Once the default has gone, the device auto-recovers. Finally an internal 1ms soft-start eliminates the traditional startup stress.
Features
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Free-running borderline / critical mode quasi-resonant operation
Latched Over Voltage Protection
Auto-recovery short-circuit protection via UVLO crossover
External latch triggering, e.g. via over-temperature signal
Current-Mode with adjustable Skip-cycle capability
Internal 1ms soft-start
Internal temperature shutdown
Internal Leading Edge Blanking
500mA peak current source/sink capability
Under Voltage Lockout level of 12.5V (on) and 7.5V (min)
Direct optocoupler connection
SPICE models available for TRANsient analysis
Internal minimum TOFF
Auxiliary power supplies (USB, appliances, TVs etc.)
Pb-Free Packages are Available
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