Housed in a SOIC-7 or PDIP-7 package, the NCP1217 represents the second generation of NCP1203-based controllers. Thanks to its high drive capability, NCP1217 drives large gate-charge MOSFETs, which together with internal ramp compensation and built-in over voltage protection, ease the design of modern AC/DC adapters. NCP1217 offers a true alternative to UC384X-based designs.
With an internal structure operating at different fixed frequencies (65, 100, 133kHz), the controller features a high-voltage start-up FET, which ensures a clean and loss less startup sequence. Its current-mode control topology provides an excellent input audio-susceptibility and inherent pulse-by-pulse control. Internal ramp compensation easily prevents subharmonic oscillations from taking place in continuous conduction mode designs.
When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the so-called skip cycle mode and provides excellent efficiency at light loads. Because this occurs at a user adjustable low peak current, no acoustic noise takes place.
The NCP1217 features two efficient protective circuitries: 1) in presence of an over-current condition, the output pulses are disabled and the device enters a safe burst mode, trying to re-start. Once the default has gone, the device auto-recovers. 2) if an external signal (e.g. a temperature sensor) pulls pin1 above 3.2V, output pulses are immediately stopped and the NCP1217 stays latched in this position. Reset occurs when the VCC collapses to ground, e.g. the user un-plugs the power supply.
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产品
NCP1217AD100R2G
Obsolete
Pb
A
H
P
SOIC-8
1
260
REEL
2500
N
Flyback
Current Mode
100
Yes
Yes
Yes
Yes
Yes
16
500
Price N/A
More Details
NCP1217AD133R2G
Obsolete
Pb
A
H
P
SOIC-8
1
260
REEL
2500
N
Flyback
Current Mode
133
Yes
Yes
Yes
Yes
Yes
16
500
Price N/A
More Details
NCP1217AD65R2G
Last Shipments
Pb
A
H
P
SOIC-8
1
260
REEL
2500
N
Flyback
Current Mode
65
Yes
Yes
Yes
Yes
Yes
16
500
Price N/A
More Details
NCP1217AP100G
Obsolete
Pb
A
H
P
PDIP-8
NA
0
TUBE
50
N
Flyback
Current Mode
100
Yes
Yes
Yes
Yes
Yes
16
500
Price N/A
More Details
NCP1217AP133G
Obsolete
Pb
A
H
P
PDIP-8
NA
0
TUBE
50
N
Flyback
Current Mode
133
Yes
Yes
Yes
Yes
Yes
16
500
Price N/A
More Details
NCP1217AP65G
Last Shipments
Pb
A
H
P
PDIP-8
NA
0
TUBE
50
N
Flyback
Current Mode
65
Yes
Yes
Yes
Yes
Yes
16
500
Price N/A
More Details
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