NCP1234: Controller, Fixed Frequency, Current Mode, for Flyback Converters
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NCP1234 is a new fixed-frequency current-mode controller featuring Dynamic Self-Supply (DSS). This device is pin-to-pin compatible with the previous NCP12xx families.
The DSS function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal startup current source to supply the controller during transients.
Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for converters where component cost is the key constraint.
It features a timer-based fault detection that ensures the detection of overload independently of an auxiliary winding, and an adjustable compensation to help keep the maximum power independent of the input voltage.
The DSS function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal startup current source to supply the controller during transients.
Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for converters where component cost is the key constraint.
It features a timer-based fault detection that ensures the detection of overload independently of an auxiliary winding, and an adjustable compensation to help keep the maximum power independent of the input voltage.
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Technical Documentation & Design Resources
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Application Diagram
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Interactive Block Diagram
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| NCP1234AD100R2G | Active |
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NCP1234 | SOIC-7 | 751U | 1 | 260 | Tape and Reel | 2500 | $0.424 | ||||||||
| NCP1234AD65R2G | Active |
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NCP1234 | SOIC-7 | 751U | 1 | 260 | Tape and Reel | 2500 | $0.424 | ||||||||
| NCP1234BD100R2G | Active |
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NCP1234 | SOIC-7 | 751U | 1 | 260 | Tape and Reel | 2500 | $0.424 | ||||||||
| NCP1234BD65R2G | Active |
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NCP1234 | SOIC-7 | 751U | 1 | 260 | Tape and Reel | 2500 | $0.424 | ||||||||
| Market Leadtime (weeks) | : | Contact Factory |
| Market Leadtime (weeks) | : | Contact Factory |
| PandS (2020-09-14 00:00) | : | >1K |
| Market Leadtime (weeks) | : | Contact Factory |
| PandS (2020-09-14 00:00) | : | >1K |
| Market Leadtime (weeks) | : | Contact Factory |
| PandS (2020-09-14 00:00) | : | >1K |
Product
Description
Pricing ($/Unit)
Compliance
Status
Topology
Control Mode
fsw Typ (kHz)
Stand-by Mode
UVLO (V)
Short Circuit Protection
Latch
Soft Start
VCC Max (V)
Drive Cap. (mA)
Package Type
NCP1234AD100R2G
$0.424
Pb
A
H
P
Active
Flyback
Current Mode
100
Yes
9.5
Yes
Yes
Yes
28
500 / 500
SOIC-7
NCP1234AD65R2G
$0.424
Pb
A
H
P
Active
Flyback
Current Mode
65
Yes
9.5
Yes
Yes
Yes
28
500 / 500
SOIC-7
NCP1234BD100R2G
$0.424
Pb
A
H
P
Active
Flyback
Current Mode
65
Yes
9.5
Yes
Yes
Yes
28
500 / 500
SOIC-7
NCP1234BD65R2G
$0.424
Pb
A
H
P
Active
Flyback
Current Mode
65
Yes
9.5
Yes
Yes
Yes
28
500 / 500
SOIC-7
Application
Diagram - Block
| Support |