NCP1251BSN65T1G AC-DC Power Conversion by ON Semiconductor

PWM Controller, Current Mode, for Offline Power Supplies

Status: Active
Series: NCP1251
RoHS: Compliant
View Datasheet Manufacturer Site View Pricing & Stock

The NCP1251 is a highly integrated PWM controller capable of delivering a rugged and high performance offline power supply in a tiny TSOP-6 package. With a supply range up to 28 V, the controller hosts a jittered 65 kHz or 100 kHz switching circuitry operated in peak current mode control. When the power on the secondary side starts to decrease, the controller automatically folds back its switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current. Over Power Protection (OPP) is a difficult exercise especially when no-load standby requirements drive the converter specifications. The ON proprietary integrated OPP lets you harness the maximum delivered power without affecting your standby performance simply via two external resistors. A latched Over Voltage Protection (OVP) is combined on the same pin. For ease of implementation, an auto-recovery OVP also monitors the Vcc line. These features offer an efficient protection in case of optocoupler failure or adverse open loop operation. Finally, a timer-based short-circuit protection offers the best protection scheme, letting you precisely select the protection trip point irrespective of a loose coupling between the auxiliary and the power windings.

Prices starting from US$0.07


Distributor Starting From Stock
Logo for Avnet Asia Avnet Asia US$0.27
30,000
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Logo for element14 element14 US$0.28
4,755
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Logo for Newark Electronics Newark Electronics US$0.07
1,391
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Logo for Future Electronics Future Electronics US$0.26
-
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Logo for Avnet America Avnet America US$0.28
-
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Logo for EBV Elektronik EBV Elektronik -
-
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Logo for Avnet Silica Avnet Silica -
-
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Features

Non-dissipative internal and adjustable Over Power Protection (OPP)
Frequency Foldback down to 26 kHz and Skip-Cycle in light load conditions
Internal Ramp Compensation
Frequency jittering from full load to skip-cycle
Latch input for OVP and OTP implementations
Over Voltage Protection (OVP) monitoring on the Vcc pin
See NCP1250 for no Over Voltage Protection (OVP) on the Vcc pin
Benefits
Limits maximum delivered power without affecting standby performance
High efficiency in light load conditions
Reduces the number of external components
Improved EMI performance
Simple implementation of required protection functions
Protects against output over voltage conditions without any added components
Applications
Offline Adapters
45W Adapter
Printers
End Products
AC-DC converters
Set-top Boxes
Notebooks and Netbooks

Specifications

Description NCP1251
Compliance Pb-free Halide free
Topology Flyback
Control Mode Current Mode
fsw Typ (kHz) 65
Stand-by Mode Yes
UVLO (V) 8.8
Short Circuit Protection Yes
Latch OVP
Soft Start Yes
VCC Max (V) 28
Drive Cap. (mA) 300 / 500
Package Type TSOP-6

Alternative Descriptions

Current Mode PWM Controller 500mA 6-Pin TSOP T/R | Avnet Asia
PWM CONTROLLER, 65KHZ, 28V, TSOP-28 | Farnell Contract
Pwm Contr, Current-Mode, 28V, Tsop-6 | Newark Electronics
OCP AUTO OVP VCC LATCH | Future Electronics


Frequently Asked Questions

Where can I find additional details, specifications and documents for a NCP1251BSN65T1G?

Additional datasheets, footprints and schematics for NCP1251BSN65T1G are listed on our Part Details page. You can also find images and similar parts to NCP1251BSN65T1G on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for NCP1251BSN65T1G on our Product Comparison page. Access via the 'View Pricing & Stock' button to view NCP1251BSN65T1G price breaks, MOQs, lead times, inventory and SKUs from distributors.

What category does NCP1251BSN65T1G fall under?

The NCP1251BSN65T1G is listed under Power Management > AC-DC Power Conversion > Offline Controllers.

Can I view similar or alternative parts?

You can view similar parts to NCP1251BSN65T1G when available in the Offline Controllers range under the specifications section at the bottom of the details page.

Who can I contact for technical support of the product?

Submit any questions directly to the customer support team of the distributor listing the product. For the NCP1251BSN65T1G you can contact the distributor directly for product support, shipping queries etc.

Is the NCP1251BSN65T1G RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by ON Semiconductor.

Which authorised distributors for NCP1251BSN65T1G have stock available?

Authorised distributors including Avnet Asia, Farnell Contract, element14, Newark Electronics and Future Electronics have stock available or on a lead time for NCP1251BSN65T1G.

How do I check stock and lead times for all distributors?

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