NCP1256

Low Power Offline PWM Current Mode Controller with Brown-Out Protection

Overview

The NCP1256 includes everything to build cost-effective switch mode power supplies ranging from a few watts up to several tens of watts. Housed in a tiny TSOP-6 package, the part can be supplied up to 30 V. It hosts a jittered 65 or 100-kHz switching circuitry operated in peak current mode control. When the power in 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. NCP1256 comes with several protection features such as a timer-based auto-recovery short circuit protection, lossless OPP, and an easily adjustable Brown Out (BO) pin. Two inputs are provided to latch off the part in a practical way, for instance with OVP and OTP events. Several options exists to chose latch or auto-recovery.

Applications

Ac−dc Adapters for Portable Devices
Ac−dc Adapters for Computers
Ac−dc Adapters for Tablets
General Ac−dc Adapters

End Products

Ac-dc Adapters

Features

Frequency Foldback down to 26 kHz and Skip−cycle in Light Load Conditions
70−ms Timer−based Auto−recovery Short−circuit Protection
Frequency Jittering in Normal and Frequency Foldback Modes
+500 mA/ −500 mA Source/Sink Drive Capability
Fixed−frequency 65−kHz or 100−kHz Current−mode Control Operation
Pb−Free Device
Adjustable Over Power Protection (OPP) Circuit, Disabled at Low Line
Adjustable Brown Out Level
Internally−fixed Slope Compensation Ramp
Internally−fixed 4−ms Soft−start
Double Hiccup Auto−recovery Short−circuit Protection
Pre−short Ready for Latched OCP Option
Latched OVP Protection on Vcc
Latched Inputs for Improved Robustness (OVP and OTP implementations)
EPS 2.0 Compliant

Material Composition

Product Change Notification

Product List

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CAD Models

Compliance

Package Type

Case Outline

MSL Type

MSL Temp (°C)

Container Type

Container Qty.

Topology

Control Mode

f_sw Typ (kHz)

Stand-by Mode

UVLO (V)

Short Circuit Protection

Latch

Soft Start

V_CC Max (V)

Drive Cap. (mA)

Reference Price

NCP1256ASN100T1G

Active

TSOP-6

318G-02

260

REEL

3000

Flyback

Current Mode

100

Yes

8.3

Yes

500 / 500

$0.2133

NCP1256ASN65T1G

Active

TSOP-6

318G-02

260

REEL

3000

Flyback

Current Mode

Yes

8.3

Yes

500 / 500

$0.2133

NCP1256BSN100T1G

Obsolete

TSOP-6

318G-02

260

REEL

3000

Flyback

Current Mode

100

Yes

8.3

Yes

500 / 500

Price N/A

NCP1256BSN65T1G

Active

TSOP-6

318G-02

260

REEL

3000

Flyback

Current Mode

Yes

8.3

Yes

500 / 500

$0.2133

NCP1256ESN65T1G

Active

TSOP-6

318G-02

260

REEL

3000

Flyback

Current Mode

Yes

8.3

Yes

500 / 500

$0.2347

Product Number:

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Offline Controllers | NCP1256

Low Power Offline PWM Current Mode Controller with Brown-Out Protection

Overview

Product List

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