NCP1256: Low Power Offline PWM Current Mode Controller with Brown-Out Protection

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.

特性
  • 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
  • Pb−Free Device
  • Fixed−frequency 65−kHz or 100−kHz Current−mode Control Operation
  • 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
优势
  • More efficient light load operation
  • Short circuit operation for safety yet reliable with auto-recovery for flexible restart
  • Jitter reduces EMI by spreading the switching sprectrum over a wider band
  • Ability to drive larger FETs
  • Environment friendly
应用
  • Ac−dc Adapters for Portable Devices
  • Ac−dc Adapters for Computers
  • Ac−dc Adapters for Tablets
  • General Ac−dc Adapters
终端产品
  • Ac-dc Adapters
应用注释 (3)
Document TitleDocument ID/SizeRevisionRevision Date
A 60 W AC-DC Demonstrator with NCP1256AND9206/D (367kB)2Jan, 2017
Standby Power Performance of NCP1256AND9208/D (428kB)0May, 2015
The NCP1256, a Tiny Controller for Offline ConvertersAND9207/D (829kB)0Jun, 2015
数据表 (1)
Document TitleDocument ID/SizeRevisionRevision Date
Low Power Offline PWM Current Mode Controller with Brown-Out ProtectionNCP1256/D (392kB)3Dec, 2015
评估板文档 (4)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1256B60WGEVB Bill of Materials ROHS CompliantNCP1256B60WGEVB_BOM_ROHS.pdf (97kB)0
NCP1256B60WGEVB Gerber layout Files (Zip Format)NCP1256B60WGEVB_Gerber.zip (233kB)0
NCP1256B60WGEVB SchematicNCP1256B60WGEVB_SCHEMATIC.pdf (313kB)0
NCP1256B60WGEVB Test ProcedureNCP1256B60WGEVB_TEST_PROCEDURE.pdf (78kB)0
封装图纸 (1)
Document TitleDocument ID/SizeRevision
TSOP-6318G-02 (64.1kB)V
评估板与开发工具
产品状况Compliance简短说明
NCP1256B60WGEVBActivePb-free60W, 19V Power Supply Evaluation Board
产品订购型号
产品状况Compliance封装MSL*容器预算价格 (1千个数量的单价)
NCP1256ASN100T1GActivePb-free Halide freeTSOP-6318G-023Tape and Reel3000$0.2133
NCP1256ASN65T1GActivePb-free Halide freeTSOP-6318G-023Tape and Reel3000$0.2133
NCP1256BSN100T1GActivePb-free Halide freeTSOP-6318G-023Tape and Reel3000$0.2133
NCP1256BSN65T1GActivePb-free Halide freeTSOP-6318G-023Tape and Reel3000$0.2133
订购产品技术参数
ProductTopologyControl Modefsw Typ (kHz)Stand-by ModeUVLO (V)Short Circuit ProtectionLatchSoft StartVCC Max (V)Drive Cap. (mA)
NCP1256ASN100T1GFlybackCurrent Mode100Yes8.3YesYesYes35500 / 500
NCP1256ASN65T1GFlybackCurrent Mode65Yes8.3YesYesYes35500 / 500
NCP1256BSN100T1GFlybackCurrent Mode100Yes8.3YesNoYes35500 / 500
NCP1256BSN65T1GFlybackCurrent Mode65Yes8.3YesNoYes35500 / 500
Low Power Offline PWM Current Mode Controller with Brown-Out Protection (392kB) NCP1256
A 60 W AC-DC Demonstrator with NCP1256 NCP1256
Standby Power Performance of NCP1256 NCP1256
The NCP1256, a Tiny Controller for Offline Converters NCP1256
NCP1256B60WGEVB BOM ROHS NCP1256B60WGEVB
NCP1256B60WGEVB Gerber NCP1256B60WGEVB
NCP1256B60WGEVB SCHEMATIC NCP1256B60WGEVB
NCP1256B60WGEVB TEST PROCEDURE NCP1256B60WGEVB
TSOP-6 STF202