NCP1256ESN65T1G
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onsemi NCP1256ESN65T1G

Manufacturer No:
NCP1256ESN65T1G
Manufacturer:
onsemi
Package:
Tape & Reel (TR)
Description:
IC OFFLINE SWITCH FLYBACK 6TSOP
Delivery:
Payment:
iso14001
iso45001
iso9001
iso13485

Product Introduction

Overview

The NCP1256ESN65T1G, produced by onsemi, is a low power offline PWM current mode controller designed for building cost-effective switch mode power supplies. This component is housed in a compact TSOP-6 package and can be supplied up to 30 V. It operates at a fixed frequency of 65 kHz and features several protection mechanisms, including brown-out protection, over power protection (OPP), and short circuit protection. The NCP1256ESN65T1G is ideal for applications requiring low part-count and cost-effectiveness, such as ac-dc adapters for portable devices and auxiliary power supplies.

Key Specifications

ParameterMinTypMaxUnit
VCCON (VCC increasing level)161820V
VCC(min) (VCC decreasing level)8.38.99.5V
VCCHYST (Hysteresis VccON-Vcc(min))8.4-9.25V
ICC1 (Start-up current)57.5-μA
fOSC,nom (Oscillation Frequency)616570kHz
Dmax (Maximum duty ratio)778083%
fjitter (Frequency jittering)--±5%

Key Features

  • Fixed-frequency 65 kHz current-mode control operation
  • Adjustable Over Power Protection (OPP) circuit, disabled at low line
  • Adjustable Brown Out (BO) level
  • Frequency foldback down to 26 kHz and skip-cycle in light load conditions
  • Internally-fixed slope compensation ramp
  • Internally-fixed 4 ms soft-start
  • 70 ms timer-based auto-recovery short-circuit protection
  • Frequency jittering in normal and frequency foldback modes
  • Double hiccup auto-recovery short-circuit protection
  • Pre-short ready for latched OCP option
  • Latched/auto-recovery OVP protection on Vcc
  • Latched inputs for improved robustness (OVP and OTP implementations)
  • Auto-recovery ac line OVP protection (E version)
  • +500 mA/ -500 mA source/sink drive capability
  • EPS 2.0 compliant and Pb-free device

Applications

  • Ac-dc adapters for portable devices, computers, tablets, etc.
  • Auxiliary power supplies
  • Open-frame power supplies

Q & A

  1. What is the operating frequency of the NCP1256ESN65T1G?
    The NCP1256ESN65T1G operates at a fixed frequency of 65 kHz.
  2. What is the maximum supply voltage for the NCP1256ESN65T1G?
    The maximum supply voltage is up to 30 V.
  3. What protection features does the NCP1256ESN65T1G include?
    The component includes brown-out protection, over power protection (OPP), short circuit protection, and OVP/OTP protection.
  4. How does the frequency foldback feature work?
    The controller reduces the switching frequency down to 26 kHz in light load conditions and enters skip-cycle mode when the feedback pin voltage drops below 0.75 V.
  5. What is the purpose of the internal soft-start?
    The internal soft-start, fixed at 4 ms, prevents the main power switch from being stressed during startup and reduces output voltage overshoots.
  6. Is the NCP1256ESN65T1G compliant with any specific standards?
    Yes, it is EPS 2.0 compliant and a Pb-free device.
  7. What is the maximum duty ratio of the NCP1256ESN65T1G?
    The maximum duty ratio is up to 83%.
  8. How does the short circuit protection work?
    The component features a 70 ms timer-based auto-recovery short-circuit protection and a double hiccup auto-recovery mode.
  9. What is the function of the BO/OVP pin?
    The BO/OVP pin adjusts the brown-out level and serves as a latch input for OVP events.
  10. What is the significance of the E version of the NCP1256?
    The E version includes an auto-recovery ac line OVP protection.

Product Attributes

Output Isolation:Isolated
Internal Switch(s):No
Voltage - Breakdown:- 
Topology:Flyback
Voltage - Start Up:18 V
Voltage - Supply (Vcc/Vdd):8.9V ~ 28V
Duty Cycle:80%
Frequency - Switching:65kHz
Power (Watts):- 
Fault Protection:Over Power, Over Voltage, Short Circuit
Control Features:- 
Operating Temperature:-40°C ~ 125°C (TJ)
Package / Case:SOT-23-6 Thin, TSOT-23-6
Supplier Device Package:6-TSOP
Mounting Type:Surface Mount
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In Stock

$0.27
1,909

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Similar Products

Part Number NCP1256ESN65T1G NCP1256ASN65T1G NCP1256BSN65T1G
Manufacturer onsemi onsemi onsemi
Product Status Active Active Active
Output Isolation Isolated Isolated Isolated
Internal Switch(s) No No No
Voltage - Breakdown - - -
Topology Flyback Flyback Flyback
Voltage - Start Up 18 V 18 V 18 V
Voltage - Supply (Vcc/Vdd) 8.9V ~ 28V 8.9V ~ 28V 8.9V ~ 28V
Duty Cycle 80% 80% 80%
Frequency - Switching 65kHz 65kHz 65kHz
Power (Watts) - - -
Fault Protection Over Power, Over Voltage, Short Circuit Over Power, Over Voltage, Short Circuit Over Power, Over Voltage, Short Circuit
Control Features - - -
Operating Temperature -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ)
Package / Case SOT-23-6 Thin, TSOT-23-6 SOT-23-6 Thin, TSOT-23-6 SOT-23-6 Thin, TSOT-23-6
Supplier Device Package 6-TSOP 6-TSOP 6-TSOP
Mounting Type Surface Mount Surface Mount Surface Mount

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