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NCP1561DR2
Dual Output PWM Controller
NCP1561
Push-Pull PWM Controller
for 48 V T elecom Systems
The NCP1561 Push−Pull PWM controller contains all the features
and flexibility needed to implement high efficiency dc−dc converters
using voltage or current−mode control. This device can be configured
in any dual ended topology such as push−pull or half−bridge. It can
also be used for forward topologies requiring a 50% maximum duty
cycle. This device is ideally suited for 48 V telecom, 42 V automotive
systems and 12 V input applications.
The NCP1561 cost effectively reduce system part count by
incorporating a high voltage startup regulator, line undervoltage
detector, single resistor oscillator setting, dual mode overcurrent
protection, soft−start and single resistor feedforward ramp generator.
The oscillator frequency can be adjusted up to 250 kHz.
Features Internal High Voltage Startup Regulator Minimum Operating Voltage of 21.5 V Voltage or Current−Mode Control Capability Single Resistor Oscillator Frequency Setting Adjustable Frequency up to 250 kHz Fast Line Feedforward Line Undervoltage Lockout Dual Mode Overcurrent Protection Programmable Maximum Duty Cycle Control Maximum Duty Cycle Proportional to Line V oltage Programmable Soft−Start Precision 5.0 V Reference
Typical Applications 48 V Telecommunication Power Converters Industrial Power Converters 42 V Automotive Systems
Vin TX1
Startup
OUT2
