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PT4201_DS Rev EN_2.1 PT4201 GENERAL DESCRIPTION
PT4201 is a highly integrated current mode PWM
controller
，
providing low standby power and cost
effective system solution for the sub 30W flyback
converter applications. It is also suitable for high
precision and high reliable LED lighting applications.
It features power saving oper
ation at no load or light
load condition, PWM frequency is reduced to minimize
switching loss and low standby power and high
efficiency is thus achieved. PT4201 also features low
VDD startup current which also contributes to low
standby power. The built in LEB on the current sense
input removes the signal glitch due to snubber circuit
diode reverse recovery thus reduce the external
component count and system cost in the design.
Rich protection is implemented in PT4201 including
cycle-by-cycle current limiting (OCP), over load
protection (OLP), VDD over voltage clamp and under
voltage lockout (UVLO). Gate drive output is clamped
at 18V to protect the power MOSFET. By limiting the
minimum frequency above 22 kHz eliminates the
potential audible noise when the system works under
light or no load conditions.
Excellent EMI performance is achieved with
C.R.PowTech proprietary frequency Jittering technique
together with soft driving control at totem pole gate
drive output.
The PT4201 is available in SOT23-6, SOP-8 and DIP-8
packages.
FEATURES
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Frequency Jittering for Improved EMI
Performance
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Green-Mode PWM for Improved Efficiency and
Minimum standby power design
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Low start up current 20uA ( Typ. 3uA) and Low
operation current 2mA (Typ. 1mA)
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Current mode operation
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Leading-edge blanking on current sense input
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Programmable PWM frequency
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Constant output power limit for universal AC
input
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Built-in power limit control (OLP)
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Cycle-by-cycle current limiting (OCP)
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Under voltage lockout (UVLO)
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GATE output maximum voltage clamped at 18V
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Totem pole output includes soft driving for
better EMI
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RoHS compliant
APPLICATIONS
Offline AC/DC flyback converter for
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Power Adapter
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Open-frame SMPS
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Battery Charger Adapter
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1W-30W HB LED lighting.
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