General Description
The CR6853 is a highly integrated low cost
current mode PWM controller, which is ideal
for small power current mode of offline
AC-DC fly-back converter applications.
Making use of external resistors, the IC
changes the operating frequency and
automatically enters the PFM/CRM (Cycle
Reset Mode) under light-load/zero-load
conditions. This can minimize standby
power consumption and achieve powersaving
functions. With a very low start-up
current, the CR6853 could use a large value
start-up resistor (2M ).
Built-in synchronized slope compensation
enhances the stability of the system and
avoids sub-harmonic oscillation. Dynamic
peak current limiting circuit minimizes output
power change caused by delay time of the
system over a universal AC input range.
Leading edge blanking circuit on current
sense input could remove the signal glitch
due to snubber circuit diode reverse
recovery and thus greatly reduces the
external component count and system cost
in the design. Cycle-by-Cycle current
limiting ensures safe operation even during
short-circuit.
Excellent EMI performance is achieved
built-in soft driver and low EMI technique.
The CR6853 offers perfect protection like
OVP(Over Voltage Protection)、OLP(Over
Load Protection) 、SCP(Short circuit
protection)、OTP、Sense Fault Protection
and OCP(Over current protection). The
CR6853’s output driver is soft clamped to
maximum 18.0V to protect the power
MOSFET. CR6853 is offered in SOT-23-6L,
SOT-8 and DIP-8 packages.

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