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General Description
CX7156 is a high performance, highly integrated AC/DC
power supply control device which is operating in primary side
sensing and regulation. The device operates at PFM in CC
mode and at PWM+PFM in CV mode to achieve excellent
regulation and high efficiency without requiring an
opto-coupler and secondary control circuitry.
CX7156 has built-in line voltage compensation for CC mode
and cable drop compensation for CV mode without external
components, so that it can provide excellent CC and CV
performance.
CX7156 includes an internal power BJT, which can further
lower system cost. It has a number of key built-in functions
and protection features, so that it can minimize the external
component count, simplify EMI design and lower the total bill
of material cost.
Applications
 Cell Phone Charger
 Low Power Adaptor
 Auxiliary Power for PC, TV etc.
 LED Driver
Features
 Primary Side Regulation eliminates Opto-coupler and
secondary CV/CC control circuitry
 Multi-mode operation for highest overall efficiency
 ± 5% Constant Voltage and high precision Constant
Current regulation at universal AC Input
 No-load power consumption <150mW at 230Vac with
typical application circuit
 Internal 850V bipolar junction transistor (BJT)
 Max output power 6W
 Built-in Soft-Start circuit
 Built-in Cable Drop Compensation
 Low Start-up current (Max.5uA)
 Built-in Frequency jitter easily meets global EMI
standards
 Built-in Short Circuit Protection, output Over Voltage
Protection, Auxiliary line Open Protection
 Built-in Over Temperature Protection (OTP)
 Built-in Leading Edge Blanking (LEB)
 Cycle-by-Cycle current limiting
 Dynamic base current control
 VDD Under Voltage Lockout (UVLO) with hysteresi