Description

Product details

The UTC UC3844/3845 are high performance fixed frequency current mode controllers that specifically designed for Off-Line and DC to DC converter applications with minimal external parts count. The differences between UC3844 and UC3845 are the under-voltage lockout thresholds. The UC3844 ideally suited to off-line applications with UVLO thresholds of 16V(ON) and 10V(OFF), and UC3845 has UVLO thresholds of 8.4V(ON) and 7.6V(OFF) for lower voltage applications.  FEATURES * Operation output switching frequency up to 500 kHz * Automatic feed forward compensation * Latching PWM for cycle-by-cycle current limiting * High current totem pole output * Internally trimmed reference with under voltage lockout * UVLO with hysteresis * Low startup and operating current

Keywords

• 500 kHz
• The UTC
• The UC3844
• Low startup
• Latching PWM
• UVLO thresholds
• voltage lockout
• current limiting
• line applications
• current mode controllers
• lower voltage applications
• minimal external parts count
• High current totem pole output
• high performance fixed frequency
• Automatic feed forward compensation
• Operation output switching frequency