Description
The 3842/43/44/45 are fixed frequency current mode PWM controller.
Line and DC to DC converter applications with a minimal external components.
Features
- Low Start-Up and Operating Current.
- High Current Totem Pole Output.
- Undervoltage Lockout With Hysteresis.
- Operating Frequency Up To 500KHz
Pin Connection
Block diagram
(toggle flip flop used only in 3844, 3845)
Top view
V
R
T
Absolute Maximum Ratings
Symbol
Parameter
VCC IO VI ISINK (E. A) Po Tstg TL TA
Supply Voltage (low impedance source) Output Current Input Voltage (Analog Inputs pins 2,3) Error Amp Output Sink Current Power Dissipation (TA=250C.
UC3844 Datasheet
