UC2872DWTRG4 ,Resonant Lamp Ballast Controller 16-SOIC -40 to 85+applicationUC1872INFOUC2872availableUC3872Resonant Lamp Ballast Controller
UC2872N , Resonant Lamp Ballast Controller
UC2874DW-1 ,2UC1874-1,-2UC2874-1,-2UC3874-1,-2High Efficiency, Synchronous, Step-down (Buck) Controllers
UC2874DW-2 ,2MAXIMUM RATINGSSupply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36VDI ..
UC2874DW-2 ,2BLOCK DIAGRAMUDG-95005-1SLUS286A - FEBRUARY 1998 - REVISED OCTOBER 2001UC1874-1,-2UC2874-1,-2UC3874 ..
UC2874DW-2 ,2ELECTRICAL CHARACTERISTICS: Unless otherwise stated these specifications apply for TA = –55°C to +1 ..
UM91214B , Tone / Pulse Dialer
UM91214B , Tone / Pulse Dialer
UM91215D , Tone / Pulse Dialer
UM91260B , 10 MEMORY TONE /PULSE DIALER
UM91270/A , 20 MEMORY TONE/PULSE DIALER
UM91270A , 20 MEMORY TONE/PULSE DIALER
UC2872DW-UC2872DWG4-UC2872DWTRG4
Resonant Lamp Ballast Controller
UC1872
UC2872
UC3872
FEATURES Controls Different Types of Lamps:
Cold Cathode Fluorescent, Neon, and
Gas Discharge Zero Voltage Switching (ZVS) of
Push-Pull Drivers Accurate Control of Lamp Current Variable Lamp Intensity Control 1μA Disable Current 4.5V to 24V Operation Open Lamp Detection Circuitry
DESCRIPTIONThe UC3872isa resonant lamp ballast controller optimized for driving
cold cathode fluorescent, neon, and other gas discharge lamps. The res-
onant power stage developsa sinusoidal lamp drive voltage, and mini-
mizes switching loss and EMI generation. Lamp intensity adjustmentis
accomplished witha buck regulator, whichis synchronizedto the external
power stage’s resonant frequency. Suitable for automotive and battery
powered applications, the UC3872 draws only 1μA when disabled.
Soft start and open lamp detect circuitry have been incorporatedto mini-
mize component stresses. Open lamp detectionis enabledat the comple-
tionofa soft start cycle. The chipis optimized for smooth duty cycle
control to 100%.
Other features includea precision 1.2% reference, undervoltage lockout,
and accurate minimum and maximum frequency control.
Resonant Lamp Ballast Controller
BLOCK DIAGRAM
