UC2843 ,CURRENT MODE PWM CONTROLLERSupport &Product Order Tools &TechnicalCommunityFolder Now Documents SoftwareUC1842,UC2842,UC3842,U ..
UC2843A ,Linear High-Performance Current Mode ControllerUC284XAUC384XAHIGH PERFORMANCE CURRENT MODE PWM CONTROLLERNOT FOR NEW DESIGN1
UC2843AD ,Current Mode PWMsThermal CharacteristicsD Suffix, Plastic PackageMaximum Power Dissipation @ T = 25°C P 862 mWA DThe ..
UC2843AD1 ,Linear High-Performance Current Mode ControllerUC284XAUC384XAHIGH PERFORMANCE CURRENT MODE PWM CONTROLLERNOT FOR NEW DESIGN1
UC2843AD1013TR ,HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERBlock Diagram (toggle flip flop used only in UC3844A and UC3845A)7ViUVLO34V85VVREF5 S/RREFGROUND 5V ..
UC2843AD8 ,Current Mode PWM ControllerSupport &Product Order Tools &TechnicalCommunityFolder Now Documents SoftwareUC1842A,UC1843A,UC1844 ..
UM3750 , Programmable Encoder/Decoder
UM3750A , Programmable Encoder/Decoder
UM3750M , Programmable Encoder/Decoder
UM4407 , P-Ch 30V Fast Switching MOSFETs
UM4953 , Dual P-Ch 30V Fast Switching MOSFETs
UM5112 , 5-7.5 Watt SMD DC-DC Converters
UC2843-UC2843D-UC2843D8-UC2843D8TR-UC2843D8TRG4-UC2843DTR-UC2843DTRG4-UC2843N-UC2843N G4-UC2843NG4
CURRENT MODE PWM CONTROLLER
VIN
VCC
VREF
RT/CT
GROUND
VFB
ISENSE
OUTPUT
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UC1842, UC2842, UC3842, UC1843, UC2843, UC3843
UC1844, UC2844, UC3844, UC1845, UC2845, UC3845SLUS223E –APRIL 1997–REVISED JANUARY
UCx84x Current-Mode PWM Controllers Features Optimized for Off-Line and DC-to-DC Converters Low Start-Up Current(<1 mA) Automatic Feedforward Compensation Pulse-by-Pulse Current Limiting Enhanced Load-Response Characteristics Undervoltage Lockout With Hysteresis Double-Pulse Suppression High-Current Totem-Pole Output Internally Trimmed Bandgap Reference Upto 500-kHz Operation Error Amplifier With Low Output Resistance
Applications Switching Regulatorsof Any Polarity Transformer-Coupled DC-DC Converters
DescriptionThe UCx84x series of control integrated circuits
provide the features that are necessaryto implement
off-line or DC-to-DC fixed-frequency current-mode
control schemes, witha minimum numberof external
components. The internally implemented circuits
include an undervoltage lockout (UVLO), featuringa
start-up currentof less than1 mA, anda precision
reference trimmed for accuracyat the error amplifier
input. Other internal circuits include logicto ensure
latched operation,a pulse-width modulation (PWM)
comparator that also provides current-limit control,
anda totem-pole output stage thatis designedto
sourceor sink high-peak current. The output stage,
suitable for driving N-channel MOSFETs,is low whenisin theoff state.
The UCx84x family offersa variety of package
options, temperature range options, choice
maximum duty cycle, and choiceof turnon and turnoff
thresholds and hysteresis ranges. Devices
higher turnonor turnoff hysteresis are ideal choices
for off-line power supplies, while the devices with
narrower hysteresis range are suited for DC-DC
applications. The UC184x devices are specified
operation from –55°Cto 125°C, the UC284x series
specified for operation from –40°Cto 85°C, and
UC384x seriesis specified for operation from 0°C
70°C.
Device Information(1)(1) Forall available packages, see the orderable addendum
the endofthe datasheet.
Simplified Application
