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UC3842QUNITRODEN/a32avai CURRENT-MODE PWM CONTROLLER


UC3842Q , CURRENT-MODE PWM CONTROLLERFeaturesThe UCx84x family offers a variety of package• Optimized for Off-Line and DC-to-DC Converte ..
UC3842T ,HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Supply Voltage (low impedance source) 30 ViV S ..
UC3842TN ,HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Supply Voltage (low impedance source) 30 ViV S ..
UC3843 ,SMPS ControllerUC3842/UC3843/UC3844/UC3845SMPS Controller
UC3843A ,Current mode PWM control circuit.3AN1080/DIf the efficiency is taken into account and it is assumed that L  1.66 mHpthe typical con ..
UC3843A ,Current mode PWM control circuit.features to implement off-line or DC toDC fixed frequency current mode control schemesDifferences b ..
UMX1NTN , General purpose transistors (dual transistors)
UMX1NTN , General purpose transistors (dual transistors)
UMX2N , General purpose (dual transistors)
UMX2N , General purpose (dual transistors)
UMX4 N , High transition frequency (dual transistors)
UMX4 NTR , Two 2SC3837K chips in a EMT or UMT or SMT package.


UC3842Q
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, UC3845

SLUS223E –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 Description
The 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.
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