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UC3843AUTCN/a11000avaiCurrent mode PWM control circuit.
UC3843AN/a117avaiCurrent mode PWM control circuit.
UC3843AD8ONN/a5avaiCurrent Mode PWM Controller
UC3843AD8TRUCCN/a857avaiCurrent Mode PWM Controller
UC3843AD8TRG4TIN/a5000avaiCurrent Mode PWM Controller
UC3843ADTRTIN/a5000avaiCurrent Mode PWM Controller
UC3843ADTRG4TIN/a2530avaiCurrent Mode PWM Controller 14-SOIC 0 to 70
UC3843ANG4TEXASN/a11avaiCurrent Mode PWM 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 ..
UC3843A ,Current mode PWM control circuit.
UC3843A ,Current mode PWM control circuit.
UC3843A ,Current mode PWM control circuit.UC284XAUC384XAHIGH PERFORMANCE CURRENT MODE PWM CONTROLLERNOT FOR NEW DESIGN1
UC3843A ,Current mode PWM control circuit.ELECTRICAL CHARACTERISTICS (V = 15 V, [Note 4], R = 10 k, C = 3.3 nF, T = T to T [Note 5],CC T T A ..
UMX4 N , High transition frequency (dual transistors)
UMX4 NTR , Two 2SC3837K chips in a EMT or UMT or SMT package.
UMX4N , High transition frequency (dual transistors)
UMX4NTR , Two 2SC3837K chips in a EMT or UMT or SMT package.
UMX5N , High transition frequency (dual transistors)
UMZ1 N , General purpose transistor (dual transistors)


UC3843A-UC3843AD8-UC3843AD8TR-UC3843AD8TRG4-UC3843ADTR-UC3843ADTRG4-UC3843ANG4
Current Mode PWM Controller 0-WAFERSALE
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UC1842A, UC1843A, UC1844A, UC1845A
UC2842A, UC2843A, UC2844A, UC2845A
UC3842A, UC3843A, UC3844A, UC3845A

SLUS224F –SEPTEMBER 1994–REVISED OCTOBER 2017
UCx84xA Current-Mode PWM Controller Features
Optimized for Off-Line and DC-DC Converters Low Start-Up Current(< 0.5 mA) Trimmed Oscillator Discharge Current 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 Createa Custom Design Using the UCx84xA With
the WEBENCH® Power Designer Applications Switch Mode Power Supplies (SMPS) DC-DC Converters Power Modules Industrial PSU Battery Operated PSU Description
The UCx84xA familyof control devicesisa pin-for-pin
compatible improved versionof the UCx84x family.
Providing the necessary featuresto control current-
modeor switched-mode power supplies, this family
devices has many improved features: startup current less than 0.5 mA, oscillator dischargeis trimmed
8.3 mA, and during UVLO, the output stage can least10 mAat less than 1.2V for VCC over5
Device Information(1)

(1) Forall available packages, see the orderable addendum
the endofthe data sheet.
Device Comparison Table
Simplified Application Diagram
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