Figure 4-1. CDIP, PDIP, and SO…

Figure 4-1. CDIP, PDIP, and SO…

Texas InstrumentsUnited States

UC3845AD8

ActiveDC DC Switching ControllersD

IC REG CTRLR MULT TOPOLOGY 8SOIC

UC3845AD8 is a current-mode PWM controller for off-line and DC-DC converters, with a maximum switching frequency of 500kHz, in an SOIC-8 package, operating from 0°C to 70°C.Checked against the datasheet

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Technical parameters

Key specs

TopologyFlyback
Outputs1
Input voltage11 ~ 30 V
Switching frequency500 kHz

Datasheet-verified parameters

20 items
ParameterValue and test conditionsSource
TopologyCurrent-Mode PWM
Outputs1
Input Voltage RangeVCC pin: Min - V, Max 30 V (Absolute Maximum); Recommended VCC: Nom 11 V
Switching FrequencyMax 500 kHz
PackageD (SOIC, 8)
Operating Temperature0°C to 70°C
GradeCatalog
Reference Output VoltageMin 4.9 V, Typ 5 V, Max 5.1 V (TJ=25°C, IO=1 mA)
Reference Output Short Circuit CurrentMin -30 mA, Typ -100 mA, Max -180 mA
Oscillator Initial AccuracyMin 47 kHz, Typ 52 kHz, Max 57 kHz (TJ=25°C)
Oscillator Discharge CurrentMin 7.6 mA, Max 8.8 mA (V_RT/CT=2 V, UC384xA)
UVLO On Voltage8.4 V
UVLO Off Voltage7.6 V
Maximum Duty Cycle<50%
Start-Up Current< 0.5 mA
Output Drive CurrentUp to 1 A (Sink and Source)
Absolute Maximum Rating: Supply VoltageMax 30 V (VCC pin)
Absolute Maximum Rating: Junction TemperatureMin -55°C, Max 150°C
Recommended Operating Condition: Supply VoltageNom 11 V (VCC pin)
Recommended Operating Condition: Oscillator FrequencyMax 500 kHz
All parameters (22)ExpandCollapse
Power
Voltage - Supply (Vcc/Vdd)7.6V ~ 30V
AC and DC characteristics
Frequency - SwitchingUp to 500kHz
Environment and package
Mounting TypeSurface Mount
Operating Temperature0°C~70°C(TA)
PackageTube
Package / Case8-SOIC (0.154", 3.90mm Width)
Supplier Device Package8-SOIC
Other
Base Product NumberUC3845
Clock SyncNo
Control FeaturesFrequency Control
Duty Cycle (Max)48%
FunctionStep-Up, Step-Down, Step-Up/Step-Down
MfrTexas Instruments
Number of Outputs1
Output ConfigurationPositive, Isolation Capable
Output Phases1
Output TypeTransistor Driver
Product StatusActive
Serial Interfaces-
Series-
Synchronous RectifierNo
TopologyBoost, Buck, Flyback, Forward

Pinout and package

Figure 4-1. CDIP, PDIP, and SO…
Figure 4-1. CDIP, PDIP, and SO…
Package: D (SOIC, 8)
PinNameFunctionSource
1COMP: Error amplifier output, PWM comparator input
2FB: Error amplifier input, voltage feedback loop control
3ISENSE: Peak current limit input, PWM comparator input
4RT/CT: Internal oscillator input, programmed with external timing resistor and capacitor
5GND: Controller signal ground
6OUTPUT: 1-A totem pole gate driver output
7VCC: Gate driver bias input
8VREF: Reference voltage output

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DatasheetDatasheet · 3.3 MB · 2026-10-29
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