UC3845AD8TR

ActivePower Supply Controllers, MonitorsD

IC REG CTRLR MULT TOPOLOGY 8SOIC

UC3845AD8TR 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

Datasheet-verified parameters

20 items

Parameter	Value and test conditions	Source
Package	D (SOIC, 8), 4.90mm × 6.00mm
Operating free-air temperature	0°C to 70°C (UC384xA)
Grade	Catalog
Supply voltage	Min: -, Nom: 11 V, Max: - (VCC pin)
Absolute Maximum Supply Voltage	Max: 30 V (VCC pin)
Reference Output Voltage	Min: 4.9 V, Typ: 5 V, Max: 5.1 V (TJ=25°C, IO=1 mA, UC384xA)
Reference Output Short Circuit Current	Min: -30 mA, Typ: -100 mA, Max: -180 mA
Oscillator Initial Accuracy	Min: 47 kHz, Typ: 52 kHz, Max: 57 kHz (TJ=25°C)
Oscillator Discharge Current	Min: 7.6 mA, Max: 8.8 mA (V_RT/CT=2 V, UC384xA)
Maximum Oscillator Frequency	Max: 500 kHz
Output Driver Current	Max: ±1 A (I_OUT)
UVLO ON Voltage	8.4 V (UC3845A)
UVLO OFF Voltage	7.6 V (UC3845A)
Maximum Duty Cycle	<50% (UC3845A)
Start-Up Current	< 0.5 mA
Junction Temperature	Min: -55°C, Max: 150°C (T_J)
Storage Temperature	Min: -65°C, Max: 150°C (T_stg)
ESD (HBM)	±2000 V
ESD (CDM)	±1500 V
Power Dissipation	Max: 1 W (at TA ≤ 25°C)

All parameters (13)ExpandCollapse

Power
Current - Supply	11 mA
Voltage - Input	-0.3V ~ 6.3V
Voltage - Supply	7.6V ~ 30V
Environment and package
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 70°C (TA)
Package	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®
Package / Case	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package	8-SOIC
Other
Applications	PWM Controller
Base Product Number	UC3845
Mfr	Texas Instruments
Product Status	Active
Series	UCx84xA

Pinout and package

Figure 4-1. CDIP, PDIP, and SO… — Package: **D (SOIC, 8), 4.90mm × 6.00mm**

Pin	Name	Function	Source
1		COMP: Error amplifier output, PWM comparator input
2		FB: Error amplifier input, voltage feedback loop
3		ISENSE: Peak current limit input, PWM comparator input
4		RT/CT: Internal oscillator input, timing resistor and capacitor
5		GND: Controller signal ground
6		OUTPUT: 1-A totem pole gate driver output
7		VCC: Gate driver bias input
8		VREF: Reference voltage output

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DatasheetDatasheet · 3.3 MB · 2026-10-29

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