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See Technical Specifications

UCC3809D-1 +BOM

Economy primary side controller with 10V/8V UVLO, 0C to 70C

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

UCC3809D-1
Datasheet:

UCC3809D-1 Datasheet (PDF)
Output Isolation:

Isolated
Internal Switch(s):

No
Topology:

Boost, Buck, Flyback, Forward
Voltage - Start Up:

15 V
EDA/CAD Models:

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UCC3809D-1 General Description

The UCC3809 family of BCDMOS economy low power integrated circuits contains all the control and drive circuitry required for off-line and isolated DC-to-DC fixed frequency current mode switching power supplies with minimal external parts count. Internally implemented circuits include undervoltage lockout featuring startup current less than 100µA, a user accessible voltage reference, logic to ensure latched operation, a PWM comparator, and a totem pole output stage to sink or source peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state.

Oscillator frequency and maximum duty cycle are programmed with two resistors and a capacitor. The UCC3809 family also features full cycle soft start.

The family has UVLO thresholds and hysteresis levels for off-line and DC-to-DC systems as shown in the table to the left.

The UCC3809 and the UCC2809 are offered in the 8 pin SOIC (D), PDIP (N), TSSOP (PW), and MSOP (P) packages. The small TSSOP and MSOP packages make the device ideal for applications where board space and height are at a premium.

Key Features

User Programmable Soft Start With Active Low Shutdown
User Programmable Maximum Duty Cycle
Accessible 5V Reference
Undervoltage Lockout
Operation to 1MHz
0.4A Source/0.8A Sink FET Driver
Low 100µA Startup Current

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)AC DC Converters, Offline Switches	Series	-
Output Isolation	Isolated	Internal Switch(s)	No
Voltage - Breakdown	-	Topology	Boost, Buck, Flyback, Forward
Voltage - Start Up	15 V	Voltage - Supply (Vcc/Vdd)	8V ~ 19V
Duty Cycle	70%	Frequency - Switching	1MHz
Fault Protection	-	Control Features	Frequency Control, Soft Start
Operating Temperature	-55°C ~ 150°C (TJ)	Mounting Type	Surface Mount
Base Product Number	UCC3809