Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - voltage regulators - DC DC switch controllers SOIC 8

UCC1809-1/-2

UCC2809-1/-2

UCC3809-1/-2

SLUS166B - NOVEMBER 1999 - REVISED NOVEMBER 2004

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

Economy Primary Side Controller

–

6µA

+5V

0.5V

OS C

–

REF

15/8V

10/8V

VDD

REF

VDD

–

REF

RT1

RT2

DISABLE

NO ISE

FILTER

SLOPE

COMP

CURRENT

SENSE

FEEDBACK

START

CLK

PWM

LATCH

UVLO

OUT

17.5V

OUT

GND

TYPICAL APPLICATION DIAGRAM

UDG-99036

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 ac

cessible voltage reference, logic to ensure latched operation, a PWM com

parator, 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.

PART

NUMBER

TURN ON

THRESHOLD

TURN OFF

THRESHOLD

UCCX809-1 10V 8V

UCCX809-2 15V 8V

application

INFO

available

Summary of content (20 pages)

PAGE 1
application INFO available UCC1809-1/-2 UCC2809-1/-2 UCC3809-1/-2 Economy Primary Side Controller FEATURES DESCRIPTION • User Programmable Soft Start With Active Low Shutdown 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.
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UCC1809-1/-2 UCC2809-1/-2 UCC3809-1/-2 CONNECTION DIAGRAM ABSOLUTE MAXIMUM RATINGS* VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19V IVDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA IOUT (tpw < 1µs and Duty Cycle < 10%) . . . . . . . . –0.4A to 0.8A RT1, RT2, SS . . . . . . . . . . . . . . . . . . . . . . –0.3V to REF + 0.3V IREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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UCC1809-1/-2 UCC2809-1/-2 UCC3809-1/-2 ELECTRICAL CHARACTERISTICS: Unless otherwise specified, CVREF = 0.47 mF, VDD = 12V. TA = TJ. PARAMETER Soft Start Section ISS TEST CONDITIONS VDD = 16V, VSS = 0V; –40°C to +85°C VDD = 16V, VSS = 0V; < –40°C; >+85°C VDD = 7.5V, ISS = 200mA VSS Low Shutdown Threshold Oscillator Section Frequency RT1 = 10k, RT2 = 4.
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C1 150 µF –VIN ON/OFF +VIN PGND1 R2 1.1K R1 5.1k C2 150 µF Q1 2N2222A C4 0.01 µF C5 1nF R3 12.1K TP1 PGND1 C3 1µF R4 6.19K R5 470 5 GND RT2 4 R18 3.01K Q4 2N2222A C22 0.1 µF R20 5.62K 6 OUT RT1 3 U1 VDD 7 SS 2 8 REF UCC3809 FB 1 C6 330pF C8 1µF D1 5231B C9 0.1 µF C7 0.47 µF R12 27K D4 1N5240 R9 2K 3W R6 1K R10 10 D2 1N5245 R11 680 Q2 2N2907A R13 1.1K 2 4 R7 15K C15 0.015 µF D3 SF24 R8 0.15 3W Q3 IRF640 5:1 R19 5.1K 3W C10 0.
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UCC1809-1/-2 UCC2809-1/-2 UCC3809-1/-2 APPLICATION INFORMATION (cont.) The Typical Application Diagram shows an isolated flyback converter utilizing the UCC3809. Note that the capacitors CREF and CVDD are local decoupling capacitors for the reference and IC input voltage, respectively. Both capacitors should be low ESR and ESL ceramic, placed as close to the IC pins as possible, and returned directly to the ground pin of the chip for best stability.
PAGE 6
UCC1809-1/-2 UCC2809-1/-2 UCC3809-1/-2 APPLICATION INFORMATION (cont.) CT CT CHARGING DIS CHARGING 3.33V 1.67V CT S (OS C) R(OS C) Q(OS C)=CLK =S (P WM) 1V FB R(P WM) Q(P WM) 70% ON OUT FB S IGNAL DOMINANT 30% OFF MAX. DUTY CYCLE DOMINANT UDG-99037 Figure 3. Waveforms associated with the oscillator latch and the PWM latch. The recommended value for CT is 1nF for frequencies in the 100 kHz or less range and smaller CT for higher frequencies.
PAGE 7
UCC1809-1/-2 UCC2809-1/-2 UCC3809-1/-2 APPLICATION INFORMATION (cont.) Synchronization changed. Both of the synchronization schemes shown in Figure 5 can be successfully implemented with the internal oscillator of the UCC3809. Both schemes allow access to the timing ramp needed for slope compensation and have minimal impact on the programmed maximum duty cycle. In the absence of a sync pulse, the PWM controller will run independently at the frequency set by RT1, RT2, and CT.
PAGE 8
UCC1809-1/-2 UCC2809-1/-2 UCC3809-1/-2 TYPICAL CHARACTERISTICS CURVES 16 160 UCC2809-2 140 UCC2809-1 14 12 120 UVLO (V) Idd standby (uA) 180 100 80 60 10 8 6 40 4 20 2 0 -50 -25 0 25 50 75 100 2809-2 UVLO on 2809-1UVLO on UVLO off 0 125 -50 -25 0 Temperature (deg C) 25 50 Temperature (deg C) Figure 6. IDD (standby) vs. temperature. Figure 7. UVLO vs. temperature.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
PAGE 13
PACKAGE MATERIALS INFORMATION www.ti.com 12-Oct-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device UCC2809DTR-1 Package Package Pins Type Drawing SOIC SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 UCC2809DTR-2 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 UCC2809PTR-1 VSSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.
PAGE 14
PACKAGE MATERIALS INFORMATION www.ti.com 12-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UCC2809DTR-1 SOIC D 8 2500 340.5 338.1 20.6 UCC2809DTR-2 SOIC D 8 2500 340.5 338.1 20.6 UCC2809PTR-1 VSSOP DGK 8 2500 366.0 364.0 50.0 UCC2809PTR-2 VSSOP DGK 8 2500 366.0 364.0 50.0 UCC3809DTR-1 SOIC D 8 2500 340.5 338.1 20.6 UCC3809DTR-2 SOIC D 8 2500 340.5 338.1 20.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.