UCC28089

Manufacturer Part NumberUCC28089
ManufacturerTexas Instruments
UCC28089 datasheet
 


Specifications of UCC28089

No. Of Outputs2Driver ConfigurationProgrammable Push-Pull Outputs
Vcc(min)(v)8.0Vcc(max)(v)15
Peak Output Current(a)1Rise Time(ns)28
Fall Time(ns)13Pin/package8SOIC
Operating Temperature Range(c)-40 to 105  
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
23
Page 1/23

Download datasheet (564Kb)Embed
Next
PRIMARY-SIDE PUSH-PULL OSCILLATOR
FEATURES
Push-Pull Oscillator With Programmable
D
Deadtime
High-Current Totem-Pole Dual Output Stage
D
Drives Push-Pull Configuration with 1-A Sink
and 0.5-A Source Capability
Can be Used in Push-Pull, Half-Bridge, or
D
Full-Bridge Topologies
Oscillator Synchronization Output
D
Low Start-Up Current of 130 μA and 1.4-mA
D
Typical Run Current
Over-Current Shutdown
D
Digitally Controlled Over-Current/Retry
D
Feature
Undervoltage Lockout With Hysteresis
D
TYPICAL APPLICATION
+
V
= 48 V
IN
- -
RA
UCC28089
1
SYNC
VDD
8
2
DIS
OUTA
7
RB
3
CT
OUTB
6
CT
4
CS
GND
5
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
WITH DEAD-TIME CONTROL
APPLICATIONS
High Efficiency Cascaded Converters
D
Inverters
D
Electronic Ballasts
D
Uninterruptable Power Supplies (UPS)
D
AC or DC Links
D
DESCRIPTION
The UCC28089 is a versatile BiCMOS controller for
dc-to-dc or off-line fixed-frequency switching power
supplies. The UCC28089 has dual alternating output
stages in dual-alternating push-pull configuration. Both
outputs switch at half the oscillator frequency using a
toggle flip-flop and duty cycle is limited to less than 50%.
www.ti.com
UCC28089
SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006
BIAS
UCC2540
G1
18
2
REF
VDD
16
PGND
15
4
SYNCIN
G2
14
V
= 1.2 V
O
+
- -
UDG-04112
1

UCC28089 Summary of contents

  • Page 1

    ... Uninterruptable Power Supplies (UPS Links D DESCRIPTION The UCC28089 is a versatile BiCMOS controller for dc-to-dc or off-line fixed-frequency switching power supplies. The UCC28089 has dual alternating output stages in dual-alternating push-pull configuration. Both outputs switch at half the oscillator frequency using a toggle flip-flop and duty cycle is limited to less than 50%. ...

  • Page 2

    ... UVLO thresholds are 10.5 V/8.0 V. ORDERING INFORMATION TEMPERATURE RANGE TEMPERATURE RANGE --40°C to 105°C † D (SOIC--8) package is available taped and reeled. Add R suffix to device type (e.g. UCC28089DR) to order quantities of 2,500 devices per reel (for D). CONNECTION DIAGRAM D PACKAGE (SOIC- -8) (TOP VIEW) SYNC 1 8 DIS 2 ...

  • Page 3

    ... J T --65 to 150 stg T +300 sol Symbol MIN 100 CHG(RA+RB --40 J www.ti.com UCC28089 UNITS TYP MAX UNITS -- 100,000 pF 750 kΩ ...

  • Page 4

    ... UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 ELECTRICAL CHARACTERISTICS --40°C to 105°C for UCC28089 (see Note 1), 1 μF capacitor from VDD to GND 110 kΩ 182 Ω 220 pF (unless otherwise noted). PARAMETER Overall Section Startup current VDD < UVLO start threshold (see Note 2) ...

  • Page 5

    ... VDD I Power input connection for this device. SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 UCC28089 VDD/5 GO REF SS LATCH STEP SOFT START RAMP 0.2V COMP FUNCTION www.ti.com UCC28089 UVLO 8 VDD VDD = 10.5/8.0 V VDD OUTPUT LOGIC 7 OUTA 6 OUTB GND UDG-04101 5 ...

  • Page 6

    ... The UCC28089 has a brief cycle leading-edge modulated soft-start cycle so that it will not interfere with secondary-side controlled soft start. Both systems with off-line self bias and auxiliary bias supplies are more fault tolerant with the UCC28089 because it consistently responds to a fault with a delay of at least 56 oscillator cycles before retry. ...

  • Page 7

    ... T A  CHARGE is in Farads Hz OSC CHARGE timing capacitor range from 100 pF to 1000 nF and R T www.ti.com UCC28089 and ORDER EQUATIONS < 300 kΩ OR 100 pF < C < 300    ...

  • Page 8

    ... Using the UCC28089 as the Primary-Side start-up Controller in a Cascaded Push-Pull Buck Two-Stage Converter The cascaded push-pull topology is ideal for converting from moderate bus voltages, such as 48-V telecom buses, to sub 2-V output voltages. The general topology is shown in Figure 2 using the UCC28089 as the primary-side start-up controller and the UCC2540 as the secondary-side regulator [3]. + ...

  • Page 9

    ... Figure 3. Isolation and clamping the SYNC signal for Cascaded Buck Converters Notice that the peak-pulse voltage is proportional to the UCC28089 bias voltage. The circuit in Figure 3 is well suited to the full VDD bias voltage range of the UCC28089 bias voltage because it has a clamp circuit. The clamp circuit in Figure 3 (R ...

  • Page 10

    ... In systems where multiple UCC28089 parts need to be synchronized to a common clock, a 3.3-V logic-level signal can be directly applied to the CT pin (the SYNC pin on UCC28089 only provides output sync signals). As shown in Figure 4, the externally supplied sync pulse width determines the frequency and the dead time between OUT A and OUT B ...

  • Page 11

    ... Using the circuit in Figure 5, the UCC28089 can provide the appropriate waveform along with primary side over-current protection. Components RA, RB, and CT are selected to program the desired modified square waveform with the appropriate dead time ...

  • Page 12

    ... Figure 6. External Synchronization Example with 50% Duty Cycle Square Wave RELATED PRODUCTS DEVICE UCC2540 High-Efficiency Secondary-Side Synchronous-Buck PWM Controller 12 APPLICATION INFORMATION NC Ext. Sync External Sync example with 50% duty cycle DESCRIPTION www.ti.com VDD U1 UCC28089 1 SYNC 8 VDD 1 μF 2 DIS 7 OUTA OUTB 4 CS ...

  • Page 13

    ... OSCILLATOR FREQUENCY SHIFT 2.0% VDD = 221 kΩ 3.32 Ω 220 pF T 0.5% 0.0% - -0.5% 75 100 125 8 9 www.ti.com UCC28089 vs TEMPERATURE 100 125 Temperature - - °C Figure 8 vs SUPPLY VOLTAGE R = 110 kΩ 182 Ω 220 221 kΩ 3.32 Ω ...

  • Page 14

    ... UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 OSCILATOR FREQUENCY 100 100 1 μ 10 μ 100 μ Figure 11 SYNC PULSE WIDTH vs TEMPERATURE 115 R = 110 kΩ 182 Ω 110 220 pF T 105 100 ...

  • Page 15

    ... CURRENT SENSE THRESHOLD 810 790 770 750 730 710 690 670 650 75 100 125 - -50 - -25 www.ti.com UCC28089 vs TEMPERATURE 100 125 Temperature - - °C Figure 16 vs TEMPERATURE 100 125 Temperature - - °C Figure 18 15 ...

  • Page 16

    ... UCC28089 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 SUPPLY CURRENT vs OSCILLATOR FREQUENCY (NO LOAD) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0 200 K 400 Oscillator Frequency - - kHz OSC Figure 19 TYPICAL SOFT START WAVEFORMS OUTA OUTB SYNC Time - - 1 ms/div. Figure 21 16 TYPICAL CHARACTERISTICS OSCILLATOR FREQUENCY (1 nF LOADS ...

  • Page 17

    ... Low Cost Inverter Suitable for Medium-Power Fuel Cell Sources, by P.T. Krein and R Balog, IEEE Power Electronics Specialists Conference Proceedings, 2002, vol. 1, pp. 321--326. 3. Datasheet, UCC2540 High-Efficiency Secondary-Side Synchronous-Buck PWM Controller, Texas Instruments Literature No. SLUS539 SLUS623A -- SEPTEMBER 2004 -- REVISED AUGUST 2006 www.ti.com UCC28089 17 ...

  • Page 18

    ... UCC28089D ACTIVE UCC28089DG4 ACTIVE UCC28089DR ACTIVE UCC28089DRG4 ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design ...

  • Page 19

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing UCC28089DR SOIC D PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 (mm) Diameter Width (mm) W1 (mm) 8 2500 330.0 12.4 6.4 Pack Materials-Page 1 29-Jul-2008 B0 (mm) K0 (mm Pin1 (mm) (mm) Quadrant 5.2 2.1 8.0 12.0 Q1 ...

  • Page 20

    ... Device Package Type UCC28089DR SOIC PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 2500 Pack Materials-Page 2 29-Jul-2008 Width (mm) Height (mm) 346.0 346.0 29.0 ...

  • Page 21

    ...

  • Page 22

    ...

  • Page 23

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...