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FEATURES DESCRIPTION

SYNC

FB1

COMP1

CS1

OUT1

GND

VCC

REF

ENABLE2

FB2

COMP2

CS2

OUT2

PWRGND

N PACKAGE

(TOP VIEW)

SYNC

FB1

COMP1

CS1

OUT1

GND

VCC

REF

ENABLE2

FB2

COMP2

CS2

OUT2

PWRGND

PW PACKAGE

(TOP VIEW)

UCC2810

UCC3810

SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007

DUAL CHANNEL SYNCHRONIZED CURRENT-MODE PWM

• Single Oscillator Synchronizes Two PWMs

The UCC3810 is a high-speed BiCMOS controller

integrating two synchronized pulse width modulators

• 150-µA Startup Supply Current

for use in off-line and dc-to-dc power supplies. The

• 2-mA Operating Supply Current

UCC3810 family provides perfect synchronization

• Operation to 1 MHz

between two PWMs by usin g the same oscillator.

• Internal Soft-Start The oscillator’s sawtooth waveform can be used for

slope compensation if required.

• Full-Cycle Fault Restart

Using a toggle flip-flop to alternate between

• Internal Leading-Edge Blanking of the Current

modulators, the UCC3810 ensures that one PWM

Sense Signal

does not slave, interfere, or otherwise affect the

• 1-A Totem Pole Outputs

other PWM. This toggle flip- flop also ensures that

• 75-ns Typical Response from Current Sense

each PWM is limited to 50% maximum duty cycle,

to Output

insuring adequate off-time to reset magnetic

elements. This device contains many of the same

• 1.5% Tolerance Voltage Reference

elements of the UC3842 current mode controller

family, combined with the enhancements of the

UCC3802. This minimizes power supply parts count.

Enhancements include leading edge blanking of the

current sense signals, full cycle fault restart, CMOS

output drivers, and outputs which remain low even

when the supply voltage is removed.

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 the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (12 pages)

PAGE 1
UCC2810 UCC3810 www.ti.com SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007 DUAL CHANNEL SYNCHRONIZED CURRENT-MODE PWM FEATURES • • • • • • • • • • DESCRIPTION Single Oscillator Synchronizes Two PWMs 150-µA Startup Supply Current 2-mA Operating Supply Current Operation to 1 MHz Internal Soft-Start Full-Cycle Fault Restart Internal Leading-Edge Blanking of the Current Sense Signal 1-A Totem Pole Outputs 75-ns Typical Response from Current Sense to Output 1.
PAGE 2
UCC2810 UCC3810 www.ti.com SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
PAGE 3
UCC2810 UCC3810 www.ti.com SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007 ELECTRICAL CHARACTERISTICS All parameters are the same for both channels, –40°C ≤ TA ≤ 85°C for the UCC2810, 0°C ≤ TA ≤ 70°C for the UCC3810, VCC = 10 V (1) ; RT = 150 kΩ, CT = 120 pF; no load; TA = TJ; (unless otherwise specified) PARAMETER TEST CONDITIONS MIN TYP MAX 4.925 5.000 5.075 4.85 5.00 5.
PAGE 4
UCC2810 UCC3810 www.ti.com SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007 ELECTRICAL CHARACTERISTICS (continued) All parameters are the same for both channels, –40°C ≤ TA ≤ 85°C for the UCC2810, 0°C ≤ TA ≤ 70°C for the UCC3810, VCC = 10 V ; RT = 150 kΩ, CT = 120 pF; no load; TA = TJ; (unless otherwise specified) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT PWM Maximum duty cycle (2) Minimum on-time RT = 150 kΩ, CT = 120 pF 45% 49% 50% RT = 30 kΩ, CT = 120 pF 40% 45% 48% CS = 1.
PAGE 5
UCC2810 UCC3810 www.ti.com SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007 DEVICE INFORMATION TERMINAL FUNCTIONS TERMINAL NAME NO. I/O DESCRIPTION COMP1 5 O COMP2 12 O CS1 6 I CS2 11 I CT 2 O The timing capacitor of the oscillator. Recommended values of CT are between 100 pF and 1 nF. Connect the timing capacitor directly across CT and GND. ENABLE2 14 I A logic input which disables PWM 2 when low. This input has no effect on PWM 1. This input is internally pulled high.
PAGE 6
UCC2810 UCC3810 www.ti.com SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007 APPLICATION INFORMATION TIMING RESISTOR Supply current decreases with increased RT by the relationship: DI CC = 11V RT For more information, see the detailed oscillator block diagram. LEADING EDGE BLANKING AND CURRENT SENSE Figure 1 shows how an external power stage is connected to the UCC3810. The gate of an external power N-channel MOSFET is connected to OUT through a small current-limiting resistor.
PAGE 7
UCC2810 UCC3810 www.ti.com SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007 APPLICATION INFORMATION (continued) VCC 0.2 V + − I 1V R 10I + Q + RON 9 100 − 2.5 V S − One Shot 3 1 2 RT SYNC RT CT Figure 2. Oscillator 5V VCC COMP Figure 3.
PAGE 8
UCC2810 UCC3810 www.ti.com SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007 TYPICAL CHARACTERISTICS ERROR AMPLIFER GAIN AND PHASE vs FREQUENCY OSCILLATOR FREQUENCY vs TIMING RESISTANCE 80 1M 60 90 Gain 20 45 0 0 −20 1k 10 k 100 k 1M Phase − ° Gain − dB Fhase 40 Oscillator Frequency − Hz 135 100 k 10 k 10 k 10 M f − Frequency − Hz 100 k RT − Timing Resistor − W Figure 4. Figure 5. OSCILLATOR FREQUENCY vs TEMPERATURE MAXIMUM DUTY CYCLE vs TIMING RESISTANCE 1.2 10 M 50 48 1.
PAGE 9
UCC2810 UCC3810 www.ti.com SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007 TYPICAL CHARACTERISTICS (continued) MAXIMUM DUTY CYCLE vs FREQUENCY 10 50 8 48 Duty Cycle − % I CC − Input Current − mA INPUT CURRENT vs OSCILLATOR FREQUENCY 6 Switching 4 2 44 42 Outputs Off 10 k 46 CT = 120 pF 100 k 1M 40 10 k 100 k 1M f − Frequency − Hz f − Frequency − Hz Figure 8. Figure 9. DC Input +12 V OUT +5 V OUT 0.
PAGE 10
PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device UCC3810DWTR Package Package Pins Type Drawing SOIC DW 16 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2000 330.0 16.4 Pack Materials-Page 1 10.75 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 10.7 2.7 12.0 16.
PAGE 11
PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UCC3810DWTR SOIC DW 16 2000 367.0 367.0 38.
PAGE 12
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.