Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsDCR022405P

SBVS028B − DECEMBER 2000 − REVISED DECEMBER 2007

  

  

 

FEATURES

D UL1950 Recognized

D DIP-18 and SO-10 Packages

D 55 W/in

(3.3 W/cm

) Power Density

D Device-to-Device Synchronization

D Thermal Protection

D 1000 Vrms Isolation

D 400 kHz Switching

D 125 FITS at 55°C

D Short-Circuit Protection

D 12−V, 24−V Inputs

D 5−V Outputs

APPLICATIONS

D Point-of-Use Power Conversion

D Digital Interface Power

D Ground Loop Elimination

D Power-Supply Noise Reduction

DESCRIPTION

The DCR02 family is a series of high-efficiency,

input-isolated, output-regulated DC/DC converters. In

addition to 2−W nominal, galvanically-isolated output

power capability, this range of converters offers very low

output noise and high accuracy.

The DCR02 family is implemented in standard molded

device packaging, providing standard JEDEC outlines

suitable for high-volume assembly.

The DCR is manufactured using the same technology as

standard device packages, thereby achieving very high

reliability.

Input

Controller

LDO

Regulator

ENABLE

RECSYNC

ERROR

OUT

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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.

All trademarks are the property of their respective owners.

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Summary of content (14 pages)

PAGE 1
SBVS028B − DECEMBER 2000 − REVISED DECEMBER 2007 FEATURES D UL1950 Recognized D DIP-18 and SO-10 Packages D 55 W/in3 (3.3 W/cm3) Power Density D Device-to-Device Synchronization D Thermal Protection D 1000 Vrms Isolation D 400 kHz Switching D 125 FITS at 55°C D Short-Circuit Protection D 12−V, 24−V Inputs D 5−V Outputs DESCRIPTION The DCR02 family is a series of high-efficiency, input-isolated, output-regulated DC/DC converters.
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www.ti.com SBVS028B − DECEMBER 2000 − REVISED DECEMBER 2007 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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www.ti.com SBVS028B − DECEMBER 2000 − REVISED DECEMBER 2007 ELECTRICAL CHARACTERISTICS At TA = +25°C, VS = nominal, IOUT = 10mA, COUT = 0.1µF ceramic, and CIN = 2.2µF ceramic, unless otherwise noted(1). DCR02 SERIES PARAMETER TEST CONDITIONS MIN TYP MAX UNITS OUTPUT Setpoint DCR021205 5 V DCR022405 5 V Setpoint accuracy Maximum output current 0.
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www.ti.com SBVS028B − DECEMBER 2000 − REVISED DECEMBER 2007 ELECTRICAL CHARACTERISTICS (continued) At TA = +25°C, VS = nominal, IOUT = 10mA, COUT = 0.1µF ceramic, and CIN = 2.2µF ceramic, unless otherwise noted(1). DCR02 SERIES PARAMETER TEST CONDITIONS MIN TYP MAX UNITS 3 pF Internal oscillator frequency 720 800 880 kHz External synchronization frequency 720 880 kHz External synchronization signal high 2.5 5.0 V 0 0.
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www.ti.com SBVS028B − DECEMBER 2000 − REVISED DECEMBER 2007 FUNCTIONAL DESCRIPTION OVERVIEW The DCR02 series offers isolation from an unregulated power supply operating from a choice of input voltages. This series provides a variety of regulated output voltages at a nominal output power of 2 W. POWER STAGE The input supply is chopped at a frequency of 400 kHz (internal oscillator divided by 2), which is used to drive the center-tapped toroidal transformer.
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www.ti.com SBVS028B − DECEMBER 2000 − REVISED DECEMBER 2007 DECOUPLING ADDITIONAL FUNCTIONS Ripple Reduction DISABLE/ENABLE Due to the very low forward resistance of the DMOS switching transistors, high-current demands are placed upon the input supply for a short time. By placing a good quality low ESR 2.2−µF ceramic capacitor close to the IC supply input pins, the effects on the power supply can be minimized.
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www.ti.com SBVS028B − DECEMBER 2000 − REVISED DECEMBER 2007 GENERATING TWO POSITIVE OUTPUT VOLTAGES APPLICATION NOTES DCR02 SINGLE VOLTAGE OUTPUT Two DCR02s can be used to create two +5−V output voltages, as shown in Figure 4. The two DCR02s are connected in self-synchronization, thus locking the oscillators of both devices to a single frequency. The DCR02 can be used to provide a single voltage output by connecting the circuit as shown in Figure 3.
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www.ti.com SBVS028B − DECEMBER 2000 − REVISED DECEMBER 2007 GENERATION OF DUAL POLARITY VOLTAGES FROM TWO SELF-SYNCHRONIZED DCR02s the supplies must be connected in a star formation, with the tracks made as wide as possible. If the SYNC pin is being used, the tracking between device SYNC pins should be short, to avoid stray capacitance. If the SYNC pin is not being used, it is advisable to place a guard ring (connected to input ground) around this pin to avoid any noise pickup.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 TAPE AND REEL INFORMATION *All dimensions are nominal Device DCR022405P-U/700 Package Package Pins Type Drawing SOP DVS 10 SPQ 700 Reel Reel Diameter Width (mm) W1 (mm) 330.0 32.4 Pack Materials-Page 1 A0 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 11.0 20.0 5.7 16.0 32.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Mar-2008 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) DCR022405P-U/700 SOP DVS 10 700 406.0 348.0 63.
PAGE 12
MECHANICAL DATA MPDS113 – OCTOBER 2001 DVS (R-PDSO-G10/18) PLASTIC SMALL-OUTLINE PACKAGE 0.920 (23,37) 0.880 (22,35) C 18 10 0.280 (7,11) 0.240 (6,10) Index Area 1 C 9 0.022 (0,56) 0.014 (0,36) 0.195 (4,95) D 0.070 (1,78) 0.115 (2,92) 0.210 (5,33) MAX 0.045 (1,14) 0.325 (8.26) 0.300 (7,62) 0.043 (1,10) 0.025 (0,65) Base Plane Seating Plane 0.005 (0,13) MIN 4 PL Full Lead 0.420 (10,70) 0.405 (10,30) 0.014 (0,36) 0.008 (0,20) C L 0°± 5° 0.057 (1,45) 0.045 (1,15) 0.100 (2,54) C 0.
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MECHANICAL DATA MPDI055 – APRIL 2001 NVE (R-PDIP-T10/18) PLASTIC DUAL-IN-LINE 0.920 (23,37) 0.880 (22,35) D 18 10 0.280 (7,11) 0.240 (6,10) D 1 9 Index Area E 0.070 (1,78) 0.045 (1,14) 0.195 (4,95) 0.115 (2,92) Base Plane –C– Seating Plane 0.325 (8,26) 0.300 (7,62) 0.210 (5,33) MAX E 0.005 (0,13) MIN 4 PL Full Lead D 0.100 (2,54) 0.022 (0,56) 0.014 (0,36) 0.010 (0,25) M C 0.150 (3,81) 0.115 (2,92) 0.300 (7,63) 0.014 (0,36) 0.008 (0,20) 0.015 (0,38) MIN 0.060 (1,52) 0.000 (0,00) 0.
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