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PT6942A Datasheet(PDF) 6 Page - Texas Instruments |
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PT6942A Datasheet(HTML) 6 Page - Texas Instruments |
6 / 11 page For technical support and more information, see inside back cover or visit www.ti.com Notes Table 1: Input/Output Capacitors N/R –Not recommended. The voltage rating does not meet the minimum operating limits. Capacitor Recommendations for the Dual-Output PT6940 Regulator Series Input Capacitor: The recommended input capacitance is determined by 1.0 ampere minimum ripple current rating and 330µF minimum capacitance (300µF for Oscon® or low ESR tantalum). Ripple current and <100m Ω equivalent series resistance (ESR) values are the major considerations, along with tem- perature, when designing with different types of capacitors. Tantalum capacitors have a recommended minimum voltage rating of twice the maximum DC voltage + AC ripple. This is necessary to insure reliability for input voltage bus appli- cations Output Capacitors: Co1/Co2 The ESR of the required capacitors, Co1 & Co2 must not be greater than 150m Ω. Electrolytic capacitors have poor ripple performance at frequencies greater than 400kHz but excellent low frequency transient response. Above the ripple frequency, ceramic capacitors are necessary to improve the transient response and reduce any high frequency noise components apparent during higher current excursions. Preferred low ESR type capacitor part numbers are identified in Table 1. PT6940 Series Tantalum Capacitors Tantalum type capacitors can be used for the output but only the AVX TPS series, Sprague 593D/594/595 series or Kemet T495/T510 series. These capacitors are recommended over many other tantalum types due to their higher rated surge, power dissipation, and ripple current capability. As a caution the TAJ series by AVX is not recommended. This series has considerably higher ESR, reduced power dissipa- tion, and lower ripple current capability. The TAJ series is less reliable than the AVX TPS series when determining power dissipation capability. Tantalum or Oscon® types are recommended for applications where ambient tem- peratures fall below 0°C. Capacitor Table Table 1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple current (rms) ratings. The number of capacitors required at both the input and output buses is identified for each capacitor type. This is not an extensive capacitor list. Capacitors from other vendors are available with comparable specifications. Those listed are for guidance. The RMS ripple current rating and ESR (Equivalent Series Resistance at 100kHz) are critical parameters necessary to insure both optimum regulator performance and long capacitor life. r o t i c a p a C / r o d n e V t n e n o p m o C s e i r e S s c i t s i r e t c a r a h C r o t i c a p a Cy t i t n a u Q g n i k r o W e g a t l o V) F µ ( e u l a V t n e l a v i u q E ) R S E ( e c n a t s i s e R s e i r e S e l p p i R m u m i x a M C ° 5 8 ) s m r I ( t n e r r u C l a c i s y h P ) m m ( e z i S t u p n I s u B t u p t u O s u B r e b m u N r o d n e V c i n o s a n a P C F V 5 2 V 5 3 V 5 3 F µ 0 6 5 F µ 0 9 3 F µ 0 3 3 5 6 0 0 . 0 Ω 5 6 0 . 0 Ω 7 1 1 . 0 Ω A m 5 0 2 1 A m 5 0 2 1 A m 5 5 5 5 1 x 5 . 2 1 5 1 x 5 . 2 1 5 . 1 1 x 8 1 2 R / N 1 1 1 S 1 6 5 E 1 C F U E E S 1 9 3 V 1 C F U E E 1 3 3 C 1 C F U E E d e t i n U n o C - i m e h C / S F / V X L Z X L V 6 1 V 5 3 V 0 1 V 0 2 F µ 0 3 3 F µ 0 7 4 F µ 0 3 3 F µ 0 5 1 0 2 1 . 0 Ω 2 5 0 . 0 Ω 5 2 0 . 0 Ω 0 3 0 . 0 ÷2 Ω A m 5 5 5 A m 0 2 2 1 A m 0 0 5 3 A m 0 0 2 3 2 1 x 8 0 2 x 0 1 5 . 0 1 x 0 1 5 . 0 1 x 0 1 R / N 1 1 2 1 1 1 2 L L 2 1 X 8 M 1 3 3 B V 6 1 Z X L L L 0 2 X 0 1 M 1 7 4 B V 5 3 Z X L M 0 3 3 S F 0 1 M 0 5 1 S F 0 2 n o c i h c i N M P / L P V 5 3 V 5 3 V 0 5 0 6 5F µ 0 3 3F µ 0 7 4F µ 8 4 0 . 0 Ω 5 6 0 . 0 ÷2 Ω 6 4 0 . 0 Ω A m 0 6 3 1 A m 0 2 0 1 A m 0 7 4 1 5 1 x 6 1 5 1 x 5 . 2 1 5 1 x 8 1 1 1 1 1 1 1 6 H H M 1 6 5 V 1 L P U 6 H H M 1 3 3 V 1 L P U 6 H H M 1 1 7 4 H 1 M P U c i n o s a n a P C F ) g t M e c a f r u S ( V 0 1 V 5 3 V 6 1 0 0 0 1F µ 0 3 3F µ 0 3 3F µ 3 4 0 . 0 Ω 5 6 0 . 0 Ω 0 5 1 . 0 Ω A m 5 0 2 1 A m 5 0 2 1 A m 0 7 6 5 . 6 1 x 2 1 6 1 x 5 . 2 1 2 . 0 1 x 0 1 1 1 R / N 1 1 1 Q L 2 0 1 A 1 C F V E E Q L 1 3 3 V 1 C F V E E P 1 3 3 C 1 C F V E E S S - n o c s O V S V 0 1 V 0 1 V 0 2 0 3 3F µ F µ 0 3 3 0 5 1F µ 5 2 0 . 0 Ω 5 2 0 . 0 Ω 4 2 0 . 0 ÷2 Ω A m 0 0 5 3 > A m 0 0 8 3 > A m 0 0 6 3 5 . 0 1 x 0 . 0 1 3 . 0 1 x 3 . 0 1 3 . 0 1 x 3 . 0 1 1 1 2 1 1 2 M 0 3 3 S S 0 1 M 0 0 3 V S 0 1 M 0 5 1 V S 0 2 t n u o M e c a f r u S = V S X V A m u l a t n a T S P T V 0 1 V 0 1 V 0 1 F µ 0 3 3 F µ 0 3 3 F µ 0 2 2 0 0 1 . 0 ÷2 Ω 0 0 1 . 0 ÷2 Ω 5 9 0 . 0 Ω A m 0 0 5 2 > A m 0 0 0 3 > A m 0 0 0 2 > x L 3 . 7 x W 3 . 4 H 1 . 4 2 2 2 1 1 2 0 0 1 0 R 0 1 0 M 7 3 3 V S P T 0 6 0 0 R 0 1 0 M 7 3 3 V S P T 0 0 1 0 R 5 0 1 0 M 7 2 2 V S P T t e m e K / 0 1 5 T 5 9 4 T V 0 1 V 0 1 F µ 0 3 3 F µ 0 2 2 3 3 0 . 0 Ω 7 0 . 0 ÷ Ω 5 3 0 . 0 = 2 Ω A m 0 0 4 1 A m 0 0 0 2 > W 7 . 5 x L 3 . 7 H 0 . 4 x 2 2 1 2 S A 0 1 0 M 7 3 3 X 0 1 5 T S A 0 1 0 M 7 2 2 X 5 9 4 T e u g a r p S D 4 9 5 V 0 1 V 0 1 F µ 0 3 3 F µ 0 2 2 5 4 0 . 0 Ω 5 6 0 . 0 Ω A m 0 5 3 2 A m 0 0 0 2 > x L 3 . 7 x W 0 . 6 H 1 . 4 2 2 1 2 T 2 R 0 1 0 0 X 7 3 3 D 4 T 2 D 0 1 0 0 X 7 2 2 D 4 9 5 Not Recommended For New Designs |
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