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PT7673C Datasheet(PDF) 6 Page - Texas Instruments |
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PT7673C Datasheet(HTML) 6 Page - Texas Instruments |
6 / 9 page For technical support and more information, see inside back cover or visit www.ti.com Application Notes Table 2-1: Input/Output Capacitors Capacitor Recommendations for the PT7670 Series of 30-A Switching Regulators Input Capacitor: The recommended input capacitor is determined by a minimum of 1,500 µF of capacitance with a ripple cur- rent rating of 1.1 Arms. Ripple current and <100 m Ω equivalent series resistance (ESR) values are the major considerations, along with temperature, when designing with different types of capacitors. Tantalum capacitors have a recommended minimum voltage rating of twice 2 × (the maximum DC voltage + AC ripple). This is necessary to insure reliability for input voltage bus applications. Output Capacitors: The ESR of the required capacitors is less than 100 m Ω. Electrolytic capacitors have marginal ripple performance at frequencies greater than 400 kHz 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 2-1. PT7670 Series Tantalum Capacitors( Optional Output Capacitors) Tantalum type capacitors can be used for the output but only the AVX TPS, Sprague 593D/594/595, 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 dissipation, and lower ripple current capability. The TAJ series is also less reliable than the AVX TPS series when determining power dissipation capability. Tantalum or Oscon® types are recommended for applications where ambient temperatures fall below 0 °C. Capacitor Table Table 2-1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple cur- rent (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 (at 100 kHz) are critical parameters necessary to insure both optimum regulator performance and long capacitor life. / r o d n e V r o t i c a p a 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 Vt 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 0 1 @ t n e r r u C ) s m r I ( e z i S l a c i s y h P ) m m ( 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 ) T M S ( K F c i n o s a n a P ) l a i d a R ( C F V 5 2 V 5 3 V 6 1 V 6 1 0 0 2 2 0 3 3 0 7 4 0 0 5 1 8 3 0 . 0 Ω 0 8 0 . 0 Ω 0 9 0 . 0 Ω 3 4 0 . 0 Ω A m 0 0 8 1 A m 0 5 8 A m 5 5 7 A m 0 9 6 1 6 1 × 5 . 6 1 0 1 × 2 . 0 1 0 1 × 5 . 2 1 6 1 × 5 1 1 — — 1 1 1 1 1 M 2 2 2 E 1 K F V E E P 1 3 3 V 1 K F V E E 1 7 4 C 1 C F U E E S 2 5 1 C 1 C F U E E n o C - i m e h C d e t i n U Z X L X F V 5 2 V 6 1 V 0 1 0 3 3 0 0 5 1 0 8 6 0 9 0 . 0 Ω 8 3 0 . 0 Ω 5 1 0 . 0 Ω A m 0 6 7 A m 0 6 6 1 A m 5 3 7 4 0 1 × 5 . 2 1 5 . 2 1 × 0 2 0 1 × 5 . 0 1 — 1 2 1 1 1 L L 2 1 X 0 1 M 1 3 3 B V 5 2 Z X L L L 0 2 X 2 1 M 2 5 1 B V 6 1 Z X L M 0 8 6 X F 0 1 s e i r e S L P n o c i h c i N ) T M S ( X N V 5 2 V 0 1 V 0 1 0 9 3 0 0 5 1 0 3 3 0 8 0 . 0 Ω 0 5 0 . 0 Ω 4 2 0 . 0 Ω A m 0 2 7 A m 0 3 3 1 A m 0 7 7 3 5 . 2 1 × 5 1 6 1 × 5 1 0 1 ×8 — 1 5 1 1 1 6 H H M 1 9 3 E 1 L P U 6 H H M 2 5 1 A 1 L P U S G 1 R C M 1 3 3 A 1 X N P ) l a i d a R ( P S n o c - s O ) T M S ( P V S V 0 1 V 0 1 0 7 4 0 3 3 5 1 0 . 0 Ω 7 1 0 . 0 Ω A m 0 1 5 4 > A m 0 5 9 3 > 0 1 × 5 . 0 1 9 × 2 1 × 3 . 8 3 4 1 1 M 0 7 4 P S 0 1 M 0 3 3 P V S 0 1 m u l a t a n a T X V A s e i r e S - S P T V 0 1 V 0 1 0 3 3 0 3 3 0 1 . 0 Ω 6 0 . 0 Ω A m 4 1 4 1 A m 6 2 8 1 L 3 . 7 × W 3 . 4 × H 1 . 4 5 5 1 1 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 m u l a t n a T e u g a r p S D 4 9 5 / D 5 9 5 V 0 1 V 0 1 0 3 3 0 8 6 4 0 . 0 ÷ 5 1 1 0 . 0 = 4 Ω 9 0 . 0 Ω A m 0 0 5 4 > A m 0 1 5 1 > L 3 . 7 × W 7 . 5 × H 0 . 4 5 2 1 1 T 2 R 0 1 0 0 X 7 3 3 D 4 9 5 T 2 R 0 1 0 0 X 7 8 6 D 5 9 5 m u l a t n a T t e m e K ) T M S ( 5 9 4 T / 0 1 5 T V 0 1 V 0 1 0 3 3 0 2 2 5 3 0 . 0 Ω 0 . 0 ÷ 7 5 3 0 . 0 = 2 Ω A m 0 0 0 2 A m 0 0 0 2 > W 3 . 4 × L 3 . 7 × H 0 . 4 5 6 1 2 S A 0 1 0 M 7 3 3 X 0 1 5 S A 0 1 0 M 7 2 2 X 5 9 4 T p a c s o P o y n a S ) T M S ( B P T V 0 10 2 24 0 . 0 Ω A m 0 0 0 3L 2 . 7 × W 3 . 4 × H 1 . 3 62 M 0 2 2 B P T 0 1 |
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