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PT5814C Datasheet(PDF) 6 Page - Texas Instruments |
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PT5814C Datasheet(HTML) 6 Page - Texas Instruments |
6 / 11 page Application Notes For technical support and more information, see inside back cover or visit www.ti.com Table 3-1; Input/Output Capacitors Capacitor Recommendations for the PT5800 & PT5810 Step-Down Regulator Series Input Capacitor: The recommended input capacitance is determined by a 700-mA ripple current rating and the following minimum capacitance requirements. • PT5800 = 820 µF minimum capacitance • PT5810 = 1000 µF minimum capacitance 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 the maximum DC voltage + AC ripple. This is necessary to ensure reliabil- ity for input voltage bus applications Output Capacitors The ESR of the capacitors is less than 100m Ω. Electrolytic capacitors have marginal ripple performance at frequen- cies greater than 400 kHz, but excellent low frequency transient response. Above the ripple frequency ceramic capacitors are necessary. Ceramic capacitors improve the transient response and reduce any high frequency noise components apparent during high current excursions. Preferred low-ESR electrolytic capacitor part numbers are identified in Table 3-1. PT5800/5810 Series Tantalum Capacitors (Optional Output 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 rec- ommended 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 less reliable than the AVX TPS series when determining power dissipation capa- bility. 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 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 100 kHz are critical param- eters necessary to insure both optimum regulator performance and long capacitor life. s e i r e S / r o d n e V r o t i c a p a Cs 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 t n e r r u C e l p p i R x a m ) s m r ( I C ° 5 0 1 @ l a c i s y h P ) m m ( e z i S s u B t u p n Is u B t u p t u Or e b m u N t r a P r o d n e V c i n o s a n a P ) l a i d a R ( C F ) T M S ( K F V 0 1 V 0 1 V 0 1 V 5 3 0 0 0 1 0 6 5 0 0 0 1 0 7 4 8 6 0 . 0 Ω 0 9 0 . 0 Ω 0 8 0 0 Ω 0 6 0 . 0 Ω A m 0 5 0 1 A m 5 5 7 A m 0 5 8 A m 0 0 1 1 0 1 × 6 1 0 1 × 5 . 2 1 0 1 × 2 . 0 1 5 . 2 1 × 5 . 3 1 1 2 1 2 1 1 1 1 2 0 1 C 1 C F U E E 1 6 5 A 1 C F U E E P 2 0 1 A 1 K F V E E Q 1 7 4 V 1 K F V E E n o c - i m e h C d e t i n U s e i r e S V X L / Z X L s e i r e S X F V 6 1 V 0 1 V 0 1 0 7 4 0 0 0 1 0 8 6 0 9 0 . 0 Ω 8 6 0 . 0 Ω 5 1 0 . 0 Ω A m 0 6 7 A m 0 5 0 1 A m 5 3 7 4 0 1 × 5 . 2 1 0 1 × 6 1 0 1 × 5 . 0 1 2 1 2 1 1 1 L L 2 1 X 0 1 M 1 7 4 B V 6 1 Z X L L L 6 1 X 0 1 M 2 0 1 B V 0 1 Z X L M 0 8 6 X F 0 1 n o c i h c i N s e i r e S M P / L P ) T M S ( s e i r e S X N V 0 1 V 6 1 V 0 1 0 0 0 1 0 6 5 0 3 3 5 6 0 . 0 Ω 0 8 0 . 0 Ω 4 2 0 . 0 Ω A m 0 4 0 1 A m 0 2 9 A m 0 7 7 3 5 . 2 1 × 5 1 5 . 2 1 × 5 1 0 1 ×8 1 2 3 1 1 1 6 H H M 2 0 1 A 1 M P U 6 H H M 1 6 5 C 1 M P U S G 1 R C M 0 3 3 A 1 X N P : n o c - s O o y n a S P S ) T M S ( P V S V 0 1 V 0 1 0 7 4 0 6 5 5 1 0 . 0 Ω 3 1 0 . 0 Ω A m 0 0 5 4 > A m 0 0 2 5 > 0 1 × 5 . 0 1 1 1 × 7 . 2 1 2 2 1 1 0 7 4 P S 0 1 M M 0 6 5 P V S 0 1 ) T M S ( S P T m u l a t n a T X V AV 0 1 V 0 1 0 7 4 0 7 4 5 4 0 . 0 Ω 0 6 0 . 0 Ω A m 3 2 7 1 A m 6 2 8 1 L 3 . 7 × W 7 . 5 × H 1 . 4 2 2 1 1 4 0 0 R 0 1 0 M 7 7 4 E S P T 5 0 6 0 0 R 0 1 0 M 7 7 4 V S P T m u l a t n a T r e m y l o P t e m e K ( s e i r e S 0 3 5 T / 0 2 5 TT M S) V 0 1 V 0 1 0 3 3 0 3 3 0 4 0 . 0 Ω 5 1 0 . 0 Ω A m 0 0 8 1 A m 0 0 8 3 > 3 . 7 × 3 . 4 ×43 3 1 1 S A 0 1 0 M 7 3 3 X 0 2 5 T S A 0 1 0 M 7 3 3 X 0 3 5 T m u l a t n a T e u g a r p S ( s e i r e S D 4 9 5T M S) V 0 10 8 60 9 0 . 0 Ω A m 0 6 6 12 . 7 ×6× 1 . 42 1 T 2 R 0 1 0 0 X 7 8 6 D 5 9 5 |
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