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NH033F-L Datasheet(PDF) 11 Page - Lineage Power Corporation |
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NH033F-L Datasheet(HTML) 11 Page - Lineage Power Corporation |
11 / 20 page Data Sheet NH033x-L and NH050x-L Series Power Modules: March 2010 5 Vdc Input; 1.2 Vdc to 3.3 Vdc Output; 10 A and 15 A Lineage Power 11 Test Configurations 8-203(C).h Note: Input reflected-ripple current is measured with a simulated source impedance of 500 nH. Capacitor CS offsets possible battery impedance. Current is measured at the input of the module. Figure 33. Input Reflected-Ripple Test Setup 8-513(C).r Note: Use a 0.1 µF ceramic capacitor and a 1,000 µF aluminum or tantalum capacitor (ESR = 0.05 ¾ @ 100 kHz). Scope mea- surement should be made using a BNC socket. Position the load between 50 mm and 80 mm (2 in. and 3 in.) from the module. Figure 34. Peak-to-Peak Output Noise Measurement Test Setup 8-1173(C).a Note: All measurements are taken at the module terminals. When socketing, place Kelvin connections at module terminals to avoid measurement errors due to socket contact resistance. Figure 35. Output Voltage and Efficiency Measurement Test Setup Design Considerations Input Source Impedance The power module should be connected to a low ac- impedance input source. Highly inductive source impedances can affect the stability of the NH033x-L and NH050x-L Series Power Modules. Adding external capacitance close to the input pins of the module can reduce the ac impedance and ensure system stability. The minimum recommended input capacitance (C1) is a 470 µF electrolytic capacitor with an ESR ð 0.02 Ω @ 100 kHz. Verify the quality and layout of these capaci- tors by ensuring that the ripple across the module input pins is less than 1 Vp-p at IO = IO, max. (See Figures 33, 36, and 37.) The 470 µF electrolytic capacitor (C1) should be added across the input of the NH033x-L or NH050x-L to ensure stability of the unit. The electrolytic capacitor should be selected for ESR and RMS current ratings to ensure safe operation in the case of a fault condition. The input capacitor for the NH033x-L and NH050x-L series should be rated to handle 10 Arms. When using a tantalum input capacitor, take care not to exceed the tantalum capacitor power rating because of the capacitor’s failure mechanism (for example, a short circuit). 8-1215(C).a Figure 36. Setup with External Capacitor to Reduce Input Ripple Voltage To reduce the amount of ripple current fed back to the input supply (input reflected-ripple current), an external input filter can be added. Up to 10 µF of ceramic capacitance (C2) may be externally connected to the input of the NH033x-L or NH050x-L, provided the source inductance (LSOURCE) is less than 1 µH (see Figure 36). TO OSCILLOSCOPE 500 µH CS 220 µF ESR < 0.1 Ω @ 20 ˚C, 100 kHz VI(+) BATTERY CI 470 µF CURRENT PROBE LTEST ESR < 0.2 Ω @ 100 kHz GND VO 1.0 µF RESISTIVE LOAD SCOPE COPPER STRIP 1000 µF GND V I V O II IO SUPPLY CONTACT RESISTANCE CONTACT AND DISTRIBUTION LOSSES LOAD GND SENSE(+) SENSE(-) η VO IO × VI II × ------------------------ x100 = % TO OSCILLOSCOPE 1 µH (MAX) C 2 VI GND SUPPLY CURRENT PROBE LSOURCE 10 µF (MAX) + C 1 470 µF |
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