NH033 datasheet(11/20 Pages) LINEAGEPOWER

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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

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

@ 20 ˚C, 100 kHz

VI(+)

BATTERY

CI 470 µF

CURRENT

PROBE

LTEST

ESR < 0.2

@ 100 kHz

GND

1.0 µF

RESISTIVE

LOAD

SCOPE

COPPER STRIP

1000 µF

GND

V I

V O

SUPPLY

CONTACT RESISTANCE

CONTACT AND

DISTRIBUTION LOSSES

LOAD

GND

SENSE(+)

SENSE(-)

------------------------

x100

TO OSCILLOSCOPE

1 µH (MAX)

C 2

GND

SUPPLY

CURRENT

PROBE

LSOURCE

10 µF (MAX)

C 1

470 µF

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