AD8450ASTZ datasheet(31/42 Pages) AD

31 / 42 page

AD8450

Data Sheet

Rev. B | Page 30 of 41

POWER-OFF SEQUENCE

To power off the device, take the following steps:

1. Turn off the input signals.

2. Turn off DVCC.

3. Turn off AVEE.

4. Turn off AVCC.

The positive analog supply (AVCC) and the negative analog

supply (AVEE) may be turned off simultaneously.

PGIA CONNECTIONS

For a description of the PGIA, see the Theory of Operation

section, Figure 49, and Figure 51. The internal gains of the

PGIA (26, 66, 133, and 200) are selected by hardwiring the

appropriate pin combinations (see Table 5).

Table 5. PGIA Gain Connections

PGIA Gain

Connect RGP (Pin 2) to

Connect RGN (Pin 19) to

ISGP0 (Pin 4)

ISGN0 (Pin 17)

ISGP1 (Pin 6)

ISGN1 (Pin 15)

133

ISGP2 (Pin 8)

ISGN2 (Pin 13)

200

ISGP3 (Pin 9)

ISGN3 (Pin 12)

If a different gain value is desired, connect 10 kΩ feedback resistors

between the inverting inputs of the PGIA preamplifiers (RGP

and RGN pins) and the outputs of the PGIA preamplifiers (RFBP

and RFBN pins). Also, connect a gain resistor (RG) between the

RGP and RGN pins. When using external resistors, the gain of

the PGIA is

Gain = 2 × (1 + 20 kΩ/RG)

BATTERY

LEVEL

SHIFTER

ADP1972

PWM

VCTRL

SENSE

RESISTOR

ISVP

ISVN

BVPx

BVNx

AVCC

OUTPUT

DRIVERS

BATTERY

CURRENT

AVEE

BUFFER

–

1×

VINT

BUFFER

VSET

ISET

VINT

ISMEA

BVMEA

OCPS

OCPR

OVPR VREF

OVERCURRENT

COMPARATOR

OVERVOLTAGE

COMPARATOR

FAULT

OVPS

OUTPUT

FILTER

PGDA

–

PGIA

DC-TO-DC

POWER CONVERTER

1×

SET

BATTERY

CURRENT

SET

BATTERY

VOLTAGE

AD8450

CONTROLLER

CONSTANT

VOLTAGE LOOP

FILTER AMPLIFIER

CC AND CV

GATES

CONSTANT

CURRENT LOOP

FILTER AMPLIFIER

MODE

SWITCHES (3)

C = CHARGE

D = DISCHARGE

EXTERNAL PASSIVE

COMPENSATION

NETWORK

NOR

Figure 59. Complete Signal Path of a Battery Test or Formation System Suitable for Li-Ion Batteries

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