EVAL-AD5560EBUZ Analog Devices Inc, EVAL-AD5560EBUZ Datasheet - Page 29

• Manufacturer Part Number: EVAL-AD5560EBUZ
• Description: Evaluation Board
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD5560EBUZ

• Main Purpose: Power Management, Power Supply Supervisor/Tracker/Sequencer
• Utilized Ic / Part: AD5560
• Primary Attributes: *
• Secondary Attributes: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Embedded: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

resistors to further optimize stability and settling time perform-
ance. The AD5560 has three compensation modes: safe mode,
autocompensation mode, and manual compensation mode, all
of which are described in more
Stability section.
The range of suggested compensation capacitors allows
optimum performance for any capacitive load from 0 pF
to 160 μF using one of the modes previously listed.
Although there are four compensation input pins and five feed-
forward capacitor inputs pins, all capacitor inputs may be used
only if the user intends to drive large variations of DUT load
capacitances. If the DUT load capacitance is known and does
not change for all combinations of voltage ranges and test
conditions, then it is possible only one set of C
capacitors may be required.
Table 8. Suggested Compensation Capacitor Selection
Capacitor
C
C
C
C
C
C
C
C
C
The voltage range for the C
voltage range expected on FORCE; therefore, choice of capa-
citors should take this into account. C
10% tolerance; this extra variation directly affects settling
times, especially when measuring current in the low current
ranges. Selection of C
CURRENT RANGE SELECTION
Integrated thin film resistors minimize external components
and allow easy selection of current ranges from ±5 μA to
±25 mA. Using external current sense resistors, two higher
current ranges are possible: EXTFORCE1 can drive currents
up to ±1.2 A, while EXTFORCE2 is designed to drive currents
up to ±500 mA. The voltage drop across the selected sense resistor
is ±500 mV when full-scale current is flowing through it.
The measure current amplifier has two gain settings, 10 and
20. The two gain settings allow users to achieve the quoted/
specified current ranges with large or small voltage swings.
The gain of 20 setting is intended for use with a 5 V reference,
and the gain of 10 setting is for use with a 2.5 V reference. Both
combinations ensure the specified current ranges. Other
VREF/gain setting combinations should only be used to
achieve smaller current ranges. Attempting to achieve greater
current ranges than the specified ranges is outside the intended
operation of the AD5560. The maximum guaranteed voltage
across R
C0
C1
C2
C3
F0
F1
F2
F3
F4
SENSE
is ±0.64 V (gain of 20) or ±0.7 V (gain of 10).
Cx
should be at ≤5% tolerance.
Cx
and C
Value
100 pF
100 pF
330 pF
3.3 nF
4.7 nF
22 nF
100 nF
470 nF
2.2 μF
Fx
pins is the same as the
Fx
capacitors can have
Cx
and C
Fx
Rev. C | Page 29 of 60
HIGH CURRENT RANGES
For currents in excess of 1200 mA, a gang mode is available
whereby multiple devices are ganged together for higher currents.
There are two methods of ganging channels together; these are
discussed in the following two sections.
Master and Slaves in Force Voltage (FV) Mode
All devices are placed in force voltage (FV) mode. One device
acts as the master device and the other devices act as slaves. By
connecting in this manner, any device can be configured as the
master. Here, the MASTER_OUT pin of the master device is
connected to the output of the force amplifier, and it feeds the
inputs of each slave force amplifier (via the SLAVE_IN pin ).
All devices are connected externally to the DUT. For current
to be shared equally, there must be good matching between
each of the paths to the DUT. Settings for DPS Register 2 are
master = 0x0000, slave = 0x0400. Clamps should be disabled in
the slave devices.
MASTER DPS
SLAVE DPS 1
SLAVE DPS 2
Figure 52. Simplified Block Diagram of High Current Ganging Mode
DAC
DAC
DAC
FIN
FIN
FIN
SW16
SW16
SW16
FEEDBACK
FEEDBACK
FEEDBACK
LOCAL
LOCAL
LOCAL
V
V
V
I
I
I
SENSE
SENSE
SENSE
AMP
SENSE
AMP
AMP
SENSE
AMP
AMP
SENSE
AMP
SW5-a
SW5-a
SW5-a
SW5-b
SW5-b
SW5-b
SW5-a
OR
SW5-a
OR
SW5-a
OR
×20
×W
×20
×W
×20
×W
×1
×1
×1
MASTER OUT
EXTMEASIH1
MASTER OUT
EXTMEASIH1
MASTER OUT
EXTMEASIH1
SW6
EXTFORCE1
EXTFORCE2
SW6
SW6
EXTFORCE1
EXTFORCE2
EXTMEASIL
EXTFORCE1
EXTFORCE2
EXTMEASIL
EXTMEASIL
SLAVE IN
SLAVE IN
SLAVE IN
SENSE
SENSE
SENSE
DUTGND
AD5560
R
SENSE
DUT