|
|
PDF ZXCT1012 Data sheet ( Hoja de datos )
| Número de pieza | ZXCT1012 | |
| Descripción | Reduced height micro-power current monitor | |
| Fabricantes | Zetex Semiconductors | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ZXCT1012 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
|
No Preview Available !
ZXCT1012
Reduced height micro-power current monitor
www.DataSheet4U.com
Description
The ZXCT1012 is a high side current sense
monitor. Using this type of device eliminates
the need to disrupt the ground plane when
sensing a load current.
The ZXCT1012 takes the voltage developed
across a small value resistor and translates it
into a proportional output current. A user
defined output resistor scales the output
current into a ground referenced voltage.
The ZXCT1012 has the accuracy specification of
the ZXCT1010 but in TSOT23-5, and TDFN3x3-5.
Features
• 2.5V to 20V supply range
• 3.5µA quiescent current
• Current output - user set gain
• Thin package - TSOT23-5 and TDFN3x3-5
• Temperature range -40 to 85°C
Pin connections
A minimum operating current of just 3.5µA,
combined with its TSOT23-5 package make it
suitable for portable battery equipment where
size and current consumption are critical.
The wide input voltage range down to as low as
2.5V make it suitable for a wide range of
applications requiring direct operation from a
battery.
Applications
• Battery fuel gauge
• Battery chargers
• Overcurrent monitor
• Power management
Applications circuit
SENSE-
IN SENSE
OUT
SENSE+
TSOT23-5
Pinout - top view
NC 3
4 SENSE-
GND 2
OUT 1
5 SENSE+
TDFN3x3-5
Pinout - bottom view
SENSE+
SENSE-
ZXCT1012
OUT
OUT
OUT
LOAD
Ordering information
Device
Package
Status
ZXCT1012DAATA TDFN-5 (3mm x 3mm) Active
ZXCT1012ET5TA
TSOT23-5
Active
Device
marking
1012
1012
Reel size
(inches)
7
7
Tape width
(mm)
8
8
Quantity
per reel
3000
3000
Issue 1 - December 2006
© Zetex Semiconductors plc 2006
1
www.zetex.com
1 page  
ZXCT1012
Applications information
The ZXCT1012 current monitor works by converting the voltage developed across a small sense
resistor into a current on the out pin. In reality it is a voltage to current converter. This output
current can be converted into a voltage simply by passing it through a resistor (ROUT) to ground.
The current monitor has a transconductance of 10mA/V. But the overall amplifying conversion is
affected by both the RSENSE and ROUT.
The gain equation of the ZXCT1012 is:
VOUT
=
IL
×
RS
ENSE
R-----O----U----T-
100
For best performance RSENSE should be connected as close to the SENSE+ (and SENSE-) pins;
which minimizes any series resistance with RSENSE and potential for interference pickup.
When choosing appropriate values for RSENSE a compromise must be reached between in-line
signal loss (including potential power dissipation effects) and small signal accuracy.
Higher values for RSENSE gives better accuracy at low load currents by reducing the inaccuracies
due to internal offsets. For best operation the ZXCT1012 has been designed to provide best
performance with VSENSE of the order of 40mV to 200mV.
Current monitors are single supply devices which means they tend to saturate at very low sense
voltages. However it does mean the output can never go negative. Also the output can never
change direction (monotonic). This is important if the current monitor is used in a control loop.
As the sense voltage is reduced the output will tend to saturate as the input offset voltage starts
to have greater effect. It is recommended to have a minimum sense voltage of 10mV to minimize
linearity errors. Zetex has specified the output voltage at VSENSE of 10mV, 40mV, 100mV and
200mV; which is the recommended sense voltage range.
The maximum differential input voltage, VSENSE, is 2.5V; however this will cause large output
currents to flow increasing power dissipation in the chip. The sense voltage can be increased
further, without damaging the ZXCT1012, by the inclusion of a resistor, RLIM, between SENSE- pin
and the load. Typical values around 10k⍀. See figure below.
SENSE
RLIM
CC
ZXCT1012
If large reverse currents are expected then the resistor, RLIM, will provide protection from
exceeding absolute maximum ratings.
A suitable value for RLIM can be determined from:
RLIM
»
-V----S---E----N----S---E----(--R---E---F---)
5mA
Where VSENSE(REV) is the maximum expected reverse sense voltage generated.
Issue 1 - December 2006
© Zetex Semiconductors plc 2006
5
www.zetex.com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ZXCT1012.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ZXCT1010 | ENHANCED HIGH-SIDE CURRENT MONITOR | Zetex Semiconductors |
| ZXCT1011 | High-side low drift current monitor | Zetex Semiconductors |
| ZXCT1012 | Reduced height micro-power current monitor | Zetex Semiconductors |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |