Linear Technology DC1962C, Демонстрационное руководство

Страница: 3 / 31

2
dc1962cf
DEMO MANUAL DC1962C
performance summary
Specifications are at T
A
= 25°C
POWER SUPPLY CHANNEL CH(0:1) CH(2:5) CH(6:13)
Manager/Controller LTC3880 LTC2974 LTC2977
Nominal Untrimmed Output Voltages 0.85V, 1.1V
(Defined by Config)
1.5V, 1.8V, 2.0V, 2.2V 0.9V, 1.0V, 1.1V, 1.2V,
2.5V, 2.7V, 3.0V, 3.3V
Rated Output Current 0.3A
Default Margin Range ± 5%
Output Trim Range (V
FS_VDAC
= 1.38V) Each Channel Is Adjustable
from 0.5V to 4.5V (Note 1)
15%/–11% 15%/–11%
Temperature 1 Internal, 2 Ext. 1 Internal, 4 Ext. 1 Internal
Common Characteristics. Specifications Valid Over Full Operating Temperature Range
PARAMETER CONDITIONS
VALUE
MIN TYP MAX UNITS
V
PWR
Supply Input Voltage Range 6 14 V
ADC Total Unadjusted Error V
IN_ADC
≥ 1V, Applies to LTC2974/LTC2977 ±0.25 %
V
IN_ADC
≥ 1V, Applies to LTC3880 ±0.5 %
ADC Voltage Sensing Input Range Differential Voltage: V
IN_ADC
= (V
SENSEP n
– V
SENSEM n
) 0 6 V
Note 1: Note that V
OUT_MAX
limit is set to 2.5V by default. V
OUT_MAX
clamps the voltage setpoint to 2.5V. It is recommended that you change the V
OUT_MAX
register and associated V
OUT
FAULT limit registers when changing V
OUT
to prevent the channel from faulting off.
The following list contain terms used throughout the document.
Channel – The collection of functions that monitor, supervise, and trim a given power supply rail.
EEPROM – Non-volatile memory (NVM) storage used to retain data after power is removed.
Margin – Term used typically in board level testing that increases/decreases the output voltage to look for sensitivity/
marginality problems
NVM – Non-volatile memory, see EEPROM.
Monitor – The act of measuring voltage, current, and temperature readings.
PMBus – An industry standard power-management protocol with a fully defined command language that facilitates
communication with power converters and other devices in a power system.
Rail – The final output voltage that the power supply controller manages.
Supervise – The act of quickly responding (warning or faulting) to a voltage, current, temperature condition that is
compared to pre-programmed values.
Trim – The act of adjusting the final output voltage. A servo loop is typically used to trim the voltage.
Glossary of terms