Linear Technology Analog Devices LT8708-1, Техническое описание

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LT8708-1
5
Rev 0
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PARAMETER CONDITIONS MIN TYP MAX UNITS
MODE Pin Continuous Conduction Mode (CCM) Threshold
l
0.4 V
MODE Pin Hybrid DCM/CCM Mode (HCM) Range
l
0.8 1.2 V
MODE Pin Discontinuous Conduction Mode (DCM) Range
l
1.6 2.0 V
MODE Pin Burst Mode Operation Threshold
l
2.4 V
DIR Pin Forward Operation Threshold
l
1.6 V
DIR Pin Reverse Operation Threshold
l
1.2 V
RVSOFF Output Voltage Low I
RVSOFF
= 200µA
l
0.08 0.5 V
RVSOFF Falling Threshold Voltage
l
1.155 1.209 1.275 V
RVSOFF Threshold Voltage Hysteresis 165 mV
Soft-Start Charging Current V
SS
= 0V
V
SS
= 0.5V
13
21
19
31
25
41
µA
µA
IMON_ON Rising Threshold for FDCM Operation MODE = 1V (HCM), DIR = 3.3V
l
235 255 280 mV
IMON_ON Falling Threshold for CCM Operation MODE = 1V (HCM), DIR = 3.3V
l
185 205 235 mV
IMON_INP Rising Threshold for RDCM Operation MODE = 1V (HCM), DIR = 0V
l
235 255 280 mV
IMON_INP Falling Threshold for CCM Operation MODE = 1V (HCM), DIR = 0V
l
185 205 235 mV
ICP Rising Threshold for Start Switching
l
485 510 536 mV
ICN Rising Threshold for Start Switching
l
485 510 536 mV
ICP Rising Threshold for Enabling Non-CCM Offset Current
l
680 704 730 mV
ICP Falling Threshold for Disabling Non-CCM Offset Current
l
500 530 560 mV
ICN Rising Threshold for Enabling Non-CCM Offset Current
l
680 704 730 mV
ICN Falling Threshold for Disabling Non-CCM Offset Current
l
500 530 560 mV
Voltage Regulation Loops (Refer to Block Diagram to Locate Amplifiers)
Regulation Voltage for FBOUT
Regulate V
C
to 1.2V
l
1.193 1.207 1.222 V
Regulation Voltage for FBIN Regulate V
C
to 1.2V
l
1.184 1.205 1.226 V
Line Regulation for FBOUT and FBIN Error Amp Reference Voltage V
INCHIP
= 12V to 80V, Not Switching 0.002 0.005 %/V
FBOUT Pin Bias Current Current Out of Pin 15 nA
FBOUT Error Amp EA4 g
m
345 µmho
FBOUT Error Amp EA4 Voltage Gain 245 V/V
VOUTLOMON Voltage Activation Threshold Falling
l
1.185 1.207 1.225 V
VOUTLOMON Threshold Voltage Hysteresis 24 mV
VOUTLOMON Pin Bias Current V
VOUTLOMON
= 1.24V, Current Into Pin
V
VOUTLOMON
= 1.17V, Current Into Pin
l
0.8
0.01
1 1.2
µA
µA
FBIN Pin Bias Current Current Out of Pin 10 nA
FBIN Error Amp EA3 g
m
235 µmho
FBIN Error Amp EA3 Voltage Gain 150 V/V
VINHIMON Voltage Activation Threshold Rising
l
1.185 1.207 1.23 V
VINHIMON Threshold Voltage Hysteresis 24 mV
VINHIMON Pin Bias Current V
VINHIMON
= 1.17V, Current Into Pin
V
VINHIMON
= 1.24V, Current Out of Pin
l
0.8
0.01
1 1.2
µA
µA
ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
INCHIP
=12V, SHDN = 3V, DIR = 3.3V unless otherwise noted. (Note 3).