3
Rev. 0
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Isolated Supply (Flyback LT8301)
|V
GND-LGND
|
Isolation Working Voltage
800
V
V
CC
Input Supply Voltage
l
5.0
12.0
V
5.0
32.0
V
I
VCC
Input Supply Current
Sleep (Note 1)
Standby (Note 1)
10
25
mA
mA
V
UVLO
+
Under Voltage Lockout Rising
(Note 2)
4.2
V
V
UVLO
–
Under Voltage Lockout Falling
(Note 2)
3.1
V
V
OUT
Output Voltage
JP11 = 5.3
JP11 = 12.4
JP11 = 9.0
5.3
12.4
9.0
V
V
V
Nonisolated ADV
CC
Supply, V
CC
= 0V/JP9 = Dis
ADV
CC
Input Supply Voltage
l
4.5
14.5
V
I
ADVCC
Input Supply Current
Sleep (Note 1), ADV
CC
= 12V
Standby (Note 1), ADV
CC
= 12V
10
25
mA
mA
isoSPI Interface J1, J2, ISO+/ISO–
|V
GND-LGND
|
Isolation Working Voltage
800
V
R
TERM
Differential Bus Termination Resistance
100
Ω
Operation Mode Indication LEDs
D2
Sleep LED
LTC2949 Core Sleep
Red
D3
Active LED
LTC2949 Core Standby/Measure
Green
NTC Temperature Sensor NTCG164KF104FT/TDK
R1
Shunt Temperature Resistor
Resistance at 25°C
100k
Ω
R2
Board Temperature Resistor
A, B, C
Steinhart-Hart Parameters
1
T
=
A
+
B•InR
NTC
+
C•(InR
NTC
)
3
A = 9.85013754e-4
B = 1.95569870e-4
C = 7.69918797e-8
Current Sense Resistor (Note 3)
Manufacturer: Isabellenhuette
Tolerance of Nominal Resistance: 5%,
Temperature Range of Given TC: 20°C–60°C
Manufacturer Part Number
BAS-M-R0001-R-5.0
DC2732A-B: 50e–6Ω, R
THI
= 1.5K/W, TC = 100 ppm/K, P140°C = 20W (I
140°C
≈ 630A)
BAS-M-R00005-AEU-5.0
DC2732A-A: 100e–6Ω, R
THI
= 2.0K/W, TC = 50 ppm/K, P140°C = 15W (I
140°C
≈ 380A)
BAS-M-R0002-R-5.0
DC2732A-C: 200e–6Ω, R
THI
= 3.0K/W, TC = 50 ppm/K, P140°C = 10W (I
140°C
≈ 220A)
Note 1:
The sleep current does not reflect the sleep current of LTC2949, which is in the µA range. The DC2732A uses the LT8301 isolated flyback
converter, that requires a minimum load current for stable regulation. To maintain this minimum load and to have some visual feedback on operation
mode of LTC2949, the DC2732A has a red LED that indicates sleep and a green LED that indicates standby/measure state.
Note 2:
The undervoltage lockout is calculated according to LT8301’s data sheet and the nominal resistance values of R16 (R1), R23 (R2).
Note 3:
All given specifications of the current sense resistor are from Isabellenhuette’s data sheet of the BAS series precision and power resistors.
Note 4:
When evaluating the current measurement accuracy of the DC2732A the shunt resistance must be calibrated. Also the remaining temperature
dependency of the resistance (TC) can be calibrated. To allow precise temperature measurement of the current sense resistor, the DC2732A contains an
NTC (R1) placed close to the shunt with good thermal connection (also electrically connected to one pad of the shunt).
PERFORMANCE SUMMARY
The
l
denotes the specifications which apply over the full operating temperature
range (–40°C to 125°C), otherwise specifications are at T
A
= 25°C. The test conditions are V
CC
= 12.0V, JP11 set to 12.4V operation,
unless otherwise noted. JP4–JP6 set to isoSPI, unless otherwise noted.
