VTM 48 EH 020 x 040A00
3.0 SIGNAL CHARACTERISTICS
Specifications apply over all line and load conditions unless otherwise noted; Boldface specifications apply over the temperature
range of -40 °C < T J < 125 °C (T-Grade) ; All other specifications are at T J = 25 °C unless otherwise noted.
VTM CONTROL : VC
? Used to wake up powertrain circuit.
? A minimum of 12 V must be applied indefinitely for V IN < 26 V
to ensure normal operation.
? VC slew rate must be within range for a successful start.
? PRM VC can be used as valid wake-up signal source.
? VC voltage may be continuously applied;
there will be minimal VC current drawn when V IN > 26 V and VC < 13.
? Internal resistance used in adaptive loop compensation
SIGNAL TYPE
STATE
ATTRIBUTE
External VC voltage
SYMBOL
V VC _ EXT
CONDITIONS / NOTES
Required for startup, and operation
below 26 V. See Section 7.
MIN
12
TYP
MAX UNIT
16.5
V
VC current draw threshold
V VC _ TH
Low VC current draw for V IN >26 V
13
V
Steady
VC current draw
I VC
VC = 13 V, V IN = 0 V
VC = 13 V, V IN > 26 V
90
6
150
mA
VC = 16.5 V, V IN > 26 V
90
VC internal resistor
R VC - INT
9.31
k Ω
ANALOG
INPUT
Start Up
VC slew rate
VC inrush current
dVC/dt
I INR _ VC
Required for proper startup;
VC = 16.5 V, dVC/dt = 0.25 V/μs
0.02
0.25
750
V/μs
mA
VC output turn-on delay T ON
V IN pre-applied, PC floating, VC enable
C PC = 0 μF, C OUT = 1500 μF
500
μs
Transitional
VC to PC delay T VC _ PC
Internal VC capacitance C VC _ INT
VC = 12 V to PC high, V IN = 0 V,
dVC/dt = 0.25 V/μs
VC = 0 V
10
2.2
25
μs
μF
PRIMARY CONTROL : PC
? The PC pin enables and disables the VTM.
When held below 2 V, the VTM will be disabled.
? PC pin outputs 5 V during normal operation. PC pin is equal to 2.5 V
during fault mode given V IN > 26 V and VC > 12 V.
? After successful start-up and under no fault condition, PC can be used as
a 5 V regulated voltage source with a 2 mA maximum current.
? Module will shutdown when pulled low with an impedance
less than 400 ?.
? In an array of VTMs, connect PC pin to synchronize startup.
? PC pin cannot sink current and will not disable other module
during fault mode.
SIGNAL TYPE
STATE
ATTRIBUTE
SYMBOL
CONDITIONS / NOTES
MIN
TYP
MAX UNIT
PC voltage V PC
4.7
5.0
5.3
V
ANALOG
OUTPUT
DIGITAL
INPUT / OUPUT
Steady
Start Up
Enable
Disable
Transitional
PC source current I PC _ OP
PC resistance (internal) R PC _ INT
PC source current I PC _ EN
PC capacitance (internal) C PC _ INT
PC resistance (external) R PC _ EXT
PC voltage (enable) V PC _ EN
PC voltage (disable) V PC _ DIS
PC pull down current I PC _ PD
PC disable time T PC _ DIS _ T
PC fault response time T FR _ PC
Internal pull down resistor
Section 7
From fault to PC = 2 V
50
50
60
2
5.1
150
100
2.5
4
100
2
400
300
50
3
2
mA
k Ω
μA
pF
k Ω
V
V
mA
μs
μs
TEMPERATURE MONITOR : TM
? The TM pin monitors the internal temperature of the VTM controller IC
within an accuracy of ±5 °C.
? Can be used as a "Power Good" flag to verify that the VTM is operating.
? The TM pin has a room temperature setpoint of 3 V (@27 °C)
and approximate gain of 10 mV/ °C.
SIGNAL TYPE
STATE
ATTRIBUTE
TM voltage
SYMBOL
V TM _ AMB
CONDITIONS / NOTES
T J controller = 27 °C
MIN
2.95
TYP
3.00
MAX UNIT
3.05
V
ANALOG
OUTPUT
Steady
TM source current
TM gain
TM voltage ripple
I TM
A TM
V TM _ PP
C TM = 0 F, V IN = 45 V,
I OUT = 40 A
10
120
100
200
μA
mV/°C
mV
DIGITAL OUTPUT
(FAULT FLAG)
Disable
Transitional
TM voltage
TM resistance (internal)
TM capacitance (external)
V TM _ DIS
R TM _ INT
C TM _ EXT
Internal pull down resistor
25
0
40
50
50
V
k Ω
pF
TM fault response time
T FR _ TM
From fault to TM = 1.5 V
10
μs
Rev. 2.1
VI CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
6/2012
Page 3 of 16
v i c o r p o w e r. c o m
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