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VTM 48 E x 120 y 025A00
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 11.5 V must be applied indefinitely for V IN < 26 V
to ensure normal operation.
? VC slew rate must be within range for a succesful start.
? PRM VC can be used as valid wake-up signal source.
? Internal Resistance used in “Adaptive Loop” compensation
? VC voltage may be continuously applied
SIGNAL TYPE
STATE
ATTRIBUTE
External VC voltage
SYMBOL
V VC _ EXT
CONDITIONS / NOTES
Required for start up, and operation
below 26 V. See Section 7.
MIN
11.5
TYP
MAX UNIT
16.5
V
VC = 11.5 V, V IN = 0 V
115
150
ANALOG
INPUT
Steady
VC current draw
VC internal diode rating
VC internal resistor
VC internal resistor
temperature coefficient
I VC
D VC _ INT
R VC - INT
T VC _ COEFF
VC = 11.5 V, V IN > 26 V
VC = 16.5 V, V IN > 26 V
Fault mode. VC > 11.5 V
0
0
60
100
0.511
mA
V
k Ω
900 ppm/°C
VC start up pulse
V VC _ SP
Tpeak <18 ms 20
V
Start Up
VC slew rate
VC inrush current
dVC/dt
I INR _ VC
Required for proper start up;
VC = 16.5 V, dVC/dt = 0.25 V/μs
0.02 0.25
1
V/μs
A
VC to V OUT turn-on delay T ON
V IN pre-applied, PC floating,
VC enable, C PC = 0 μF
500
μs
Transitional
VC to PC delay Tvc_pc
VC = 11.5 V to PC high, V IN = 0 V,
dVC/dt = 0.25 V/μs
75 125
μs
Internal VC capacitance C VC _ INT
VC = 0 V 3.2
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 or VC > 11.5 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 start up.
? PC pin cannot sink current and will not disable other modules
during fault mode.
SIGNAL TYPE
STATE
ATTRIBUTE
PC voltage
SYMBOL
V PC
CONDITIONS / NOTES
MIN
4.7
TYP
5
MAX UNIT
5.3
V
ANALOG
OUTPUT
DIGITAL
INPUT / OUPUT
Steady
Start Up
Enable
Disable
Transitional
PC source current
PC resistance (internal)
PC source current
PC capacitance (internal)
PC resistance (external)
PC voltage
PC voltage (disable)
PC pull down current
PC disable time
PC fault response time
I PC _ OP
R PC _ INT
I PC _ EN
C PC _ INT
R PC _ S
V PC _ EN
V PC _ DIS
I PC _ PD
T PC _ DIS _ T
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
5
100
2
400
300
1000
3
2
mA
k Ω
μA
pF
k Ω
V
V
mA
μs
μs
Rev. 3.1
V?I CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
2/2011
Page 3 of 18
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