PRM48AY480X400A00 Datasheet, PDF (14/44 Pages) Vicor Corporation – High Efficiency Converter

PRM48Ay480x400A00
Signal Specifications (cont.)
Specifications apply over all line and load conditions, T_INT = 25ºC and output voltage from 20.0 V to 55.0 V, unless otherwise noted.
Boldface specifications apply over the temperature range of -40ºC < T_INT < 125ºC (T-grade).
VT: VTM Temperature (Adaptive Loop Operation Only)
• VTM temperature compensation for Adaptive Loop regulation
• Adjusts the slope of the Adaptive Loop load line to account for changes in VTM output resistance over temperature
• Connect to TM pin of compatible downstream VTM to enable temperature compensation
• Leave disconnected to disable temperature compensation
Signal Type
State
Attribute
Symbol
Conditions / Notes
Min
Internal Resistance
to SGND
R_{VT_INT}
VT Enable Threshold
V_{VT_EN}
Pull below this value to disable VT
VT Disable Threshold V_{VT_DIS}
1.9
temperature compensation
Analog Input
VT Disable Default
Normal Temperature
Operation VT Analog Range
VT Temperature
T_{VT_DIS}
V_{VT_OP}
TC_VT
Default AL temperature setting
when VT disabled
VT within active range, referenced
to 2.98 V
2.18
Coefficient
TC_VT
VTM TM voltage applied, .01V/°K,
referenced to 25°C
VT Resolution
VT Latency
TC_{VT_RES} VTM TM voltage applied, .01V/°K
t_{VT_LAT}
60
Bandwidth
BW_VT
-3dB point
Typ
80.0
25
30
0.3
0.4
120
1.5
Max
2.1
Unit
kΩ
V
V
°C
3.98
V
%/V
%/C
°C
240
µs
kHz
REF: Reference (Adaptive Loop Operation Only)
• Functions as REF pin in Adaptive Loop Operation
• REF represents the internal voltage reference for the voltage control circuit
• V_OUT approximately equal to 20 times REF voltage
Signal Type
State
Attribute
Symbol
Conditions / Notes
Min
Typ
Max Unit
Analog Output
REF Voltage
Normal
Operation
REF to V_OUT
Scale Factor
REF Resistance
(External)
REF Capacitance
(External)
V_REF
G_{REF_VOUT}
V_OUT = 48.0 V, trim inactive
V_OUT / V_REF
R_{REF_EXT}
C_{REF_EXT}
2.4
V
20
V/V
10
MΩ
200
pF
REF Voltage Ripple
V_{REF_PP} Includes burst mode, 20 MHz BW
100
mV
ENABLE to REF Delay t_{ENABLE_REF} ENABLE low to REF low
120
µs
Transition
VAUX to REF Delay
t_{VAUX_REF}
VAUX = 8.1 V to REF soft start
ramp initiated
1
ms
PRM^TM Regulator
Page 14 of 44
Rev 1.4
11/2015
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