BCM400x500y1K8A3z
Electrical Specifications (Cont.)
Specifications apply over all line and load conditions, unless otherwise noted; Boldface specifications apply over the temperature range of -40°C ≤ TINTERNAL
≤ 125°C (T-Grade); All other specifications are at TINTERNAL = 25ºC unless otherwise noted.
Attribute
Symbol
Conditions / Notes
Min
Typ
Max
Unit
General Powetrain PRIMARY to SECONDARY Specification (Forward Direction) Cont.
Effective Primary Capacitance
(Internal)
CPRI_INT
CSEC_INT
CSEC_OUT_EXT
CSEC_OUT_AEXT
Effective Value at 400 VPRI_DC
Effective Value at 50 VSEC_DC
0.37
25.6
µF
µF
µF
Effective Secondary Capacitance
(Internal)
Effective Secondary Output
Capacitance (External)
Effective Secondary Output
Capacitance (External)
Excessive capacitance may drive module into SC
protection
100
CSEC_OUT_AEXT Max = N * 0.5 * CSEC_OUT_EXT MAX, where
N = the number of units in parallel
Protection PRIMARY to SECONDARY (Forward Direction)
Startup into a persistent fault condition. Non-Latching
fault detection given VPRI_DC > VPRI_UVLO+
Auto Restart Time
tAUTO_RESTART
VPRI_OVLO+
VPRI_OVLO-
VPRI_OVLO_HYST
tPRI_OVLO
292.5
420
357.5
450
ms
V
Primary Overvoltage Lockout
Threshold
436
426
10
Primary Overvoltage Recovery
Threshold
405
440
V
Primary Overvoltage Lockout
Hysteresis
V
Primary Overvoltage Lockout
Response Time
100
226
244
15
µs
V
Primary Undervoltage Lockout
Threshold
VPRI_UVLO-
200
225
250
259
Primary Undervoltage Recovery
Threshold
VPRI_UVLO+
VPRI_UVLO_HYST
tPRI_UVLO
V
Primary Undervoltage Lockout
Hysteresis
V
Primary Undervoltage Lockout
Response Time
100
µs
From VPRI_DC = VPRI_UVLO+ to powertrain active, EN
Primary Undervoltage Startup Delay tPRI_UVLO+_DELAY floating, (i.e One time Startup delay form application
of VPRI_DC to VSEC_DC
20
ms
)
From powertrain active. Fast Current limit protection
disabled during Soft-Start
Primary Soft-Start Time
tPRI_SOFT-START
ISEC_OUT_OCP
tSEC_OUT_OCP
ISEC_OUT_SCP
tSEC_OUT_SCP
tOTP+
1
ms
A
Secondary Output Overcurrent Trip
Threshold
37.5
52
47
3.6
59
Secondary Output Overcurrent
Response Time Constant
Secondary Output Short Circuit
Protection Trip Threshold
Secondary Output Short Circuit
Protection Response Time
Overtemperature Shutdown
Threshold
Effective internal RC filter
ms
A
1
110
3
µs
°C
°C
°C
s
Temperature sensor located inside controller IC
125
Overtemperature Recovery
Threshold
tOTP–
105
115
-45
Undertemperature Shutdown
Threshold
Temperature sensor located inside controller IC;
Protection not available for M-Grade units.
Startup into a persistent fault condition. Non-Latching
fault detection given VPRI_DC > VPRI_UVLO+
tUTP
Undertemperature Restart Time
tUTP_RESTART
BCM® Bus Converter
Page 6 of 25
Rev 1.4
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07/2015
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