• On/Off control referenced to input side (positive or
negative logic options)
• Inherent current share (by droop method) for high cur-
rent and parallel applications
Product # BQ55090HTA57
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BH559P Rev. 7
10/20/04
Page 1
Technical Specification
MECHANICAL
DIAGRAM
0.19
(4.8)
Input:
Output:
Current:
Package:
2.30
(58.4)
36-55 V
9.0 V
57 A
Half-brick
1.90
(48.3)
0.200
(5.08)
0.50
0.400
(10.16)
(12.7)
2.40
Top View
1.400
(35.56)
(61.0)
1.600
(40.64)
1.400
(35.56)
0.404+/-.034
Bottom side
Clearance
See Note 9
(10.26+/-0.86)
Side View
0.068+/-0.036
(1.73+/-0.91)
Lowest
Component
Load Board
0.145
(3.68)
See Note 3
NOTES
1) Pins 1-3 are 0.040” (1.02mm) diameter. with 0.080”
(2.03mm) diameter standoff shoulders.
2) Pins 4-7 are 0.080” (2.03 mm) diameter with 0.125”
(3.18mm) diameter standoff shoulders.
3) Other pin extension lengths available. Recommended pin
length is 0.03” (0.76mm) greater than the PCB thickness.
4) All Pins: Material - Copper Alloy
Finish - Tin/Lead over Nickel plate
5) Undimensioned components are shown for visual reference
only.
6) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
7) Weight: 2.6 oz. (75g) typical
8) Workmanship: Meets or exceeds IPC-A-610C Class II
9)
UL/TUV standards require a clearance greater than 0.04”
(1.02mm) between input and output for Basic insulation. This issue
should be considered if any copper traces are on the top side of
the user’s board. Note that the ferrite cores are considered part of
the input/primary circuit.
Product # BQ55090HTA57
Phone 1-888-567-9596
www.synqor.com
PIN DESIGNATIONS
Pin No.
1
2
3
4
5
6
7
Name
Vin(+)
ON/OFF
Vin(-)
Vout(+)
Vout(-)
Vout(+)
Vout(-)
Function
Positive input voltage (36V - 55V)
TTL input to turn converter
on and off, referenced to
Vin(-), with internal pull up.
Negative input voltage
Positive output voltage
Negative output voltage
Positive output voltage
Negative output voltage
Doc.# 005-2BH559P Rev. 7
10/20/04
Page 2
Technical Specification
BQ55090HTA57 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
Input:
Output:
Current:
Package:
36-55 V
9.0 V
57 A
Half-brick
T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc unless otherwise noted; full operating temperature range is -40°C to +100°C ambient tem-
perature with appropriate power derating. Specifications subject to change without notice.
Min.
Typ.
Max.
60
55
2000
100
125
18
48
55
35
33.5
2
58
56
7.0
7
140
1\6.6
47
7.2
9.0
TBD
TBD
TBD
6.7
150
20
91
64.5
5
+20
10
40
200
100
500
5
0
96.0
96.5
125
125
125
2000
30
8
11.0
Units
V
V
V
°C
°C
V
V
V
V
V
V
V
A
A
mA
A
2
s
mA
mA
A
µH\µF
µF
V
%\V
%\mV
%\mV
V
mV
mV
A
A
A
V
%
mA
µF
dB
mV
µs
µs
ms
%
%
%
°C
°C
°C
V
M
Ω
pF
Notes & Conditions
continuous
continuous
Basic insulation, Pollution Degree 2
Input Voltage
Non-Operating
Operating
Isolation Voltage (input to output)
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
-40
-55
-2
36
34
32.5
1
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Input Over-Voltage Shutdown
Turn-Off Voltage Threshold
Turn-On Voltage Threshold
Maximum Input Current
No-Load Input Current
Disabled Input Current
Inrush Current Transient Rating
Input Reflected Ripple Current
Input Terminal Ripple Current
Recommended Input Fuse
Input Filter Component Values (L\C)
Recommended External Input Capacitance
TBD
0.17
15
0.01
10
25
100% Load, 36 Vin
RMS through 10µH inductor; Figures 16 & 18
RMS; Figures 16 & 17
fast blow external fuse recommended
internal values, see Figure E
Typical ESR 0.1-0.2
Ω;
See Figure 16
48Vin, no load
Figure 4
Figure 4
Figure 4
over sample, line, load, temperature & life
20MHz bandwidth; Figures 16 & 19
Full Load, see Figures 16 & 19
Full Load, see Figures 16 & 19
at 6.7Vout, 36Vin; subject to derating
36Vin,Output Voltage 10% Low
55Vin,Output Voltage 10% Low
% of rated output current
Negative current drawn from output
9.0Vout at 57A Resistive Load
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Current Share Accuracy (2 units paralleled)
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
Input Voltage Ripple Rejection
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs)
Settling Time
Turn-On Transient
Turn-On Time (without output capacitance)
Turn-On Time (with output capacitance)
Output Voltage Overshoot
100% Load
50% Load
Semiconductor Junction Temperature (see Note 1)
Board Temperature
Transformer Temperature
Isolation Voltage (dielectric strength)
Isolation Resistance
Isolation Capacitance
11.0
0
57
3,000
DYNAMIC CHARACTERISTICS
50-75-50% Iout max; Vin nom; Figure 15
to within 1% Vout nom
Figures 13-14
Full load, Vout=90% nom., 0 output cap.
Full load, Vout=90% nom., 3,000 µF cap.
3,000 µF load cap., Iout = 0A, Vin nom.
Figures 1-3
Figures 1-3
Package rated to 175°C
Board rated to 165°C
See Figures 5 - 12 for derating curves
EFFICIENCY
TEMPERATURE LIMITS FOR POWER DERATING CURVES
ISOLATION CHARACTERISTICS
470
1. For normal operating conditions of 55°C ambient temperature and 200 LFM airflow. Device is designed to operate for a minimum of 72 hours, once per
year under the following conditions: 70°C, 200 LFM airflow, 36Vin, 240W output power. Junction temperature during those conditions will exceed the listed
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