Q
-ClassConverters
QHS50-018 Model
Model
Parameter
Output Voltage Setpoint
Line/Load Regulation
Output total regulation
Output adjust
Remote-sense Comp.
Output Ripple & Noise (note 2)
Output Current
Efficiency (48V, Full load, 25C)
External Capacitance
Transient Response (typ) (note3)
25% step, 1A/µs
Over-voltage trip point – static
- dynamic
Over-current trip point
Typ
Max
Min
Max
Typ
Max
∆Vo
Ts
Max
1.8V
1.78 – 1.82
0.1%, 0.2%
1.75 – 1.85
90-110
+10
100
0.5
50
88%
10,000
150
300
2.1 - 2.3
max 2.6
57
Units
Vdc
% Vo
Vdc
%Vo,nom
%Vo,nom
mVp-p
A
A
%
µF
mV
µs
V
A
All specifications at Ta=25C, Vin=48V, 300 LFM unless otherwise specified
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1
Q
-ClassConverters
QHS50-018 Model
Parameter
Input
Conditions
Input Voltage (Vin)
Reflected Ripple Current (see note 1)
Input Current
Inrush Transient
Input Voltage Transient 100mS 10% duty cycle
Undervoltage Lockout
Turn-on
Turn-off
Over-voltage lockout
Turn-off
Turn-on
Input-Output
Resistance; input-output
Operating Ambient
Storage
Over-Temperature
Measured on PCB
Min.
36
--
Typ.
48
--
Max.
75
10
3
0.2
100
35
34
80
79
Units
Vdc
mA p-p
A
A
2
s
V
Vdc
Vdc
Vdc
Vdc
Vdc
Mohm
°C
°C
Deg C
Isolation
Temperature
Protection
32
31
76
75
1500
10
-40
-40
--
--
--
120
85
125
--
Physical Information Dimensions
MTBF(Bellcore)
Safety
2.28”L x 1.45” W x 0.47”H (57.91 x 36.83 x 11.8 mm)
1,000,000 Hrs
Calculated at 40C ambient, 100% Iomax:
Complies with IEC/EN/CSA/UL 60950, provides basic insulation, input to output.
c-UL-us (US and Canada) recognized. TUV (Bauart) approved.
Thermal Derating Parallel Airflow Tj =110C
Thermal Derating Transverse Airflow Tj=110C
55
50
45
55
50
45
35
30
25
20
15
10
20
30
40
50
60
70
80
200lfm
300lfm
400lfm
Current (A)
Current (A)
40
40
35
30
25
20
15
10
20
30
40
50
60
70
80
200lfm
300lfm
400lfm
Ambient Temp. (C)
Ambient Temp. (C)
Thermal Derating Parallel Airflow Tj=125C
55
50
45
Current (A)
40
35
30
25
20
15
10
20
30
40
50
60
Ambient Temp. (C)
70
80
200lfm
300lfm
400lfm
55
50
45
Currewnt (A)
40
35
30
25
20
15
10
20
Thermal Derating Transverse Airflow Tj=125C
200lfm
300lfm
400lfm
30
40
50
60
Ambient Temp. (C)
70
80
4118 14
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Avenue, Unit 4
Markham, Ontario L3R 0J3
1-866-740-1232
QHS50-6201031512_C03_04Jan07
www.cd4power.com
Page
2
Q
-ClassConverters
QHS50-018 Model
x
Pin Assignments
Pin #
1
2
3
Notes:
1. Input Reflected Ripple is specified when measured with the filter shown below.
i
s
L2
Description
Vin (+)
Enable
Vin(-)
Pin #
4
5
6
Description
Vout(-)
Sense -
Vo adj
Pin #
7
8
Description
Sense +
Vo (+)
i
c
Vin
12uF
220uF,
ESR<0.1 Ohms
@ 100kHz
33uF,
ESR<0.7 Ohms
@ 100kHz
DC-DC
Converter
RTN
2. Output Ripple and noise is specified when measured with a 10uF tantalum and a 1uF ceramic
capacitor at the converter output pins.
3. Transient response is specified without a capacitor at the output of the converter.
4. The Enable signal is Logic Low. It is referenced to Vi-. The pin should be tied to Vi- if it is not
used. Isink = 1mA max, Voff = 15V max.
4118 14
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Avenue, Unit 4
Markham, Ontario L3R 0J3
1-866-740-1232
QHS50-6201031512_C03_04Jan07
www.cd4power.com
Page
3
Q
-ClassConverters
QHS50-018 Model
QHS50-018 Output Impedance
Output Ripple and Noise (Vin=48V, Io=50A, full BW)
Output Ripple and Noise (Vin=48V, Io=50A, 20Mz BW)
Output Voltage Response to Step Load (50-75% load step, di/dt = 1A/us, Tamb=25C, Vin=48V)
4118 14
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Avenue, Unit 4
Markham, Ontario L3R 0J3
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QHS50-6201031512_C03_04Jan07
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Page
4
Q
-ClassConverters
QHS50-018 Model
QHS50-018 Efficiency
90
88
86
84
Input Reflected Ripple
(Vin=48V, Iout=50A)
PM3380A
ch1
ch1:
pkpk= 1.51mV
Efficiency (%)
82
80
78
76
74
72
70
0
10
20
75V
48V
36V
T
1
Current (A)
30
40
50
60
CH1
2mV=
BWL MTB5.00us- 1.06dv ch1+
Startup Characteristics
Vin = 48V Iout = 0A Local O/P Sensing
PM3380A
ch1
ch2
ch1:
rise= 2.27ms
Vin = 48V Iout = 50A Local O/P Sensing
PM3380A
ch1
ch1:
rise= 1.93ms
T
T
2
1
1
CH1 0.5 V=
CH2 2.00 V=
MTB1.00ms- 2.32dv ch1+
CH1
0.5 V=
MTB1.00ms- 4.34dv ch1+
Conducted EMI Characteristic with
external filter as specified
4118 14
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Avenue, Unit 4
Markham, Ontario L3R 0J3
1-866-740-1232
QHS50-6201031512_C03_04Jan07
www.cd4power.com
Page
5
