Technical Specification
Quarter
Brick
24Vin 12Vout 8.3A
100 Watts, No Heatsink, Isolated DC/DC Converter
The PQ24120QGA08 PowerQor™ Giga quarter-
brick converter is a next-generation, board-mount-
able, isolated, fixed switching frequency dc/dc
converter that uses synchronous rectification to
achieve extremely high conversion efficiency. The
power dissipated by the converter is so low that a
heatsink is not required, which saves cost, weight,
height, and application effort. All of the power and
control components are mounted to the multi-layer
PCB substrate with high-yield surface mount technolo-
gy. Since the PowerQor converter has no explicit
thermal connections, it is extremely reliable.
PQ24120QGA08 Module
Operational Features
• High efficiency, >88% at full rated load current
• Delivers up to 8.3 amps of output current (100W)
with minimal derating - no heatsink required
• Wide input voltage range: 18V – 36V meets or
exceeds all 24V bus standards
• Fixed frequency switching provides predictable EMI
performance
• No minimum load requirement means no preload
resistors required
Protection Features
• Input under-voltage lockout disables converter at
low input voltage conditions
• Output current limit and short circuit protection
protects converter from excessive load current or
short circuits
• Output over-voltage protection protects load from
damaging voltages
• Thermal shutdown protects converter from abnor-
mal environmental conditions
Mechanical Features
• Industry standard quarter-brick pin-out configuration
• Industry standard size: 1.45” x 2.3”
• Total height less than 0.40”, permits better airflow
and smaller card pitch
• Total weight: 34 grams (1.2 oz.), lower mass great-
ly reduces vibration and shock problems
Safety Features
• 2000V, 10 MΩ input-to-output isolation provides
input/output ground separation
• UL 1950 recognized (US & Canada), basic insula-
tion rating
(pending)
• TUV certification to EN60950
(pending)
• Meets 72/23/EEC and 93/68/EEC directives
which facilitates CE Marking in user’s end product
• Board and plastic components meet 94V-0 flamma-
bility requirements
• NEBS and ETSI compliant
Control Features
• On/Off control referenced to input side (positive
and negative logic options are available)
• Remote sense for the output voltage compensates
for output distribution drops
• Output voltage trim permits custom voltages and
voltage margining
Product # PQ24120QGA08
Phone 1-888-567-9596
Doc.# 005-2QG212D_A
3/1/02
Page 1
Technical Specification
Quarter
Brick
0.14
(3.6)
(58.4)
24Vin 12Vout 8.3A
2.30
(50.8)
2.00
0.300
0.150
(7.62)
(3.81)
(10.9)
0.43
(36.8)
1.45
(15.24)
0.600
Top View
(11.43)
0.450
(15.24)
0.600
0.300
(7.62)
(10.2)
0.40
(3.68)
See Note 3
0.145
Side View
1) Pins 1-3, 5-7 are 0.040” (1.02mm) dia. with
0.080” (2.03mm) dia. standoff shoulders.
2) Pins 4 and 8 are 0.062” (1.57 mm) dia. with 0.100”
(2.54mm) dia. standoff shoulders.
3) Other pin extension lengths available.
4) Undimensioned components are for visual reference only.
5) Weight: 1.2 oz. (34g) typical
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) Workmanship: Meets or exceeds IPC-A-610B Class II
Shown Actual Size
Pin No.
1
2
3
4
5
6
7
8
Notes:
Name
Vin(+)
ON/OFF
Vin(-)
Vout(-)
SENSE(-)
TRIM
SENSE(+)
Vout(+)
Function
Positive input voltage (18 - 36V)
TTL input to turn converter
on and off, referenced to
Vin(-), with internal pull up.
Negative input voltage
Negative output voltage
Negative remote sense
1
Output voltage trim
2
Positive remote sense
3
Positive output voltage
ABSOLUTE MAXIMUM RATINGS
Input Voltage:
Non-Operating: 50V continuous
Operating:
40V continuous
50V
10µs transients
,
1% duty cycyle
Input/Output Isolation Voltage: 2000V
Storage Temperature: -55°C to +125°C
Operating Temperature: -40°C to +115°C
Voltage at ON/OFF input pin: +18V / -2V
1. Pin 5 should be connected to Vout(-) at load.
2. Leave Pin 6 open for nominal output voltage.
3. Pin 7 should be connected to Vout(+) at load.
OPTIONS
• Logic sense - Negative (N); converter is on when the
ON/OFF signal is low. Positive (P); converter is on
when the ON/OFF signal is high. Logic input is TTL
compatible with an internal pull up. Use N or P as
13th letter in part number to indicate logic.
• Pin Length - a variety of pin lengths are available for
all modules (see last page). The14th letter in the part
number indicates pin length.
• Feature Set - Quarter-bricks are available with
Standard (S) feature options only. Use S as 15th letter
in part number to indicate feature set.
Product # PQ24120QGA08
Phone 1-888-567-9596
SAFETY
• UL 1950 - All modules are UL 1950 recognized (US &
Canada) with basic insulation rating.
• EN60950 - All modules are TUV certified to EN60950
requirements.
• 72/23/EEC - All modules meet 72/23/EEC directives.
• 93/68/EEC - All modules meet 93/68/EEC directives.
• 94V-0 - All modules meet 94V-0 flammability require-
ments for board and plastic components.
• NEBS - All modules meet NEBS compatibility.
• An external input fuse must always be used to meet
these safety requirements.
Doc.# 005-2QG212D_A
3/1/02
Page 2
Technical Specification
Quarter
Brick
PQ24120QGA08 ELECTRICAL CHARACTERISTICS
T
A
=25°C, airflow rate=300 LFM, V
in
=24Vdc, nominal Vout unless otherwise noted; full operating temperature range is -40°C to
+115°C ambient temperature with appropriate power derating. Specifications subject to change without notice.
24Vin 12Vout 8.3A
PARAMETER
INPUT CHARACTERISTICS
NOTES and CONDITIONS
Min.
18
15.5
14.0
1.0
PQ24120QGA08
Typ.
24
16.0
14.5
1.5
160
1.6
10
11.82
12.00
+0.05 (5)
+0.05 (5)
+90
80
20
9.6
18
60
500
550
400
4
180
8
200
88
88
125
125
125
2000
10
280
-2
2.4
2.4
-2
12
215
2,000
Max.
36
16.5
15.0
2.0
6.3
320
3
12.18
+0.2 (24)
+0.2 (24)
+240
12.42
160
40
8.33
11
20
Units
V
V
V
V
A
mA
mA
mA
V
% (mV)
% (mV)
mV
V
mV
mV
A
A
A
dB
mV
mV
µs
ms
ms
µF
%
%
°C
°C
°C
V
M
Ω
pF
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
Maximum Input Current
No-Load Input Current
Off Converter Input Current
Input Reflected-Ripple Current
100% Load, 18Vin
P-P thru 3.3µH inductor; Figures 13 & 15
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
Short-Circuit Protection (redundant shutdown)
Input Voltage Ripple Rejection
Output Voltage Current Transient
Positive Step Change in Output Current
Negative Step Change in Output Current
Settling Time to within 1% Vout nominal
Turn-On Transient
Turn-On Time
Start-Up Inhibit Period
Maximum Output Capacitance
100% Load
50% Load
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
Isolation Voltage
Isolation Resistance
Isolation Capacitance
over sample line, load and temperature
20MHz bandwidth; Figures 13 & 16
Full Load, 1µF ceramic, 10µF tantalum
Full Load, 1µF ceramic, 10µF tantalum
Output Voltage 10% Low; Fig. 17 & 18
120 Hz; Figure 20
470µF load cap, 5A/µs; Figure 12
50% Io to 75% Io
75% Io to 50% Io
Full load, Vout=90% nom.; Figs 9 & 10
-40°C to +125°C; Figure F
Full load; 5% overshoot of V
out
at startup
Figure 1
Plastic Package rated to 150°C
Board rated to 165°C
Figures 5 - 8
11.58
0
9
16
DYNAMIC CHARACTERISTICS
EFFICIENCY
TEMPERATURE LIMITS FOR POWER DERATING CURVES
ISOLATION CHARACTERISTICS
470
300
320
0.8
18
18
0.8
Vin/3
33
122
125
9.6
+10
127
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control (Option P)
Off-State Voltage
On-State Voltage
ON/OFF Control (Option N)
Off-State Voltage
On-State Voltage
ON/OFF Control (Either Option)
Pull-Up Voltage
Pull-Up Resistance
Output Voltage Trim Range
Output Over-Voltage Protection
Over-Temperature Shutdown
kHz
V
V
V
V
V
k
Ω
%
%
°C
See circuit diagram; Figure B
Pull up to Vin/3
Across Pins 8 & 4; Figures C & D
Over full temp range; % of nominal Vout
Average PCB Temperature
-20
117
Patents:
SynQor is protected under various patents, including but not limited to U.S. Patent # 5,999,417.
Product # PQ24120QGA08
Phone 1-888-567-9596
Doc.# 005-2QG212D_A
3/1/02
Page 3
Performance Curves
Quarter
Brick
90
89
88
Efficiency (%)
95
90
85
24Vin 12Vout 8.3A
Efficiency (%)
80
75
70
65
60
0.0
0.8
1.7
2.5
3.3
4.2
5.0
5.8
6.7
7.5
8.3
18Vin
24Vin
36Vin
87
86
85
84
83
82
0
100
200
300
400
Air Flow (LFM)
25 C
40 C
55 C
500
Load Current (A)
Figure 1:
Efficiency at nominal output voltage vs. load current for min-
imum, nominal, and maximum input voltage at 25
°
C.
Figure 2:
Efficiency at nominal output voltage and60% rated power vs.
airflow rate for ambient air temperatures of 25
°
C, 40
°
C, and 55
°
C
(nominal input voltage).
10.0
9.5
Power Dissipation (W)
18
16
Power Dissipation (W)
14
12
10
8
6
4
2
0
0.0
0.8
1.7
2.5
3.3
4.2
5.0
5.8
6.7
9.0
8.5
8.0
7.5
7.0
6.5
6.0
0
100
200
300
400
Air Flow (LFM)
25 C
40 C
55 C
18Vin
24Vin
36Vin
7.5
8.3
Load Current (A)
500
Figure 3:
Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25
°
C.
Figure 4:
Power dissipation at nominal output voltage and 60% rated
power vs. airflow rate for ambient air temperatures of 25
°
C, 40
°
C, and
55
°
C (nominal input voltage).
8
7
6
I
out
(A)
5
4
3
2
1
0
0
25
40
55
o
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
70
85
Vin = 24V
Ambient Air Temperature ( C)
Figure 5:
Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
from input to output (nominal input voltage).
Product # PQ24120QGA08
Phone 1-888-567-9596
Figure 6:
Thermal plot of converter at 5.7 amp load current with 55
°
C
air flowing at the rate of 200 LFM. Air is flowing across the converter
from input to output (nominal input voltage).
Doc.# 005-2QG212D_A
3/1/02
Page 4
Semiconductor junction temperature is
within 1°C of surface temperature
Performance Curves
Quarter
Brick
8
7
6
24Vin 12Vout 8.3A
Semiconductor junction temperature is
within 1°C of surface temperature
I
out
(A)
5
4
3
2
1
0
0
25
40
55
o
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
70
85
Vin = 24V
Ambient Air Temperature ( C)
Figure 7:
Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
from pin 1 to pin 3 (nominal input voltage).
Figure 8:
Thermal plot of converter at 5.5 amp load current with 55
°
C
air flowing at the rate of 200 LFM. Air is flowing across the converter
from pin 1 to pin 3 (nominal input voltage).
Figure 9:
Turn-on transient at full load (resistive load) (2 ms/div).
Ch1: Vout (5V/div)
Ch2: ON/OFF input (5V/div)
Figure 10:
Turn-on transient at zero load (2 ms/div).
Ch1: Vout (5V/div)
Ch2: ON/OFF input (5V/div)
Figure 11
:
Output voltage response to step-change in load current (50%-75%-50%
of Iout(max); dI/dt = 0.1A/µs). Load cap: 10µF, 100 m
Ω
ESR tantalum capacitor and
1µF ceramic capacitor. Ch1: Vout (500mV/div), Ch2: Iout (5A/div).
Phone 1-888-567-9596
Figure 12
:
Output voltage response to step-change in load current (50%-75%-
50% of Iout(max): dI/dt = 5A/µs). Load cap: 470µF, 30 m
Ω
ESR tantalum capaci-
tor and 1µF ceramic capacitor. Ch1: Vout (500mV/div), Ch2: Iout (5A/div).
Doc.# 005-2QG212D_A
3/1/02
Page 5
Product # PQ24120QGA08
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