TI PT4243A

PT4240 Series
10-W Low-Profile 24V-Input
Isolated DC/DC Converter
SLTS145A
(Revised 1/14/2002)
Features
•
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•
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10W Output Power
Input Voltage: 18V to 36V
Output Voltages: 1.2V to 13.2V
1500 VDC Isolation
Temp Range: –40°C to +85°C
Remote On/Off Control
Undervoltage Lockout
Output Current Limit
Description
•
•
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Short-Circuit Protection
Low-Profile Package (8mm)
Space Saving Package
Solderable Copper Case
Safety Agency Approvals:
UL 60950
CSA 22.2 60950
Ordering Information
The PT4240 power modules are a
series of DC/DC converters housed in
an ultra-low profile (8mm) solderable
copper case. The series includes a number of preset output voltages ranging
from 1.3V † up to 12V, all fully approved
for Telecom use. They may also be used
in many other applications that require
input-output isolation over an extended
temperature range. The modules are an
ideal choice for low-power digital and
analog circuits, including DSPs and
microcontrollers. The flexibility of
input-output isolation also allows the
output to be configured for negative
voltage operation.
The PT4240 series is made available
in both horizontal and vertical pin configurations, including surface mount.
PT4241¨
PT4242¨
PT4243¨
PT4244¨
PT4245¨
PT4246¨
† PT4247¨
=1.8V/3A
=3.3V/3A
=5.0V/2A
=12.0V/0.85A
=2.5V/3A
=1.5V/3A
=1.3V/3A
Pin-Out Information
(5.4W)
Pin
Remote On/Off *
2
Do not connect
3
–Vin
4
Do not connect
5
+Vin
6
-Vout
7
-Vout
PT Series Suffix (PT1234 x )
8
+Vout
Case/Pin
Configuration
9
+Vout
(7.5W)
(4.5W)
(3.9W)
† Adjustable to 1.2V
Order
Suffix
N
A
C
Vertical
Horizontal
SMD
Package
Code
10 Vout Adj *
(EPE)
(EPF)
(EPG)
* For further information, see
application notes.
(Reference the applicable package code drawing for the dimensions and PC board layout)
Standard Application
+V out
+V in
5
+ V in
+ V out
8, 9
L
O
A
D
PT4240
3
-V in
-V in
Function
1
Remote
On/Off
1
For technical support and more information, see inside back cover or visit www.ti.com
-Vout
V o (adj)
10
6, 7
-V out
PT4240 Series
10-W Low-Profile 24V-Input
Isolated DC/DC Converter
Specifications
(Unless otherwise stated, T a =25°C, Vin =24V, Cin =0µF, Cout =0µF, and Io =Iomax)
Characteristic
Symbol
Conditions
Output Current
Io
Over Vin range
Input Voltage Range
Set Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
Vin
Vo tol
Regtemp
Regline
Regload
∆Votot
Over Io Range
Efficiency
η
Min
Vo ≤ 3.3V
Vo =5.0V
Vo = 12V
–40° ≤Ta ≤ +85°C, Io =Iomin
Over Vin range
Over Io range
Includes set-point, line, load,
–40° ≤Ta ≤ +85°C
Vo = 12V
Vo = 5.0V
Vo = 3.3V
Vo = 2.5V
Vo = 1.8V
Vo = 1.5V
Vo = 1.3V
Vo ≤ 5.0V
Vo = 12V
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
Transient Response
ttr
1A/µs load step, 50% to 100% Iomax
Vo over/undershoot
Vo ≤ 5.0V
Vo = 12V
Vo ≥2.5V
Vin =18V, ∆Vo = –1%
Over Vin range
∆Vtr
Output Voltage Adjust
Current Limit Threshold
Switching Frequency
Under-Voltage Lockout
Remote On/Off (Pin 1)
Input High Voltage
Input Low Voltage
Input Low Current
Standby Input Current
Internal Input Capacitance
External Output Capacitance
Vadj
Ilim
ƒs
UVLO
VIH
VIL
IIL
Iin standby
Cin
Cout
Isolation Voltage
Capacitance
Resistance
Operating Temperature Range
Storage Temperature
Reliability
Ta
Ts
MTBF
Mechanical Shock
—
Mechanical Vibration
—
Weight
Flammability
—
—
Referenced to –Vin (pin 3)
pins 1 & 3 connected
Vo ≤ 5.0V
Vo = 12V
Input–output/input–case
Input to output
Input to output
Over Vin range
—
Per Bellcore TR-332
50% stress, Ta =40°C, ground benign
Per Mil-Std-883D, method 2002.3,
1mS, half-sine, mounted to a fixture
Mil-Std-883D, Method 2007.2
20-2000Hz, all case styles soldered to PC
—
Materials meet UL 94V-0
PT4240 SERIES
Typ
Max
Units
0.1 (1)
0.1 (1)
0.1 (1)
18.0
—
—
—
—
—
—
—
24.0
±1
±0.2
±1
±5
3
2
0.85
36.0
±2
—
—
—
VDC
%Vo
%Vo
mV
mV
—
±1.5
±3
%Vo
—
—
—
—
—
—
—
—
—
—
—
—
±10
—
250
—
86
84
80
77
72
70
64
50
100
75
±150
±350
—
150
300
16
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
—
4.5
–0.2
—
—
—
0 (5)
0 (5)
1500
—
10
-40
-40
—
—
–0.5
1
0.66
—
—
—
1,100
—
—
—
Open (3)
+0.8
—
—
—
1000
330
—
—
—
+85 (4)
+125
V
pF
MΩ
°C
°C
4.7
—
—
106 Hrs
—
500
—
G’s
—
20 (6)
—
G’s
—
20
—
grams
%
mVpp
µs
mV
%Vo
%Iomax
kHz
V
V
mA
mA
µF
µF
Notes: (1) The DC/DC converter will operate at no load with reduced specifications.
(2) The maximum output current reduces the output power of the following devices to less than 10W:PT4245 =7.5W; PT4241 =5.4W; PT4246 =4.5W; PT4247 =3.9W.
(3) The Remote On/Off (pin 1) has an internal pull-up, and if it is left open circuit the converter will operate when input power is applied. The open-circuit
voltage is typically 5V. Refer to the application notes for interface considerations.
(4) See Safe Operating Area curves or contact the factory for the appropriate derating.
(5) An output capacitor is not required for proper operation.
(6) The case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing.
For technical support and more information, see inside back cover or visit www.ti.com
PT4240 Series
10-W Low-Profile 24V-Input
Isolated DC/DC Converter
PT4242, Vo =3.3VDC
PT4243, Vo =5.0VDC
(See Note A)
Efficiency vs Output Current
36.0V
30.0V
75
24.0V
18.0V
70
Efficiency - %
VIN
80
90
80
VIN
70
36.0V
30.0V
24.0V
18.0V
VIN
80
Efficiency - %
85
(See Note A)
Efficiency vs Output Current
Efficiency vs Output Current
90
90
Efficiency - %
PT4244, Vo =12.0VDC
(See Note A)
60
36.0V
30.0V
70
24.0V
18.0V
60
65
50
60
0
0.5
1
1.5
2
2.5
50
0
3
0.4
0.8
1.2
1.6
2
0
Output Ripple vs Output Current
30
VIN
18.0V
24.0V
30.0V
36.0V
30
20
VIN
Ripple - mV
40
20
10
0
0.5
1
1.5
2
2.5
3
0.4
1.6
2
0
1.5
1
2
2.5
1.5
36.0V
24.0V
1
30.0V
18.0V
1
VIN
18.0V
24.0V
30.0V
36.0V
1.5
1
0.5
0
0
3
0.8
2
VIN
0
0
0.6
Power Dissipation vs Output Current
0.5
0.5
0.4
2.5
Pd - Watts
18.0V
24.0V
30.0V
36.0V
1.5
0.2
Iout (A)
2
VIN
2
Pd - Watts
0.4
0.8
1.2
1.6
2
0
0.2
0.4
Iout (A)
Iout (A)
0.6
0.8
1
Iout (A)
Safe Operating Area @Vin =24V (Note B)
Safe Operating Area @Vin =24V (Note B)
90.0
90.0
90.0
80.0
Airflow
70.0
200LFM
120LFM
60LFM
Nat conv
60.0
50.0
40.0
30.0
Ambient Temperature (°C)
Safe Operating Area @Vin =24V (Note B)
80.0
Airflow
70.0
200LFM
120LFM
60LFM
Nat conv
60.0
50.0
40.0
30.0
20.0
20.0
0.0
0.5
1.0
1.5
Iout (A)
2.0
2.5
3.0
Ambient Temperature (°C)
Pd - Watts
1.2
2.5
2.5
Ambient Temperature (°C)
0.8
Power Dissipation vs Output Current
Power Dissipation vs Output Current
1
40
Iout (A)
3
0.5
18.0V
24.0V
30.0V
36.0V
60
0
0
Iout (A)
0
80
20
10
0
1
100
40
Ripple - mV
Ripple - mV
18.0V
24.0V
30.0V
36.0V
0.8
120
60
VIN
0.6
Output Ripple vs Output Current
Output Ripple vs Output Current
50
0.4
Iout (A)
50
70
0
0.2
Iout (A)
Iout (A)
80.0
Airflow
Nat conv
60LFM
120LFM
200LFM
70.0
60.0
50.0
40.0
30.0
20.0
0.0
0.4
0.8
1.2
Iout (A)
1.6
2.0
0.0
0.2
0.4
0.6
0.8
1.0
Iout (A)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the converter.
Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4220/4240 Series
Using the Remote On/Off with the PT4220/4240
Isolated 10W Excalibur DC/DC Converters
For applications requiring output voltage On/Off control,
the PT4220/4240 DC/DC converter series incorporates
a “Remote On/Off” control (pin 1). This feature can be
used to switch the module off without removing the
applied input source voltage.
The converter functions normally with Pin 1 open-circuit,
providing a regulated output voltage when a valid source
voltage is applied to +Vin (pin 5), with respect to –V in
(pin 3). When a low-level 1 ground signal is applied to
pin 1, the converter output will be turned off.
Figure 1 shows an application schematic, which details
the typical use of the Remote On/Off function. Note the
discrete transistor (Q1). The pin has its own internal
pull-up, allowing it to be controlled with an open-collector
or open-drain device (See notes 2 & 3). Table 1 gives the
threshold requirements.
Table 2; UVLO Thresholds 4
Series
Vin Range
PT4220
36 – 75V
UVLO Threshold
32V ±2V
PT4240
18 – 36V
15.8V ±2V
Figure 1
5
+ V in
+Vin
+Vout
8, 9
+Vo
6, 7
-V o
PT4220/4240
-V in
3
Note 1
-Vin Remote
On/Off
1
-Vout
V o (adj)
10
Q1
BSS138
1 =OFF
Note 1
Vdd
R1
10k
U1a
Note 1
When placed in the “Off” state, the standby current drawn
from the input source is typically reduced to less than 1mA.
Table 1; Pin 1 Remote On/Off Control Parameters 1
Parameter
Min
Typ
Enable (V IH)
4.5V
—
—
Disable (VIL)
—
—
0.8V
Vo/c [Open-Circuit]
Iin [pin 1 at –Vin]
Max
5.0V
—
—
–0.5mA
Notes:
1. The Remote On/Off control uses –Vin (pin 3) as its ground
reference. All voltages specified are with respect to –Vin.
2. Use an open-collector device (preferably a discrete
transistor) for the Remote On/Off input. A pull-up resistor
is not necessary. To disable the output voltage, the control
pin should be pulled low to less than +0.8VDC.
Turn-On Time: In the circuit of Figure 1, turning Q1 on
applies a low-voltage to pin 1 and disables the converter
output. Correspondingly, turning Q1 off allows pin 1 to
be pulled high by an internal pull-up resistor. The converter produces a regulated output voltage within 60ms.
Figure 2 shows shows the output response of a PT4223
(5.0V) following the turn-off of Q1. The turn off of Q1
corresponds to the drop in Q1 Vgs. Although the risetime of the output voltage is short (<5ms), the indicated
delay time will vary depending upon the input voltage
and the module’s internal timing. The waveform was
measured with a 48Vdc input voltage, and a 1.4A resistive load.
Figure 2
3. The Remote On/Off pin may be controlled with devices that
have a totem-pole output. This is provided the drive
voltage meets the threshold requirements in Table 1.
Do not apply more than +20V. If a TTL gate is used, a
pull-up resistor may be required to the logic supply voltage.
Vo (2V/Div)
Iin (0.2A/Div)
4. The PT4220/4240 converters incorporate an “UnderVoltage Lockout” (UVLO). The UVLO will keep the
module off when the input voltage to the converter is
low, regardless of the state of the Remote On/Off control.
Table 2 gives the UVLO input voltage thresholds.
Delay Time
Q1Vgs (10V/Div)
HORIZ SCALE: 10ms/Div
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Application Notes
PT4220/4240 Series
Adjusting the Output Voltage of the 10W-Rated
Excalibur™ Series of Isolated DC/DC Converters
The factory pre-set output voltage of Power Trends’ 10W
Excalibur series of isolated DC-DC converters may be
adjusted over a narrow range. This is accomplished with
the addition of a single external resistor. For the input
voltage range specified in the data sheet, Table 1 gives the
allowable adjustment range for each model as Vo (min)
and Vo (max).
R2
68.845
Va – Vo
=
Where,
Vo
Va
Rs
– Rs
kΩ
= Original output voltage
= Adjusted output voltage
= Internal resistance (Table 1)
Notes:
Adjust Up: An increase in the output voltage is obtained
by adding a resistor, R2 between pin 10 (Vo adjust), and
pins 6 & 7 (–Vout).
1. Use only a single 1% resistor in either the (R1) or R2
location. Place the resistor as close to the ISR as possible.
Adjust Down: Add a resistor (R1), between pin 10 (Vo adjust)
and pins 8 & 9 (+Vout).
2. Never connect capacitors to Vo adjust. Any capacitance
added to the Vo adjust control pin will affect the stability of
the ISR.
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor, (R1) or R2.
3. The output power is limited to 10W. If the output
voltage is increased, the maximum load current must be
derated according to the following equation.
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas.
(R1)
=
56.2 (Va – 1.225)
Vo – Va
– Rs
= 10
Va
Io(max)
In any instance, the load current must not exceed the
converter’s rated current (See Table 1).
kΩ
Table 1
DC/DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt #
24V Bus
48V Bus
Rated Current 3
PT4247
PT4227
3A
PT4246
PT4226
3A
PT4241
PT4221
3A
PT4245
PT4225
3A
PT4242
PT4222
3A
PT4243
PT4223
2A
PT4244
PT4224
0.85A
Vo(nom)
Vo(min)
Vo(max)
Ω)
Rs (kΩ
1.3V
1.2V
1.4V
340.0
1.5V
1.45V
1.65V
243.0
1.8V
1.7V
1.98V
243.0
2.5V
2.25V
2.75V
187.0
3.3V
2.95V
3.65V
187.0
5.0V
4.5V
5.5V
110.0
12.0V
10.8V
13.2V
49.9
Figure 1
+V in
5
+ V in
+ V out
+V O
8, 9
PT4220/4240
3
-V in
-V in
Remote
On/Off
1
-V out
V o (adj)
6, 7
(R1)
Adj Down
L
O
A
D
10
R2
Adjust Up
–V O
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes continued
PT4220/4240 Series
Table 2
DC/DC CONVERTER ADJUSTMENT RESISTOR VALUES
Series Pt #
24V Bus
48V Bus
Vo(nom)
Va(req’d)
1.2
1.25
1.3
1.35
1.4
1.45
1.5
1.55
1.6
1.65
1.7
1.75
1.8
1.85
1.9
1.95
2.25
2.3
2.35
2.4
2.45
2.5
2.55
2.6
2.65
2.7
2.75
2.95
3.0
3.05
3.1
3.15
3.2
3.25
3.3
3.35
3.4
3.45
3.5
3.55
3.6
3.65
R1 = (Blue)
PT4247
PT4227
PT4246
PT4226
PT4241
PT4221
PT4245
PT4225
PT4242
PT4222
1.3V
1.5V
1.8V
2.5V
3.3V
PT4243
PT4223
5.0V
Va(req’d)
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
10.8
11.0
11.5
12.0
12.5
13.0
13.2
(0.0)kΩ
(340.0)kΩ
340.0kΩ
0.0.0kΩ
(9.9)kΩ
1130.0kΩ
445.0kΩ
216.0kΩ
(23.9)kΩ
(347.0)kΩ
1130.0kΩ
445.0kΩ
216.0kΩ
(43.4)kΩ
(115.0)kΩ
(235.0)kΩ
(473.0)kΩ
(1190.0)kΩ
PT4244
PT4224
12.0V
(258.0)kΩ
(364.0)kΩ
(541.0)kΩ
(895.0)kΩ
(1960.0)kΩ
578.0kΩ
234.0kΩ
119.0kΩ
62.1kΩ
27.7kΩ
(399.0)kΩ
(499.0)kΩ
(1110.0)kΩ
87.8kΩ
18.9kΩ
7.5kΩ
1190.0kΩ
501.0kΩ
272.0kΩ
157.0kΩ
88.4kΩ
(90.0)kΩ
(146.0)kΩ
(223.0)kΩ
(340.0)kΩ
(534.0)kΩ
(923.0)kΩ
(2090.0)kΩ
1190.0kΩ
501.0kΩ
272.0kΩ
157.0kΩ
88.4kΩ
42.5kΩ
9.7kΩ
R2 = Black
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