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PT3320 Series--48V
30 Watt 48V Input Isolated DC-DC Converter
SLTS018A
(Revised 6/30/2000)
The PT3320 is a series of high-input voltage, 30 Watt DC to DC converters, housed in a vertical or horizontal 19-pin SIP package. These regulators are fully isolated for operation from a 36 to 75V input voltage source, making them suitable for telecom and other applications that utilize a 48V distributed power bus. The PT3320 series is available with output voltages from 1.8V to 15V.
Patent pending*
The output voltage is adjustable from 90 to 110% of nominal with the addition of an external resistor. Features include an inhibit function and a differential remote sense to compensate for voltage drop between the regulator and load. The PT3320 includes built in current limit, short circuit protection, and overtemperature shutdown. The PT3320 requires a 330F output capacitor for proper operation.
Standard Application
VO Adjust
18 19
Pin-Out Information
Pin Function
+REMOTE SENSE
Features
Pin Function
10 11 12 13 14 15 16 17 18 19 -Vo -Vo -Vo -Remote Sense +Vo +Vo +Vo +Vo Vo Adjust(4) +Remote Sense
+VIN
1 2 3
LOAD
Do Not Use Inhibit(4) Do Not Use -V in -V in -V in +V in +V in +V in
7-9
2
PT3320
4-6 13 10-12
14-17
+VO
CIN Inhibit -V IN
+ Q1
COUT
+ -V O
4 5 6 7 8 9
-REMOTE SENSE
Cin = Optional 100F/100V electrolytic Cout = Required 330F electrolytic Q1 = NFET
Preliminary Specifications
Characteristics (Ta = 25C unless noted) Output Current Symbols Io Iin standby Isc Vin Vo Regline Regload Vn ttr Conditions Over Vin range Vo = 3.3V Vo = 5V Vo = 12V Min 0.25 0.25 0.1 -- -- 36.0 -- -- -- -- -- -- -- -- -- -- 600 400 -40 (1) -40
PT3320 SERIES
Typ -- -- -- 8 2xIomax 48.0 1.0 0.5 0.5 1.0 50 100 3.0 80 84 85 750 500 -- -- 500 10 40 -- 1200 -- Max 8.0 6.0 2.5 16 -- 75.0 2.0 1.0 1.0 2.0 75 200 5.0 -- -- -- 900 600 +85 (2) +125 -- -- -- -- -- -- Units A mA A V %Vo %Vo %Vo %Vo mVpp Sec %Vo % kHz C C G's G's grams VDC pF M
On/Off Standby Current Short Circuit Current Input Voltage Range Output Voltage T olerance Line Regulation Load Regulation Vo Ripple/Noise Transient Response Efficiency
Vin = 48V, Pin 1 = -Vin Vin = 48V Over Io Range Over Vin Range TA= -40C to +85C Over Vin range @ max Io 10% to 100% of Io max Vin=48V, Io=I o max, Vo>5V Vin=48V, Io=I o max, Vo<5V 50% load change, 1A/Sec Vo over/undershoot, Vo>5V Vin=48V, Io=6A, Vo=3.3V Vin=48V, Io=6A, Vo=5V Vin=48V, Io=2.5A, Vo=12V Over Vin and Io -- -- Vo<10V Vo>10V
* Input Voltage Range: 36V to 75V * 1500 VDC Isolation * Vo Inhibit * Vo Adjust * Differential Remote Sense * Current Limit * Short-Circuit Protection * Over-T emperature Shutdown * Undervoltage Lockout * Flexibile SIP Package * UL1950 recognized * CSA 22.2 950 certified * EN60950 Approved * VDE Licensed * Within FCC Class A Radiated Limits
Ordering Information
PT3321 PT3322 PT3323 PT3324 PT3325 PT3326 PT3327 PT3328 = 3.3V/8A = 5.0V/6A = 12.0V/2.5A = 15.0V/2A = 2.0V/8A = 2.5V/8A = 1.8V/8A = 5.2V/6A
Switching Frequency Absolute Operating Temperature Range Storage T emperature Mechanical Shock Mechanical Vibration Weight Input/Output Isolation Capacitance Resistance Flammability Inhibit (pin 2)
o Ta Ts -- -- -- -- -- -- --
PT Series Suffix (PT1234X)
Case/Pin Configuration
Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount
Per Mil-Std-883D, method 2002.3, 1mS, half-sine, mounted to a fixture -- Per Mil-Std-883D, method 2007.2, 20-2000Hz, soldered in a PC board -- -- -- -- Materials meet UL 94V-0 -- -- 1500 -- 10
N A C
(For dimensions and PC board layout, see Package Styles 840 and 850.) : This product is the subject of one or more patents. Other patents pending.
On (3) 2.5 -- 15 Referenced to -Vin VDC Off 0 -- 0.8 Notes (1) At temperatures below 0C, the PT3320 series requires output capacitors with temperature stable dielectrics such as tantalum or Oscon. (2) Consult SOA curves or contact the factory to determine the appropriate derating. (3) If pin 2 is left open, the PT3320 will operate when input power is applied. (4) See Application Notes at end of section. For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT3320 Series--48V
30 Watt 48V Input Isolated DC-DC Converter
Typical Characteristics
PT3321, 3.3 VDC
(See Note A)
PT3322, 5.0 VDC
(See Note A)
PT3323, 12.0 VDC
(See Note A)
Efficiency vs Output Current
90 90
Efficiency vs Output Current
90
Efficiency vs Output Current
80
80
80
Efficiency (%)
Efficiency (%)
Efficiency (%)
Vin
70
36.0V 48.0V 60.0V 75.0V
Vin
70
36.0V 48.0V 60.0V 75.0V
Vin
70
36.0V 48.0V 60.0V 75.0V
60
60
60
50
50
50
40 0 2 4 6 8
40 0 1 2 3 4 5 6
40 0.0 0.5 1.0 1.5 2.0 2.5
Iout (A)
Iout (A)
Iout (A)
Ripple vs Output Current
40 50
Ripple vs Output Current
160 140 40
Ripple vs Output Current
30
120
Ripple (mV)
Ripple (mV)
Vin
20
36.0V 48.0V 60.0V 75.0V
Ripple (mV)
30
Vin
36.0V 48.0V 60.0V 75.0V
100 80 60 40
Vin
36.0V 48.0V 60.0V 75.0V
20
10 10
20 0 0 2 4 6 8 0 0 1 2 3 4 5 6 0 0.0 0.5 1.0 1.5 2.0 2.5
Iout (A)
Iout (A)
Iout (A)
Power Dissipation vs Output Current
8 7 6 6 5
Power Dissipation vs Output Current
6 5
Power Dissipation vs Output Current
PD (Watts)
4 3 2 1
4
PD (Watts)
36.0V 48.0V 60.0V 75.0V
PD (Watts)
Vin
Vin
36.0V 48.0V 60.0V 75.0V
4 3 2 1 0
Vin
36.0V 48.0V 60.0V 75.0V
2
0 0 2 4 6 8
0 0 1 2 3 4 5 6
0.0
0.5
1.0
1.5
2.0
2.5
Iout (A)
Iout (A)
Iout (A)
Safe Operating Area @Vin=48V (Note B)
90
Safe Operating Area @Vin =48V (Note B)
90
Safe Operating Area @Vin=48V (Note B)
90
Ambient Temperature (C)
Ambient Temperature (C)
70 60 50 40 30 20 0 2 4 6 8
70 60 50 40 30 20 0 1 2 3 4 5 6
Ambient Temperature (C)
80
80
80 70 60 50 40 30 20 0 0.5 1 1.5 2 2.5
Airflow
Nat conv 60LFM 120LFM 200LFM
Airflow
Nat conv 60LFM 120LFM 200LFM
Airflow
Nat conv 60LFM 120LFM 200LFM
Iout (A)
Iout (A)
Iout (A)
Note A: All data listed in the above graphs has been developed from actual products tested at 25C. This data is considered typical data for the DC-DC Converter. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer's maximum rated operating conditions.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes
PT3320/3340/4560/4580 Series
Adjusting the Output Voltage of Power Trends' 30W Isolated DC-DC Converter Series
The factory pre-set output voltage of Power T rends' 30W series of isolated DC-DC converters may be adjusted within a nominal 10% range. This is accomplished with the addition of a single external resistor. For the input voltage range specified in the data sheet, T able 1 gives the allowable adjustment range for each model as Vo (min) and Vo (max). Adjust Up: An increase in the output voltage is obtained by adding a resistor, R2 between pin 18 (Vo adjust), and pin 13 (-Remote Sense). See note 4. Adjust Down: Add a resistor (R1), between pin 18 (Vo adjust) and pin 19 (+Remote Sense). Refer to Figure 1 and T able 2 for both the placement and value of the required resistor, (R1) or R2. Notes: 1. Use only a single 1% resistor in either the (R1) or R2 location. Place the resistor as close to the ISR as possible. 2. Never connect capacitors to Vo adjust. Any capacitance added to the Vo adjust control pin will affect the stability of the ISR. 3. If the remote sense pins are not being used, the resistors (R1) and R2 can be connected to +Vout or -Vout respectively.
Table 1 DC-DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt # AL Case: 24V Bus 48V Bus CU Case: 24V Bus 48V Bus Vo(nom) Vo(min) Vo(max) Vr Ko (V*k) Rs (k)
4. The adjusted output voltage, Va effectively sets the voltage across pins 13 and 19 (Remote Sense). When using the remote sense pins, Vout (measured directly across pins 10- 12, and 14-17) can be significantly higher than Va, and may exceed Vo (max). If Va is adjusted upward of Vo(max), the the minimum input voltage is increased by the same percentage as Vout exceeds Vo(max). The values of (R1) [adjust down], and R2 [adjust up], can also be calculated using the following formulas. (R1) = Ko (Va - Vr) Vr (Vo - Va) Ko (Va - Vo) Vo Va Vr Ko Rs = = = = = - Rs k
R2 Where
=
- Rs
k
Original output voltage Adjusted output voltage Reference voltage (Table 1) Multiplier constant (T able 1) Series resistance (Table 1)
PT3327 PT4585 PT4567 1.8V 1.62V 1.98V 1.225V 69.58 80.6
PT3325
PT3326
PT3341 PT3321 PT4581 PT4561 3.3V 2.95V 3.65V 1.225V 68.89 150.0
PT3342 PT3322 PT4582 PT4562 5.0V 4.5V 5.5V 1.225V 68.71 121.0
PT3343 PT3323 PT4583 PT4563 12.0V 10.8V 13.2V 2.5V 135.9 90.9
PT3344 PT3324 PT4584 PT4564 15.0V 13.5V 16.5V 2.5V 137.5 80.6
PT4565 2.0V 1.8V 2.2V 1.225V 62.47 150.0
PT4566 2.5V 2.25V 2.75V 1.225V 42.33 121.0
Figure 1
2 Inhibit 7, 8, 9 19 Sns(+) 14 - 17
+ V in
+Vin
30W Isolated
-Vin 4, 5, 6 -Vout 10 - 12 Sns(-) 13
+Vout
+ V out
Vo(adj) 18
Cin 1 0 0F 100V (Optional)
(R1) Adj Down
+
R2 Adj Up
Cout 3 3 0F
+
L O A D
-V in
-V out
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes continued
PT3320/3340/4560/4580 Series
Table 2 DC-DC CONVERTER ADJUSTMENT RESISTOR VALUES
Series Pt # AL Case 24V Bus 48V Bus CU Case 24V Bus 48V Bus Current Vo(nom) Va(req'd) 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 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 1230.0k 539.0k 309.0k 194.0k 126.0k 79.6k 46.8k 726.0k 302.0k 161.0k 90.6k 48.3k (127.0)k (183.0)k (261.0)k (377.0)k (572.0)k (961.0)k (2130.0)k 1100.0k 475.0k 266.0k 162.0k (20.7)k (64.7.0)k (138.0)k (285.0)k (726.0)k 1270.0k 575.0k 343.0k (62.5)k (194.0)k (589.0)k
PT3327 PT4585 PT4567 8Adc 1.8V (39.9)k (149.0)k (475)k
PT3325
PT3341 PT3326
PT3342 PT3321 PT4581 PT4561 8Adc 3.3Vdc Va(req'd) 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95 5.0 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5
PT3343 PT3322 PT4582 PT4562 6adc 5.0Vdc V a(req'd) (246.0)k (293.0)k (352.0)k (428.0)k (529.0)k (670.0)k (882.0)k (1230.0)k (1940.0)k 10.8 11.0 11.2 11.4 11.6 11.8 12.0 12.2 12.4 12.6 12.8 13.0 566.0k 337.0k 223.0k 154.0k 108.0k 75.3k 50.8k 31.7k 16.4k 13.5 13.6 13.8 14.0 14.2 14.4 14.6 14.8 15.0 15.2 15.4 15.6 15.8 16.0 16.5 13.2
PT3344 PT3323 PT4583 PT4563 2.5Adc 12.0Vdc (285.0)k (371.0)k (500.0)k (715.0)k (1150.0)k
PT3324 PT4584 PT4564 2.0Adc 15.0Vdc
PT4565 8Adc 2.0Vdc
PT4566 8Adc 2.5Vdc
588.0k 249.0k 136.0k 78.9k 45.0k 22.3k (323.0)k (355.0)k (437.0)k (522.0)k (724.0)k (1010.0)k (1580.0)k
607.0k 263.0k 149.0k 91.3k 56.9k 11.1k
R1 = (Blue)
R2 = Black
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes
PT3320/3340/4560/4580 Series
Using the Inhibit Function on the Power Trends' 30W Isolated DC-DC Converter Series
For applications requiring output voltage on/off control, the Power T rends' 30W isolated series of DC-DC converters incorporate an inhibit function. This function may be used in applications that require battery conservation, power-up/shutdown sequencing, and/or to co-ordinate the power-up of the regulator for active in-rush current control. (See the related application note, AN21). The inhibit function is provided by the Inhibit control, pin2. If pin 2 is left open-circuit, the converter provides a regulated output whenever a valid source voltage4 is applied between +Vin(pins 7-9), and -Vin (pins 4-6). Applying a low-level ground signal2 to pin 2 will disable the regulator output. The inhibit control is also compatible with some logic families. T able 1 provides details of the logic threshold requirements for the inhibit input. Figure 1 shows how either a discrete MOSFET (Q1) or a logic gate (U1a)5, may be referenced to the negative input voltage rail and used with the inhibit control.
Table 1 Inhibit Control Thresholds 2 Parameter min max
Enable (VIH) Disable (VIL) 2.5V -0.3V 15.0V 0.8V
from the input supply is typically reduced to 8mA (16mA maximum). 7. Keep the on/off transition to less than 1ms. This prevents erratic operation of the ISR, whereby the output voltage may drift un-regulated between 0V and the rated output during power-up.
Figure 1
2 Inhibit 7, 8, 9 19 Sns(+) 14 - 17
+ V in
+ C in
+Vin
30W Isolated
-Vin 4, 5, 6 -Vout 10 - 12 Sns(-) 13
+Vout
+ Vo
Vo(adj) 18
+ C out
-V in
Note 2 Q1 BSS138
-V o
Inh
Note 2 Vdd R1 10k U1a Note 2
(or Open Circuit) 5
Notes: 1. The inhibit control logic is similar for all Power Trends' modules, but the flexibility and threshold tolerances will be different. For specific information on this function for other converters, consult the applicable application note. 2. The inhibit control pin uses -Vin (pins 4-6) as its ground reference. All voltages specified are with respect to -Vin. 3. The inhibit control internal circuitry comprises of a high impedance 10A current source. The open-circuit voltage may be as high as 8.3Vdc. 4. These converters incorporate an "Under Voltage Lockout" (UVLO) function. This function automatically inhibits the converter output until there is sufficient input voltage for the converter to produce a regulated output. T able 2 gives the applicable UVLO thresholds.
Table 2 UVLO Thresholds 2/ Series UVLO Threshold
PT3320/4560 PT3340/4580 33 2.0V 15.5 1.5V
Turn-On Time: When the Inhibit pin is left open-circuit, the output of the regulator is automatically enabled when a valid input voltage4 is applied to the input power pins. The converter typically produces a fully regulated output voltage within 30-ms of the application of power, or the release of the inhibit pin with input power applied. The actual turn-on time will vary with the input voltage, output load, and the total amount of capacitance connected to the output Using the circuit of Figure 1, Figure 2 shows the typical output voltage and input current waveforms of a PT3322/PT4562 after Q1 is turned off at time t = 0s. The waveform was measured with a 48Vdc input voltage, and 1-ohm resistive load.
Figure 2
Vin Range
36 - 75V 18 - 60V
Vo (2V / Div)
5. The inhibit pin may be controlled using devices with either an open-collector or differential output. With a bipolar transistor or MOSFET, select a low-leakage part (<1A). A pull-up resistor is not necessary. If a logic gate is used a pull-up resistor may be required to the logic supply voltage, Vdd. This is to ensure that the gate output exceeds VIH(min) (see T able 1). Do not use a pull-up resistor to the +Vin input, or drive the inhibit pin above VIH(max). 6. When the converter output is disabled the current drawn
Iin (0.5A / Div)
0
5
10
15
20
25
30
t (milli - secs)
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
IM PORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, eitherexpress orimplied, is granted underany patent right, copyright, mask work right, orother intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright (c) 2000, Texas Instruments Incorporated

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