For technical support and more information, see inside back cover or visit www.ti.com
Standard Application
Features
•18V to 36V Input Voltage Range
•Programmable Output Voltage
Range: 1.3V to 3.5V
•-40° to +100°C Operating Temp
•1500 VDC Isolation
•89% Efficiency
•Remote On/Off
•Differential Remote Sense
•60A Output with PT4495
SLTS144A
(Revised 5/28/2002)
Description
The PT4452 Excalibur™ DC/DC
converter module combines state-of-the-
art power conversion technology with
un-paralleled flexibility. Incorporating
high efficiency and ultra-fast transient
response, these modules provide up to
30A of output current over the program-
mable voltage range of 1.3V to 3.5V.
This represents a full 100W output at
3.3V.
The modules include a number of
inbuilt features to facilitate system
integration. These include output over-
current shutdown (with auto reset),
over-temperature protection, and an
inhibit on/off control. A differential
remote sense is also provided to com-
pensate for voltage drop between the
converter and load.
For additional output current, one
PT4452 may be operated with up to two
PT4495 compatible booster modules.
Each PT4495 adds an additional 30A of
output current capability.
•Over-Current Protection
(Shutdown with Auto-Reset)
•Over-Temperature Protection
•Over-Voltage Protection
•Space-Saving Package
•Solderable Copper Case
•Safety Approvals:
UL 60950
CSA 22.2 950
VDE EN60950 Pending
L
O
A
D
PT4452
+V
sns
+V
out
-V
out
-V
sns
7
8-13
14-19
202522 2423
VID0 - VID4
+V
in
–V
in
1
2
3
Inhibit
C
1
+
PROGRAMMING PINS
+V
OUT
+V
IN
–V
IN
–V
OUT
C
o
+
21
•C
o = Optional 330µF electrolytic capacitor
•C
1 = Optional 33µF, 100V electrolytic capacitor
•C
2 = Optional 1µF, 100V ceramic capacitor
• Programming pins, VID0–VID4, are shown
configured for Vo =3.3V
• For normal operation, pin 3 (Inhibit) must be
connected to –Vin.
Ordering Information
PT4452o = 1.3 to 3.5 Volts
PT4495o = 30-A Booster
PT Series Suffix (PT1234x)
Case/Pin Order Package
Configuration Suffix Code
Vertical N(EKD)
Horizontal A(EKA)
SMD C(EKC)
(Reference the applicable package code draw-
ing for the dimensions and PC board layout)
Pin-Out Information
Pin Function
1+V
in
2–V
in
3 Inhibit
4V
r †
5V
a †
6 No Connect
7 (+)Remote Sense
8+V
out
9+V
out
10 +Vout
11 +Vout
12 +Vout
13 +Vout
Pin Function
14 –Vout
15 –Vout
16 –Vout
17 –Vout
18 –Vout
19 –Vout
20 (–)Remote Sense
21 VID0
22 VID1
23 VID2
24 VID3
25 VID4
26 DRV †
PT4452—24V
100-W 30-A Programmable
Isolated DC/ DC Converter
†Pins 4, 5, & 26 are used for booster applications. For
stand-alone operation, leave open circuit.
For technical support and more information, see inside back cover or visit www.ti.com
PT4452—24V
100-W 30-A Programmable
Isolated DC/ DC Converter
Programming Information
VID4=1 VID4=0
VID3 VID2 VID1 VID0 Vout Vout
1 1 1 1 2.0V 1.30V
1 1 1 0 2.1V 1.35V
1 1 0 1 2.2V 1.40V
1 1 0 0 2.3V 1.45V
1 0 1 1 2.4V 1.50V
1 0 1 0 2.5V 1.55V
1 0 0 1 2.6V 1.60V
1 0 0 0 2.7V 1.65V
0 1 1 1 2.8V 1.70V
0 1 1 0 2.9V 1.75V
0 1 0 1 3.0V 1.80V
0 1 0 0 3.1V 1.85V
0 0 1 1 3.2V 1.90V
0 0 1 0 3.3V 1.95V
0 0 0 1 3.4V 2.00V
0 0 0 0 3.5V 2.05V
Logic 0 = Connect to (–)Remote Sense, pin 20
Logic 1 = Open circuit (no pull-up resistors)
Specifications (Unless otherwise stated, Ta =25°C, Vin =24V, Vo =3.3V, Co =0µF, and Io =Iomax)
PT4452
Characteristic Symbol Conditions Min Typ Max Units
Output Current IoOver Vin range 0 — 30 A
Input Voltage Range Vin Over Io Range 18 24 36 VDC
Set Point Voltage Tolerance Vo tol — ±1 ±1.5 %Vo
Temperature Variation Regtemp –40° ≤Tc ≤ +100°C, Io =0 — ±0.5 — %Vo
Line Regulation Regline Over Vin range — ±0.1 ±1 %Vo
Load Regulation Regload Over Io range — ±0.2 ±1 %Vo
Total Output Voltage Variation ∆Votot Includes set-point, line, load, —±2±3%V
o
–40° ≤Tc ≤ +100°C
Efficiency ηIo =15A Vo =3.3V — 89 —
Vo =2.5V — 87 — %
Vo =1.5V — 81 —
Vo Ripple (pk-pk) Vr20MHz bandwidth Vo >2.0V — 55 75 mVpp
Vo ≤2.0V — 45 55
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — N/A — µs
∆Vtr Vo over/undershoot — 1 — %Vo
1A/µs load step, 50% to 100% Iomax — 75 — µs
Vo over/undershoot — ±5 — %Vo
Current Limit Threshold Ilim thld Vin =18V, shutdown with auto-restart — 35 — A
Current Share Tolerance Ishr tol with PT4495 booster — ±10 — %
Over-Voltage Protection OVP Shutdown and latch off — 125 — %Vo
Switching Frequency ƒsOver Vin range 270 300 350 kHz
Under-Voltage Lockout UVLO — 17 — V
Inhibit (Pin 3) Referenced to –Vin (pin 2)
Input High Voltage VIH 2.5 — Open (1) V
Input Low Voltage VIL –0.5 — +0.8
Input Low Current IIL — –0.2 — mA
Standby Input Current Iin standby pins 3 & 2 connected — 4 10 mA
Internal Input Capacitance Cin —3 —µF
External Output Capacitance Cout Between +Vo and –Vo0 — 10,000 µF
Isolation Voltage Input–output/input–case 1500 — — V
Capacitance Input to output — 1100 — pF
Resistance Input to output 10 — — MΩ
Operating Temperature Range T
cCase temperature, over Vin range -40 — +115 (2) °C
Over-Temperature Shutdown OTP Case temperature, auto reset — 120 — °C
Storage Temperature Ts— -40 — +125 °C
Reliability MTBF Per Bellcore TR-332 1.4 — — 106 Hrs
50% stress, Ta =40°C, ground benign
Mechanical Shock — Per Mil-Std-883D, method 2002.3, — 500 — G’s
1mS, half-sine, mounted to a fixture
Mechanical Vibration — Mil-Std-883D, Method 2007.2 Horizontal — 20 (3) —G’s
20-2000Hz, pcb mounted
Weight — — — 90 — grams
Flammability — Materials meet UL 94V-0
Notes: (1) The Inhibit (pin 3) has an internal pull-up, which if left open circuit allows the converter to operate when input power is applied. The open-circuit is
limited to 6.5V. Refer to the application notes for interface considerations.
(2) See Safe Operating Area curves or contact the factory for the appropriate derating.
(3) The case pins on through-hole pin configuration (suffix 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
Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures
Efficiency vs Output Current
Ripple vs Output Current
Power Dissipation vs Output Current
Typical Characteristics
PT4452—24V
100-W 30-A Programmable
Isolated DC/ DC Converter
Stand Alone, No Heatsink
Safe Operating Area, Vin =24V (See Note B)PT4452 Performance Characteristics (See Note A)
0
4
8
12
16
20
0 5 10 15 20 25 30
Iout
(
A
)
Pd - Watts
18.0V
24.0V
36.0V
VIN
20
30
40
50
60
70
80
90
0 5 10 15 20 25 30
Iout
(
A
)
Ambient Temperature (°C)
500LFM
400LFM
300LFM
200LFM
100LFM
Nat conv
Airflow
50
60
70
80
90
100
0 5 10 15 20 25 30
Iout
(
A
)
Efficiency - %
3.3V
2.5V
1.5V
VOUT
0
20
40
60
80
100
0 5 10 15 20 25 30
Iout
(
A
)
Ripple - mV
3.3V
2.5V
1.5V
VOUT
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