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PTN78000H Datasheet(PDF) 3 Page - Texas Instruments

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Part # PTN78000H
Description  1.5-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PTN78000H Datasheet(HTML) 3 Page - Texas Instruments

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ELECTRICAL CHARACTERISTICS
PTN78000W, PTN78000H
www.ti.com...................................................................................................................................... SLTS230C – NOVEMBER 2004 – REVISED SEPTEMBER 2008
operating at 25°C free-air temperature, VI = 20 V, VO = 5 V, IO = IO (max), CI = 2.2 µF, CO = 100 µF (unless otherwise noted)
PTN78000W
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
IO
Output current
TA = 85°C, natural convection airflow
0
1.5
A
VI
Input voltage range
Over IO range
7 (1)
36 (2)
V
Set-point voltage tolerance
TA = 25°C
±2% (3)
Temperature variation
–40°C to +85°C
±0.5%
Line regulation
Over VI range
±10
mV
VO
Load regulation
Over IO range
±10
mV
Includes set point, line, load
Total output voltage variation
±3% (3)
–40°C < TA < 85°C
VI < 12 V
2.5
VI – 2
12 V
≤ VI ≤ 15.1 V
2.5
VI – 2.5
VO Adj
Output voltage adjust range
V
15.1 V < VI ≤ 25 V
2.5
12.6
VI > 25 V
0.1 x VI
12.6
VI = 24 V, RSET = 732 Ω, VO = 12 V
91%
η
Efficiency
VI = 15 V, RSET = 21 kΩ, VO = 5 V
86%
VI = 15 V, RSET = 78.7 kΩ, VO = 3.3 V
82%
Output voltage ripple
20 MHz bandwith
1% VO
V(PP)
IO (LIM)
Current limit threshold
ΔVO = –50 mV
3.2
A
1 A/µs load step from 50% to 100% IOmax
Transient response
Recovery time
100
µs
VO over/undershoot
2.5
%VO
VI increasing
5.5
UVLO
Undervoltage lockout
V
VI decreasing
5.2
Input high voltage (VIH)
1
Open (4)
V
Inhibit control (pin 3)
Input low voltage (VIL)
–0.1
0.3
Input low current (IIL)
0.25
mA
II (STBY)
Input standby current
Pin 3 connected to GND
17
mA
FS
Switching frequency
Over VI and IO ranges
440
550
660
kHz
CI
External input capacitance
Ceramic
2.2 (5)
µF
Nonceramic
100 (6)
µF
CO
External output capacitance
Ceramic
200
Equiv. series resistance (nonceramic)
10 (7)
m
Per Telcordia SR-332, 50% stress,
MTBF
Calculated reliability
8.9
106 Hr
TA = 40°C, ground benign
(1)
For output voltages less than 10 V, the minimum input voltage is 7 V or (VO + 2) V, whichever is greater. For output voltages of 10 V
and higher, the minimum input voltage is (VO + 2.5) V. See the Application Information section for further guidance.
(2)
For output voltages less than 3.6 V, the maximum input voltage is 10 × VO . See the Application Information section for further guidance.
(3)
The set-point voltage tolerance is affected by the tolerance and stability of RSET. The stated limit is unconditionally met if RSET has a
tolerance of 1% with with 100 ppm/°C or better temperature stability.
(4)
This control pin has an internal pullup, and if left open circuit, the module operates when input power is applied. The open-circuit voltage
is typically 1.5 V. A smal,l low-leakage (< 100 nA) MOSFET is recommended for control. See the Application Information section for
further guidance.
(5)
An external 2.2-µF ceramic capacitor is required across the input (VI and GND) for proper operation. Locate the capacitor close to the
module.
(6)
100 µF of output capacitance is required for proper operation. See the Application Information section for further guidance.
(7)
This is the typical ESR for all the electrolytic (nonceramic) capacitance. Use 17 m
Ω as the minimum when using maximum ESR values
to calculate.
Copyright © 2004–2008, Texas Instruments Incorporated
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