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參數(shù)資料
| 型號： | PTN78020AAS |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 1237K |
| 代理商： | PTN78020AAS |
www.ti.com
ELECTRICAL CHARACTERISTICS
PTN78020A
SLTS244A – APRIL 2005 – REVISED MAY 2005
operating at 25°C free-air temperature, V
I = 20 V, VO = –5 V, IO = IO (max), CI = 100 F and 4x 4.7 F, CO = 100 F (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VO = -3 V
0.1
4 (1)
VO = -5 V
0.1
4 (1)
TA = 25°C, natural convec-
IO
Output current
A
tion airflow
VO = -12 V
0.1
2.1 (1)
VO = -15 V
0.1
1.67 (1)
VO = -3 V
9
29 (2)
VO = -5 V
9
27 (2)
VI
Input voltage range
Over IO range
V
VO = -12 V
9
20 (2)
VO = -15 V
9
17 (2)
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 < TA < 85°C
VO (adj)
Output voltage adjust range
9 V
≤ V
I ≤ (32 – |VO|) V
-15
- 3
V
VI = 12 V, RSET = 100 , VO = –15 V
87%
VI = 12 V, RSET = 2 k, VO = –12 V
86%
η
Efficiency
VI = 20 V, RSET = 28.7 k, VO = –5 V
82%
VI = 24 V, RSET = 221 k, VO = –3.3 V
77%
Output voltage ripple
20-MHz bandwidth
1% VO
V(PP)
IO (LIM)
Current limit threshold
V
O = –50 mV
8.5
A
1 A/s load step from 50% to 100%
IOmax
Transient response
Recovery time
200
s
VO over/undershoot
5
%VO
FS
Switching frequency
Over VI and IO ranges
440
550
660
kHz
UVLO
Undervoltage lockout
VI increasing
5.5
V
Ceramic
18.8 (4)
CI
External input capacitance
F
Nonceramic
100 (4)
Ceramic
200
F
CO
External output capacitance
Nonceramic
100 (5)
2,000
Equivalent series resistance (nonceramic)
10 (6)
m
Per Telcordia SR-332, 50% stress,
MTBF
Calculated reliability
5.6
106 Hrs
TA = 40°C, ground benign
(1)
The maximum output current is 4 A, or a maximum output power of 25 W, whichever is less.
(2)
The maximum input voltage is limited and defined to be (32 – |VO|) volts.
(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 100 ppm/°C or better temperature stability.
(4)
A minimum 100-F electrolytic and four 4.7-F ceramic capacitors are required across the input (VI and GND) for proper operation.
Locate the ceramic capacitors close to the module.
(5)
(6)
This is the typical ESR for all the electrolytic (nonceramic) capacitance. Use 17 m
as the minimum when using max-ESR values to
calculate.
3
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