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参数资料
| 型号： | PSK1212-7B |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | METAL, CASE K01, MODULE |
| 文件页数： | 17/18页 |
| 文件大小： | 366K |
| 代理商： | PSK1212-7B |
PSS, PSK Extended Data Sheet
Positive Switching Regulator (Rugged)
REV. FEB. 25 2004
Page 8 of 18
Table 5: Inhibit characteristics
Characteristics
Conditions
min typ max
Unit
Vinh
Inhibit input voltage to keep
Vo = on
Vi min - Vi max
–50
+0.8
VDC
regulator output voltage -
Vo = off
TC min - TC max
+2.4
+50
t r
Switch-on time after inhibit command
Vi = Vi nom
150
ms
t f
Switch-off time after inhibit command
RL = Vo nom /Io nom
30
Ii inh
Input current when inhibited
Vi = Vi nom
25
mA
R Control for Output Voltage Adjustment
Note: With open R input,
Vo
≈ Vo nom.
The output voltage
Vo can either be adjusted with an exter-
nal reference voltage (
Vext) or with an external resistor (R1
or
R2). The adjustment range is 0 - Vo max. The minimum dif-
ferential voltage
DVio min between input and output (see:
Electrical Input Data) should be maintained. Undervoltage
lock-out = minimum input voltage.
S+
R
+
4000
Vref
Vext
–
+
S–
06048
S+
R
–
+
4000
Uref
R1
R2
S–
06049
Fig. 9
Voltage adjustment with Vext between R and S–
a)
Vo = 0 - Vo max, using Vext between R and S–:
Vo
Vext
≈ 2.5 V –––––
Vo
≈ Vo nom –––––
Vonom
2.5 V
Fig. 10
Voltage adjustment with external resistor R1 or R2
b)
Vo = 0 - 100% Vo nom, using R1 between R and S–:
4000
Vo
Vo nom R1
R1
≈ –––––––––––
Vo
≈ –––––––––––
Vonom – Vo
R1 + 4000
c)
Vo = Vo nom - Vo max, using R2 between R and S+:
4000
Vo (Vo nom – 2.5 V)
R2
≈ ––––––––––––––––––––––––
2.5 V (
Vo – Vo nom)
Vo nom 2.5 V R2
Vo
≈ ––––––––––––––––––––––––––––––––
2.5 V (
R2 + 4000
) – Vo nom 4000
Caution: To prevent damage
Vext should not exceed 20 V,
nor be negative, and
R2 should never be less than 47 k
.
Table 6: Maximum adjustable output voltage
Characteristics
Conditions
PSS 129
PSS 249
PSS 369
PSS 489
PSK 1212
PSK 2412
PSK 3612
PSK 4812
min typ max
Unit
Vo max Maximum adjustable
Vi nom, Io nom
16.0
26.0
42.5
52.8
V
output at R control input
CS
Current Sharing
For parallel operation of several modules, interconnecting
all CS pins ensures that the output currents are evenly dis-
tributed. This feature improves transient load performance
and increases system reliability. All paralleled units should
be
supplied
by
equal
input
voltage
(
Vi)
and
interconnecting leads should have equal length and cross
section to ensure equal voltage drop.
Test Sockets
Test sockets (pin
= 2 mm) for measuring the output volt-
age
Vo internally at the cxonnector terminals, are located at
the front side of the module. The test sockets are protected
by a series resistor.
LED Output Voltage Indicator
A green output indicator LED shines when the output volt-
age is present.
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