参数资料
| 型号： | PSB5A4-7IR |
| 厂商： | Power-One |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | SWITCHING REGULATOR 20.4W 5.1V |
| 标准包装： | 1 |
| 系列： | * |
PSB Series Data Sheet
?
Auxiliary Functions
i Inhibit (Remote On / Off)
The inhibit input allows the switching regulator output to be
disabled via a control signal. In systems with several
I inh [mA]
Positive Switching Regulators
converters, this feature can be used, for example, to control the
activation sequence of the converters by a logic signal (TTL, C-
MOS, etc.). An output voltage overshoot will not occur, when
switching on or off.
Note: With open i-input, the output is enabled.
R Control (Output Voltage Adjust)
Note: With open R input, V o ≈ V o nom .
5
4
3
06034a
The output voltage V o can either be adjusted with an external
voltage source ( V ext ) or with an external resistor ( R 1 or R 2 ). The
adjustment range is 0 – 108% of V o nom . The minimum
differential voltage ? V io min between input and output (see
Electrical Input Data ) should be maintained.
2
Output on
Output off
a) V o = 0 – V o max , using V ext between pins R and G:
V ext ≈ 2.5 V ? –––––
V o ≈ V o nom ? –––––
1
0
–40
–20
0
20
40
V
V inh
V o V ext
V o nom 2.5 V
Caution: To prevent damage, V ext should not exceed 20 V, nor be
negative.
Fig. 7
b) V o = 0 to V o nom , using R ext1 between pins R and G:
R ext1 ≈ –––––––––––
V o ≈ –-–––––––––––
Typical inhibit current I inh versus inhibit voltage V inh
06009a
4000 ? ? V o
V o nom – V o
V o nom ? R ext1
R ext1 + 4000 ?
R ext2 ≈ ––––––––––––––––––––––––––––––
Vi+
Vo+
i
I inh
V inh
c) V o = V o nom to V o max , using R ext2 between pins R and G:
4000 ? ? V o ? ( V o nom – 2.5 V)
2.5 V ? ( V o – V o nom)
2.5 V ? ( R ext2 + 4000 ? ) – V o nom ? 4000 ?
Gi–
Go–
V o ≈
V o nom ? 2.5 V ? R ext2
––––––––––––––––––––––––––––––––––––––––
Fig. 8
Definition of I inh and V inh
Caution: To prevent damage, R ext2 should never be less than
47 k ? .
V o / V o nom
1
06001
Vi+
JM073
Vo+
0.1
0
Inhibit
1
t r
t f
t
V ref = 2.5 V
+
4 k ?
Control
logic
R
G
R ext 2
R ext1
+
–
V ext
0
t
Gi–
Go–
Fig. 9
Output response as a function of inhibit signal
Fig. 10
Voltage adjustment via R-input
Table 4: Inhibit characteristics
Characteristics
Conditions
min typ max Unit
LED Output Voltage Indicator
V inh Inhibit input voltage V o = on V i min – V i max
–50
+0.8
V
A yellow LED indicator is illuminated, when the output
V o = off
T C min – T C max
+2.4
+50
voltage is higher than approx. 3 V (not for -2 models).
t r
t f
Switch-on time
Switch-off time
V i = V i nom
R L = V o nom / I o nom
130
25
ms
I i inh Input current when inhibited V i = V i nom
25
mA
BCD20026-G Rev AA, 18-May-2011
Page 10 of 15
www.power-one.com
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