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參數(shù)資料
| 型號(hào)： | SI9123 |
| 廠商： | Vishay Intertechnology,Inc. |
| 元件分類(lèi)： | DC/DC變換器 |
| 英文描述： | 500-kHz Half-Bridge DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
| 中文描述： | 500千赫半橋型DC - DC與集成的次級(jí)同步整流控制轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 181K |
| 代理商： | SI9123 |
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Si9123
Vishay Siliconix
New Product
Document Number: 72098
S-03639—Rev. B, 20-Mar-03
www.vishay.com
11
Hiccup Operation
Current limiting is achieved by monitoring the differential
voltage between CS1 and CS2 pins which are connected
across a primary low-side sense resistor. Once the differential
voltage exceeds the 150-mV trigger point, Hiccup operation is
started. The SS pin is pulled to ground and switching stops until
the SS
pin
charges up to 2 V
be
whereupon a duty cycle limited
soft-start is initiated. The upper and lower switching points of
the current limit have 50 mV of hysteresis.
V
INEXT
Voltage Monitor – V
INDET
The Si9123 provides a means of sensing the voltage on
V
INEXT
to control the operating mode and provides the
feed-forward control voltage to the PWM controller. This is
achieved by choosing an appropriate resistive tap between
V
INEXT
and ground.
When the V
INDET
voltage is greater than 720 mV but less than
V
REF
and V
CC
is greater than V
UVLO
, all internal circuitry is
enabled, but switching is stopped.
When the applied voltage is greater than V
REF
and V
CC
is
greater than V
UVLO
, the output drivers are activated as normal.
If the voltage applied to the V
INDET
pin is greater than V
CC
-0.3 V, the high-side driver, D
H
, will stop switching until the
voltage drops below V
CC
-0.3 V. If continuous switching is
desired under maximum V
INEXT
conditions, the resistive tap on
the V
INEXT
divider must be set to accommodate the normal
V
CC
operating voltage. Alternatively, a zener clamp diode from
V
INDET
to GND may also be used.
V
INDET
also provides the input to the voltage feed-forward
function by adjusting the amplitude of the PWM ramp to the
PWM comparator.
Shutdown Mode
If V
INDET
pin is forced below 470 mV the device will enter
SHUTDOWN mode. This powers down all unnecessary
functions of the controller, ensures that the primary switches
are off and results in a low level current demand of 140 A from
the V
INEXT
CC
supplies.
TYPICAL CHARACTERISTICS
7.5
8.0
8.5
9.0
9.5
10.0
-50
-25
0
25
50
75
100
125
150
7.90
7.95
8.00
8.05
8.10
8.15
8.20
-50
-25
0
25
50
75
100
125
150
V
REG
vs. Temperature, V
IN
= 48 V
Temperature ( C)
(
V
R
V
INDET
V
REF
T
C
= -11 mV/C
V
SS
vs. Temperature, V
CC
= 12 V
Temperature ( C)
(
V
S
T
C
= +1.25 mV/C
V
INDET
V
REF
15
17
19
21
23
25
-50
-25
0
25
50
75
100
125
I
SS1
vs. V
CC
vs. Temperature
Temperature ( C)
V
CC
= 13 V
80
90
100
110
120
130
140
-50
-25
0
25
50
75
100
125
I
SS2
vs. V
CC
vs. Temperature
Temperature ( C)
V
CC
= 10 V
V
CC
= 12 V
V
CC
= 13 V
V
CC
= 10 V
V
CC
= 12 V
(
I
S
(
I
S
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