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SI9124 Datasheet(Fiches technique) 11 Page - Vishay Siliconix

Numéro de pièce SI9124
Description  500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control
Télécharger  16 Pages
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Fabricant  VISHAY [Vishay Siliconix]
Site Internet  http://www.vishay.com
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 11 page
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Si9124
Vishay Siliconix
New Product
Document Number: 72099
S-03638—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 sense resistor. Once the differential voltage
exceeds the 150-mV trigger point, Hiccup operation is started.
The soft-start voltage on the SS pin is pulled to ground and
switching stops until the SS pin charges up to 2 Vbe whereupon
a duty cycle limited soft start is initiated. The upper and lower
switching points of the current limit have 50 mV of hysteresis.
VINEXT Voltage Monitor – VINDET
The Si9124 provides a means of sensing the voltage on
VINEXT 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
VINEXT and ground.
When the VINDET voltage is greater than 720 mV but less than
VREF and VCC is greater than VUVLO, all internal circuitry is
enabled, but switching is stopped.
VINDET 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 VINDET 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 150
mA from
the VINEXT or VCC 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
VREG vs. Temperature, VIN = 48 V
Temperature (
_C)
VINDET u VREF
TC = - 11 mV/C
VSS vs. Temperature, VCC = 12 V
Temperature (
_C)
TC = +1.25 mV/C
VINDET u VREF
15
17
19
21
23
25
- 50
- 25
0
25
50
75
100
125
ISS1 vs. VCC vs. Temperature
Temperature (
_C)
VCC = 13 V
80
90
100
110
120
130
140
- 50
- 25
0
25
50
75
100
125
ISS2 vs. VCC vs. Temperature
Temperature (
_C)
VCC = 10 V
VCC = 12 V
VCC = 13 V
VCC = 10 V
VCC = 12 V




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