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SI9122A Datasheet(Fiches technique) 4 Page - Vishay Siliconix

Numéro de pièce SI9122A
Description  500-kHz Half-Bridge DC/DC Controller With Integrated Secondary Synchronous Rectification Drivers
Télécharger  15 Pages
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Fabricant  VISHAY [Vishay Siliconix]
Site Internet  http://www.vishay.com
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Si9122A
Vishay Siliconix
www.vishay.com
4
Document Number: 73492
S–51921—Rev. A, 12-Sep-05
SPECIFICATIONSa
Limits
–40 to 85
_C
Test Conditions
Unless Otherwise Specified
fNOM = 500 kHz, VIN = 75 V
VINDET = 7.5 V; 10.5 V v VCC v 13.2 V
Parameter
Unit
Maxb
Typc
Minb
Test Conditions
Unless Otherwise Specified
fNOM = 500 kHz, VIN = 75 V
VINDET = 7.5 V; 10.5 V v VCC v 13.2 V
Symbol
Current Sense Amplifier
dVCS = 0
120
mA
CL_CONT Current
ICL_CONT
dVCS = 100 mV
0
mA
CL_CONT Current
ICL_CONT
dVCS = 170 mV
u2
mA
Lower Current Limit Threshold
VTLCL
IPD = IPU – ICL_CONT = 0
See Figure 6
100
Upper Current Limit Threshold
VTHCL
IPD u 2 mA
150
mV
Hysteresis
IPU t 500 mA
–50
CL_CONT Clamp Level
CL_CONT(min)
IPU = 500 mA
0.6
1.5
V
PWM Operation
DMAX
fOSC = 500 kHz
VEP= 0 V
90
92
95
Duty Cyclee
DMIN
fOSC = 500 kHz
VEP= 1.75 V
t15
%
yy
DMIN
VCS2 – VCS1 u 150 mV
3
Pre-Regulator
Input Voltage
+VIN
IIN = 10 mA
28
75
V
Input Leakage Current
ILKG
VIN = 75 V, VCC u VREG
10
mA
Regulator Bias Current
IREG1
VIN = 75 V, VINDET t VSD
86
200
mA
Regulator Bias Current
IREG2
VIN = 75 V, VINDET u VREF
8
14
mA
Regulator Comp
ISOURCE
VCC =12V
–29
–19
–9
mA
Regulator_Comp
ISINK
VCC = 12 V
50
82
110
mA
Pre-Regulator Drive Capacility
ISTART
VCC t VREG
20
mA
V
PR
l t
T
Off
VREG1
VINDET u VREF
7.4
9.1
10.4
VCC Pre-Regulator Turn Off
Threshold Voltage
VREG1
VINDET u VREF
TA = 25_C
8.5
9.1
9.7
Threshold Voltage
VREG2
VINDET = 0 V
9.2
V
Undervoltage Lockout
VUVLO
VCC Rising
7.15
8.8
9.8
V
Undervoltage Lockout
VUVLO
VCC Rising
TA = 25_C
8.1
8.8
9.3
VUVLO Hysteresisg
VUVLOHYS
0.5
Soft-Start
Soft-Start Current Output
ISS
Start-Up Condition
12
20
28
mA
Soft-Start Completion Voltage
VSS_COMP
Normal Operation
7.35
8.05
8.85
V
Shutdown
VINDET Shutdown
VSD
VINDET Rising
350
550
720
mV
VSD Hysteresis
VINDET
200
mV
VINDET Input Threshold Voltages
VINDET – VIN Under Voltage
VUV
VINDET Rising
3.13
3.3
3.46
V
VUW Hysteresis
VINDET
0.3
V
Over Temperature Protection
Activating Temperature
TJ Increasing
160
_C
De-Activating Temperature
TJ Decreasing
130
_C
Converter Supply Current (VCC)
Shutdown
ICC1
Shutdown, VINDET = 0 V
50
350
mA
Switching Disabled
ICC2
VINDET t VREF
4
8
12
Switching w/o Load
ICC3
VINDET u VREF, fNOM = 500 kHz
5
10
15
mA
Switching with CLOAD
ICC4
VCC = 12 V, CDH = CDL = 3 nF
CSRH = CSRL = 0.3 nF
21
mA




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