SI9122 Datasheet, PDF (4/17 Pages) Vishay Siliconix – 500-kHz Half-Bridge DC-DC Converter With Integrated Secondary Synchronous Rectification Drivers

Si9122
Vishay Siliconix
SPECIFICATIONS^a
Parameter
Current Sense Amplifier
Input amplifier Offset Voltage
CL_CONT Current
Symbol
V_OS
I_{CL_CONT}
Lower Current Limit Threshold
Upper Current Limit Threshold
Hysteresis
CL_CONT Clamp Level
PWM Operation
Duty Cycle^e
V_TLCL
V_THCL
C_{L_CONT(min)}
D_MAX
D_MIN
Pre-Regulator
Input Voltage
Input Leakage Current
Regulator Bias Current
Regulator_Comp
Pre-Regulator Drive Capacility
+V_IN
I_LKG
I_REG1
I_REG2
I_SOURCE
I_SINK
I_START
V_CC Pre-Regulator Turn Off
Threshold Voltage
V_REG1
V_REG2
Undervoltage Lockout
V_UVLO
V_UVLO Hysteresis^g
Soft-Start
V_UVLOHYS
Soft-Start Current Output
Soft-Start Completion Voltage
Shutdown
I_SS
V_{SS_COMP}
V_INDET Shutdown FN
V_SD
V_INDET Hysteresis
V_INDET Input Threshold Voltages
V_INDET − V_IN Under Voltage
V_UV
V_INDET Hysteresis
Over Temperature Protection
Activating Temperature
De-Activating Temperature
Converter Supply Current (V_CC)
Shutdown
I_CC1
Switching Disabled
I_CC2
Switching w/o Load
I_CC3
Switching with C_LOAD
I_CC4
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4
Test Conditions
Unless Otherwise Specified
f_NOM = 500 kHz, V_IN = 72 V
V_INDET = 7.2 V; 10 V v V_CC v 13.2 V
dV_CS = 0
dV_CS = 100 mV
dV_CS = 170 mV
I_PD = I_PU − I_{CL_CONT} = 0
See Figure 6
I_PD u 2 mA
I_PU t 500 mA
I_PU = 500 mA
f_OSC = 500 kHz
V_EP= 0 V
V_EP= 1.75 V
V_CS2 − V_CS1 u 150 mV
I_IN = 10 mA
V_IN = 72 V, V_CC u V_REG
V_IN = 72 V, V_INDET t V_SD
V_IN = 72 V, V_INDET u V_REF
V_CC = 12 V
V_CC t V_REG
V_INDET u V_REF
V_INDET = 0 V
T_A = 25_C
V_CC Rising
T_A = 25_C
Start-Up Condition
Normal Operation
V_INDET Rising
V_INDET
V_INDET Rising
V_INDET
T_J Increasing
T_J Decreasing
Shutdown, V_INDET = 0 V
V_INDET t V_REF
V_INDET u V_REF, f_NOM = 500 kHz
V_CC = 12 V, C_DH = C_DL = 3 nF
C_SRH = C_SRL = 0.3 nF
Min^b
Limits
−40 to 85_C
Typ^c
Max^b
Unit
"5
mV
120
0
mA
u2
mA
100
150
mV
−50
0.6
1.5
V
90
92
95
t15
%
3
72
V
10
86
200
mA
8
14
mA
−29
−19
−9
50
82
110
mA
20
mA
7.4
9.1
10.4
8.5
9.1
9.7
9.2
7.15
8.8
9.8
V
8.1
8.8
9.3
0.5
12
20
28
mA
7.35
8.05
8.85
V
350
550
720
mV
200
3.13
3.3
3.46
V
0.3
160
_C
130
50
350
mA
4
8
12
5
10
14
mA
21
Document Number: 71815
S-41944—Rev. F, 18-Oct-04