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LM34925 Scheda tecnica(PDF) 4 Page - Texas Instruments

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Il numero della parte LM34925
Spiegazioni elettronici  Integrated Secondary Side Bias Regulator for Isolated DC-DC Converters
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM34925
SNVS846E – JUNE 2012 – REVISED DECEMBER 2013
www.ti.com
Electrical Characteristics
Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction
Temperature range. VIN = 48 V, unless otherwise stated. See
(1).
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VCC Supply
VCC Reg
VCC Regulator Output
VIN = 48 V, ICC = 20 mA
6.25
7.6
8.55
V
VCC Current Limit
VIN = 48 V
(2)
26
mA
VCC UVLO Threshold (VCC
4.15
4.5
4.9
V
increasing)
VCC UVLO Hysteresis
300
mV
VCC Drop Out Voltage
VIN = 8 V, ICC = 20 mA
2.3
V
IIN Operating Current
Non-Switching, FB = 3 V
1.75
mA
IIN Shutdown Current
UVLO = 0 V
50
225
µA
Under-Voltage Sensing Function
UV Threshold
UV Rising
1.19
1.225
1.26
V
UV Hysteresis Input Current
UV = 2.5 V
-10
-20
-29
µA
Remote Shutdown Threshold
Voltage at UVLO Falling
0.32
0.66
V
Remote Shutdown Hysteresis
110
mV
Regulation and Over-Voltage Comparators
FB Regulation Level
Internal Reference Trip Point for
1.2
1.225
1.25
V
Switch ON
FB Overvoltage Threshold
Trip Point for Switch OFF
1.62
V
FB Bias Current
60
nA
Switch Characteristics
Buck Switch RDS(ON)
ITEST = 100 mA, BST-SW = 7 V
0.8
1.8
Synchronous RDS(ON)
ITEST = 200 mA
0.45
1
Gate Drive UVLO
VBST − VSW Rising
2.4
3
3.6
V
Gate Drive UVLO Hysteresis
260
mV
Minimum Off-Time
Minimum Off-Timer
FB = 0 V
144
ns
On Time Generator
TON Test 1
VIN = 32 V, RON = 100 k
270
350
460
ns
TON Test 2
VIN = 48 V, RON = 100 k
188
250
336
ns
TON Test 3
VIN = 75 V, RON = 250 k
250
370
500
ns
TON Test 4
VIN = 10 V, RON = 250 k
1880
3200
4425
ns
Current Limit
Current Limit Threshold
150
270
370
mA
Current Limit Response Time
Time to Switch Off
150
ns
OFF-Time Generator (Test 1)
FB = 0.1 V, VIN = 48 V
12
µs
OFF-Time Generator (Test 2)
FB = 1.0 V, VIN = 48 V
2.5
µs
(1)
All limits are verified by design. All electrical characteristics having room temperature limits are tested during production at TA = 25°C. All
hot and cold limits are verified by correlating the electrical characteristics to process and temperature variations and applying statistical
process control.
(2)
VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading.
4
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