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SM74304 Arkusz danych(PDF) 4 Page - Texas Instruments

Numer części SM74304
Szczegółowy opis  SM74304 High Voltage (80V) Step Down Switching Regulator
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SM74304
SNVS720A – OCTOBER 2011 – REVISED APRIL 2013
www.ti.com
Electrical Characteristics (continued)
Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction
Temperature range. VIN = 48V, unless otherwise stated
(1).
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Switch Characteristics
Buck Switch Rds(on)
ITEST = 200mA,
0.74
1.34
VBST
−VSW = 6.3V(3)
Gate Drive UVLO (VBST – VSW)
Rising
3.4
4.5
5.5
V
Gate Drive UVLO Hysteresis
400
mV
Breakdown Voltage
TJ = 25°C
80
V
VIN to Ground
TJ = -40°C to +125°C
76
Breakdown Voltage
TJ = 25°C
80
V
BST to VCC
TJ = -40°C to +125°C
76
Current Limit
Current Limit Threshold
535
725
900
mA
Current Limit Response Time
Iswitch Overdrive = 0.1A Time to
225
ns
Switch Off
OFF time generator (test 1)
FB=0V, RCL = 100K
17
µs
OFF time generator (test 2)
FB=2.3V, RCL = 100K
2.65
µs
On Time Generator
TON -1
Vin = 10V
2.15
2.77
3.5
µs
Ron = 200K
TON -2
Vin = 75V
290
390
490
ns
Ron = 200K
Remote Shutdown Threshold
Rising
0.45
0.7
1.1
V
Remote Shutdown Hysteresis
40
mV
Minimum Off Time
Minimum Off Timer
FB = 0V
300
ns
Regulation and OV Comparators
FB Reference Threshold
Internal reference
2.445
2.5
2.550
V
Trip point for switch ON
FB Over-Voltage Threshold
Trip point for switch OFF
2.875
V
FB Bias Current
100
nA
Thermal Shutdown
Tsd
Thermal Shutdown Temp.
165
°C
Thermal Shutdown Hysteresis
25
°C
Thermal Resistance
DGK0008A Package
200
°C/W
θJA
Junction to Ambient
NGT0008A Package
40
°C/W
(3)
For devices procurred in the WSON-8 package the Rds(on) limits are specified by design characterization data only.
4
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