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LM3481 Arkusz danych(PDF) 6 Page - Texas Instruments

Numer części LM3481
Szczegółowy opis  LM3481 / -Q1 High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

LM3481 Arkusz danych(HTML) 6 Page - Texas Instruments

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LM3481, LM3481-Q1
SNVS346F – NOVEMBER 2007 – REVISED NOVEMBER 2014
www.ti.com
Electrical Characteristics (continued)
VIN= 12 V, RFA= 40 kΩ, TJ = 25°C, unless otherwise indicated.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VFA/SYNC/SD = 3 V
(3), V
IN = 12 V
9
VFA/SYNC/SD = 3 V
(3), V
IN = 12 V,
15
–40°C
≤ TJ ≤ 125°C
IQ
Quiescent Current in Shutdown Mode
µA
VFA/SYNC/SD = 3 V
(3), V
IN = 5 V
5
VFA/SYNC/SD = 3 V
(3), V
IN = 5 V, –40°C
10
≤ TJ ≤ 125°C
160
VSENSE
Current Sense Threshold Voltage
mV
–40°C
≤ TJ ≤ 125°C
100
190
220
VSC
Over Load Current Limit Sense Voltage
mV
–40°C
≤ TJ ≤ 125°C
157
275
VSL
Internal Compensation Ramp Voltage
90
mV
VCOMP = 1.4 V
85
Output Over-voltage Protection (with
VOVP
mV
respect to feedback voltage)(4)
VCOMP = 1.4 V, –40°C ≤ TJ ≤ 125°C
26
135
VCOMP = 1.4 V
70
Output Over-Voltage Protection
VOVP(HYS)
mV
Hysteresis
VCOMP = 1.4 V, –40°C ≤ TJ ≤ 125°C
28
106
VCOMP = 1.4 V
450
Gm
Error Amplifier Transconductance
µmho
VCOMP = 1.4 V, –40°C ≤ TJ ≤ 125°C
216
690
VCOMP = 1.4 V, IEAO = 100 µA
60
(Source/Sink)
AVOL
Error Amplifier Voltage Gain
V/V
VCOMP = 1.4 V, IEAO = 100 µA
35
66
(Source/Sink), –40°C
≤ TJ ≤ 125°C
Source, VCOMP = 1.4 V, VFB = 1.1 V
640
µA
Source, VCOMP = 1.4 V, VFB = 1.1 V,
475
837
–40°C
≤ TJ ≤ 125°C
Error Amplifier Output Current (Source/
IEAO
Sink)
Sink, VCOMP = 1.4 V, VFB = 1.4 V
65
µA
Sink, VCOMP = 1.4 V, VFB = 1.4 V,
31
100
–40°C
≤ TJ ≤ 125°C
Upper Limit: VFB = 0 V, COMP Pin
2.70
Floating
V
Upper Limit: VFB = 0 V, COMP Pin
2.45
2.93
Floating, –40°C
≤ TJ ≤ 125°C
VEAO
Error Amplifier Output Voltage Swing
Lower Limit: VFB = 1.4 V
0.60
V
Lower Limit: VFB = 1.4 V, –40°C ≤ TJ
0.32
0.90
≤ 125°C
tSS
Internal Soft-Start Delay
VFB = 1.2 V, COMP Pin Floating
8.7
15
21.3
ms
tr
Drive Pin Rise Time
Cgs = 3000 pf, VDR = 0 V to 3 V
25
ns
tf
Drive Pin Fall Time
Cgs = 3000 pf, VDR = 3 V to 0 V
25
ns
Output = High (Shutdown)
1.31
V
Output = High (Shutdown), –40°C
1.40
TJ ≤ 125°C
Shutdown signal
VSD
threshold(5)FA/SYNC/SD pin
Output = Low (Enable)
0.68
V
Output = Low (Enable), –40°C
≤ TJ
0.40
125°C
(3)
For this test, the FA/SYNC/SD Pin is pulled to 3 V using a 40-k
Ω resistor.
(4)
The overvoltage protection is specified with respect to the feedback voltage. This is because the overvoltage protection tracks the
feedback voltage. The overvoltage threshold can be calculated by adding the feedback voltage (VFB) to the overvoltage protection
specification.
(5)
The FA/SYNC/SD pin should be pulled to VIN through a resistor to turn the regulator off. The voltage on the FA/SYNC/SD pin must be
above the max limit for the Output = High longer than 30 µs to keep the regulator off and must be below the minimum limit for Output =
Low to keep the regulator on.
6
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Copyright © 2007–2014, Texas Instruments Incorporated
Product Folder Links: LM3481 LM3481-Q1


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