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LM3447 データシート(PDF) 4 Page - Texas Instruments

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部品番号 LM3447
部品情報  Phase Dimmable, Primary Side Power Regulated PFC Flyback Controller for LED Lighting
PDF  25 Pages
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

LM3447 データシート(HTML) 4 Page - Texas Instruments

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LM3447
SNOSC65 A – APRIL 2012 – REVISED MAY 2012
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise specified –40°C < TJ = TA < 125°C, VCC = 14V, VTSNS = 1.75V, VFLT2 = 1.75V, VAUX = 0.5V, VINV = 0V, SP
IVAC = 100μA, IBIAS = 100μA, CVCC = 10μF, CCOMP = 0.047μF, RHLD = 10kΩ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CURRENT SENSE COMPARATOR (ISNS)
ISNS(TH)
Current limit threshold
239
275
305
mV
RISNS(LEB)
ISNS pull down impedance
1.13
k
Ω
tISNS(LEB)
Leading edge blanking time
170
ns
ERROR AMPLIFIER (INV, COMP)
VREF
Reference voltage
VFLT2 = 1.5 V, VTSNS = 1.75 V
0.95
1
1.05
V
IINV(BIAS)
Input bias current
VINV = VREF
45
nA
GM
Transconductance
VCOMP = VREF
100
μmho
Current source capacity
VINV = 0 V
77
104
μA
ICOMP
Current sink capacity
VINV = 2V
50
77
μA
COMP(LOW)
Minimum PWM ramp voltage
IVAC = 110 μA, VINV = 1 V
280
mV
D(MAX)
Maximum duty cycle
IVAC = 110 μA, VINV = 0 V
76.5%
VALLEY DETECT CIRCUIT (AUX)
AUX(OVP)
Overvoltage protection
VAUX rising
1.67
1.75
1.83
V
tAUX(LEB)
AUX leading edge blanking
1.84
μs
IAUX(SOURCE)
AUX source current
VAUX = –0.3 V
207
μA
tAUX(TO)
Valley detect timeout
VAUX = 1 V
4
μs
PWM OSCILLATOR AND FAULT TIMER
tOSC
Oscillator period
13.9
14.5
15.1
μs
tFAULT
Fault timer
812
ms
THERMAL FOLDBACK (TSNS)
TSNS(OC)
Open circuit voltage
1.67
1.75
1.83
V
TSNS(TH)
Thermal foldback threshold
VTSNS falling
0.955
1
1.045
V
RTSNS
(1)
Internal pull-up resistor
TJ = 25°C
7.09
7.88
8.67
k
Ω
THERMAL SHUTDOWN
TSD(TH)
(2)
Thermal shutdown temperature
165
°C
TSD(HYS)
(2)
Thermal shutdown hysteresis
25
°C
(1)
Resistance varies with junction temperature and has typical temperature coefficient of 25ppm/°C.
(2)
Device performance at or near thermal shutdown temperature is not specified or assured.
4
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Copyright © 2012, Texas Instruments Incorporated
Product Folder Links: LM3447



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