LT1950 데이터 시트보기 (PDF) - Linear Technology
부품명
상세내역
제조사
LT1950 Datasheet PDF : 20 Pages
| |||
LT1950
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. COMP = open, FB = 1.4V, ROSC = 249k, SYNC = 0V, SLOPE = open, VREF
= 0.1µF, SHDN = VIN, BLANK = 0V, ISENSE = 0V, VIN2 = 15V, GATE = 1nF, BOOST = open, VIN = 15V, VSEC = 0V, unless otherwise
specified.
PARAMETER
Error Amplifier
CONDITIONS
MIN TYP MAX UNITS
FB Reference Voltage
FB Input Bias Current
3V < VIN < 25V, VOL + 0.2V < COMP < VOH – 0.2
FB = FB Reference Voltage
● 1.205 1.230 1.254
V
–75 –200
nA
Open Loop Voltage Gain
Unity Gain Bandwidth
VOL + 0.2V < COMP < VOH – 0.2
(Note 6)
65
85
dB
3
MHz
COMP Source Current
COMP Sink Current
FB = 1V, COMP = 1.6V
FB = 1.4V, COMP = 1.6V
● –0.3 –1.1 –1.8
mA
8
13
mA
COMP High Level: VOH
COMP Active Threshold
FB = 1V, ICOMP = – 250µA
Start of GATE Switching (Duty Cycle > 0%)
2.5
V
1.0
V
COMP Low Level: VOL
Current Sense
FB = 1.4V, ICOMP = 250µA
0.15
V
ISENSE Maximum Threshold
ISENSE Input Bias Current
Default Blanking Time
Adjustable Blanking Time
Duty Cycle < 10%, COMP = VOH
COMP = 2.5V, ISENSE = ISENSE Max Threshold
FB = 1V, COMP = 2V, ISENSE = 75mV
FB = 1V, COMP = 2V, ISENSE = 75mV
BLANK = 75k to Ground
90
100 110
mV
–125 –170 –250
µA
110
ns
290
ns
Blanking Override Voltage–
ISENSE Maximum Threshold
Turn-Off Delay to Gate
BLANK = Open, COMP = 2.5V (Note 4)
COMP = 2V
15
25
40
mV
60
ns
Slope Compensation (Note 4)
Internal Switcher
ISENSE Max Threshold (DC < 10%) – (DC = 80%) (Note 4)
Default, RSLOPE = ∞
2x Default, RSLOPE = 8k
3x Default, RSLOPE = 3.3k
14
mV
28
mV
42
mV
Boost Switch ILIMIT
Boost Switch Off Time
VIN2: Boost Disable
VIN2: Boost Disable Hysteresis
VIN2: Gate Enable
VIN2: Gate Enable Hysteresis
GATE Driver Output
VIN2 = 8V, 3V < VIN < 10V
VIN2 = 8V, 3V < VIN < 10V
3V < VIN < 10V
3V < VIN < 10V
3V < VIN < 10V, FB = 1V (Note 4)
3V < VIN < 10V, FB = 1V (Note 4)
70
125 180
mA
250 500 1000
ns
● 9.5
11.0 11.75
V
–1.0
V
● 7.0
8.2 9.27
V
– 0.6
V
GATE Rise Time
GATE Fall Time
GATE Clamp Voltage
GATE Low Level
GATE High Level
Maximum Duty Cycle
FB = 1V, VIN2 = 12V, CL = 1nF (Notes 3, 6)
FB = 1V, VIN2 = 12V, CL = 1nF (Notes 3, 6)
IGATE = 0µA, COMP = 2.5V, FB = 6V
IGATE = 20mA
IGATE = 200mA
IGATE = –20mA, VIN2 = 12V, COMP = 2.5V, FB = 6V
IGATE = –200mA, VIN2 = 12V, COMP = 2.5V, FB = 6V
FB = 1V, fOSC = 200kHz
50
ns
30
ns
11.5
13
14.5
V
0.25
0.4
V
1.2 1.75
V
10
V
9.75
V
90
95
97
%
1950fa
3
Share Link: 