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参数资料
| 型号： | LT3781IG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM CM 20-SSOP |
| 标准包装： | 1,800 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 700kHz |
| 占空比： | 100% |
| 电源电压： | 8 V ~ 72 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
LT3781
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are T A = 25 ° C.
V CC = V BST = 12V, V BSTREF = 0V, V VC = 2V, V TS = 0V, V FB = V REF = 1.25V, C TG = C BG = C SG = 1000pF.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Error Amp
V FB
Error Amplifier Reference Voltage
Measured at Feedback Pin
1.242
1.250
1.258
V
q
1.225
1.265
V
I FB
A V
Feedback Input Current
Error Amplifier Voltage Gain
V FB = V REF
–50
72
nA
dB
I VC
Error Amplifier Current Limit
Source
Sink
q
q
10
0.5
25
1
mA
mA
V VC
Zero Current Output Voltage
Maximum Output Voltage
1.4
3.2
V
V
GBW
Gain Bandwidth Product
(Note 3)
1
MHz
Current Sense
A V
I SENSE
Amplifier DC Gain
Input Bias Current
12
– 275
V/V
μ A
V SENSE
Current Limit Threshold
Measured at SENSE Pin
135
150
165
mV
q
130
170
mV
t D
Current Sense to Switch Delay
175
ns
t MIN
Switch Minimum On Time
Measured at BG Output
250
ns
THERM and OVLO Fault Detectors
V THERM /
V OVLO
t D
Threshold (Rising Edge)
Threshold Hysteresis
Fault Delay to Output Disable
>50mV Overdrive
q
q
1.2
20
1.25
40
650
1.3
60
V
mV
ns
Oscillator and Synchronization Decoder
f OSC
Oscillator Frequency, Free Run
Measured at F SET Pin
700
kHz
I FSET
Frequency Programming Error
FSET Input Bias Current
f OSC ≤ 500kHz (Note 3)
F SET Charging, V FSET = 2V
q
–10
50
5
%
nA
V SYNC
f SYNC
t H, L
SYNC Logic High Input Threshold
SYNC Logic Low Input Threshold
SYNC Frequency
Maximum SYNC Pulse Width
Positive-Going Edge
Negative-Going Edge
f OSC = Oscillator Free-Run Frequency
q
q
q
0.8
f OSC /2
1.4
1.4
2
350
1/f OSC
V
V
kHz
s
(Logic High or Logic Low)
Output Drivers
V TG
t TGr/f
TG On Voltage
TG Off Voltage
TG Rise/Fall Time
10% to 90%/90% to 10%
q
q
11
11.5
0.1
35
0.5
V
V
ns
V BG
t BGr/f
V SG
t SGr/f
BG On Voltage
BG Off Voltage
BG Rise/Fall Time
SG On Voltage
SG Off Voltage
SG Rise/Fall Time
10% to 90%/90% to 10%
10% to 90%/90% to 10%
q
q
q
q
11
11
11.5
0.1
35
11.5
0.1
35
12
0.5
12
0.5
V
V
ns
V
V
ns
t SG-BG
SG to BG Enable Lag Time
4V On/Off Thresholds
q
80
150
300
ns
t TG-BG
TG to BG Enable Lag Time
4V On/Off Thresholds
100
ns
3781f
3
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