Linear Technology DC1335B-C - LTC4269-1 | PoE Powered Device w/48V Isolated Auxiliary DC1335B-C DC1335B-C 数据表
产品代码
DC1335B-C
LTC4269-1
4
42691fc
ELECTRICAL CHARACTERISTICS
The
l
denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
PWM Controller (Note 10)
Power Supply
V
CC
Turn-On Voltage, V
CC(ON)
l
14
15.3
16
V
V
CC
Turn-Off Voltage, V
CC(OFF)
●
8
9.7
11
V
V
CC
Hysteresis
V
CC(ON)
– V
CC(OFF)
●
4
5.6
6.5
V
V
CC
Shunt Clamp
V
UVLO
= 0V, I
VCC
= 15mA
●
19.5
20.5
V
V
CC
Supply Current (I
CC
) V
CMP
= Open (Note 11)
●
4
6.4
10
mA
V
CC
Start-Up Current
V
CC
= 10V
●
180
400
μA
Feedback Amplifi er
Feedback Regulation Voltage (V
FB
)
●
1.220
1.237
1.251
V
Feedback Pin Input Bias Current
R
CMP
Open
200
nA
Feedback Amplifi er Transconductance
ΔI
C
= ±10μA
●
700
1000
1400
μmho
Feedback Amplifi er Source or Sink Current
●
25
55
90
μA
Feedback Amplifi er Clamp Voltage
V
FB
= 0.9V
V
FB
= 1.4V
2.56
0.84
0.84
V
V
V
Reference Voltage Line Regulation
12V ≤ V
CC
≤ 18V
●
0.005
0.02
%/ V
Feedback Amplifi er Voltage Gain
V
CMP
= 1.2V to 1.7V
1400
V/ V
Soft-Start Charging Current
V
SFST
= 1.5V
16
20
25
μA
Soft-Start Discharge Current
V
SFST
= 1.5V, V
UVLO
= 0V
0.8
1.3
mA
Control Pin Threshold (V
CMP
)
Duty Cycle = Min
1
V
Gate Outputs
PG, SG Output High Level
●
6.6
7.4
8
V
PG, SG Output Low Level
●
0.01
0.05
V
PG, SG Output Shutdown Strength
V
UVLO
= 0V; I
PG
, I
SG
= 20mA
●
1.6
2.3
V
PG Rise Time
C
PG
= 1nF
11
ns
SG Rise Time
C
SG
= 1nF
15
ns
PG, SG Fall Time
C
PG
, C
SG
= 1nF
10
ns
Current Amplifi er
Switch Current Limit at Maximum V
CMP
V
SENSE
+
●
88
98
110
mV
ΔV
SENSE
/ΔV
CMP
0.07
V/ V
Sense Voltage Overcurrent Fault Voltage
V
SENSE
+
, V
SFST
< 1V
●
206
230
mV
Timing
Switching Frequency (f
OSC
)
C
OSC
= 100pF
●
84
100
110
kHz
Oscillator Capacitor Value (C
OSC
)
(Note 12)
33
200
pF
Minimum Switch On Time (t
ON(MIN)
)
200
ns
Flyback Enable Delay Time (t
ENDLY
)
265
ns
PG Turn-On Delay Time (t
PGDLY
)
200
ns
Maximum Switch Duty Cycle
●
85
88
%
SYNC Pin Threshold
●
1.53
2.1
V
SYNC Pin Input Resistance
40
kΩ