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LTC4264 Folha de dados(PDF) 4 Page - Linear Technology

Nome de Peças LTC4264
Descrição Electrónicos  Synchronous No-Opto Flyback Controller
PDF  42 Pages
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Fabricante Electrônico  LINER [Linear Technology]
Página de início  http://www.linear.com
Logo LINER - Linear Technology

LTC4264 Folha de dados(HTML) 4 Page - Linear Technology

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LTC4278
4
4278fc
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
PWM Controller (Note 10)
Power Supply
VCC Operating Range
l
4.5
20
V
VCC Supply Current (ICC)
VCMP = Open (Note 11)
l
4
6.4
10
mA
VCC Shutdown Current
VCMP = Open, VUVLO = 0V
l
50
150
µA
Feedback Amplifier
Feedback Regulation Voltage (VFB)
l
1.220
1.237
1.251
V
Feedback Pin Input Bias Current
RCMP Open
200
nA
Feedback Amplifier Transconductance
∆IC = ±10µA
l
700
1000
1400
µmho
Feedback Amplifier Source or Sink Current
l
25
55
90
µA
Feedback Amplifier Clamp Voltage
VFB = 0.9V
VFB = 1.4V
2.56
0.84
V
V
Reference Voltage Line Regulation
12V ≤ VCC ≤ 18V
l
0.005
0.05
%/ V
Feedback Amplifier Voltage Gain
VCMP = 1.2V to 1.7V
1400
V/ V
Soft-Start Charging Current
VSFST = 1.5V
16
20
25
µA
Soft-Start Discharge Current
VSFST = 1.5V, VUVLO = 0V
0.7
1.3
mA
Control Pin Threshold (VCMP)
Duty Cycle = Min
1
V
Gate Outputs
PG, SG Output High Level
l
6.6
7.4
8
V
PG, SG Output Low Level
l
0.01
0.05
V
PG, SG Output Shutdown Strength
VUVLO = 0V; IPG, ISG = 20mA
l
1.6
2.3
V
PG Rise Time
CPG = 1nF
11
ns
SG Rise Time
CSG = 1nF
15
ns
PG, SG Fall Time
CPG, CSG = 1nF
10
ns
Current Amplifier
Switch Current Limit at Maximum VCMP
VSENSE+
l
88
98
110
mV
∆VSENSE /∆VCMP
0.07
V/ V
Sense Voltage Overcurrent Fault Voltage
VSENSE+, VSFST < 1V
l
206
230
mV
Timing
Switching Frequency (fOSC)
COSC = 100pF
l
84
100
110
kHz
Oscillator Capacitor Value (COSC)
(Note 12)
33
200
pF
Minimum Switch On Time (tON(MIN))
200
ns
Flyback Enable Delay Time (tENDLY)
265
ns
PG Turn-On Delay Time (tPGDLY)
200
ns
Maximum Switch Duty Cycle
l
85
88
%
SYNC Pin Threshold
l
1.53
2.1
V
SYNC Pin Input Resistance
40
kΩ



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