參數(shù)資料
型號(hào): LT1737
廠商: Linear Technology Corporation
英文描述: High Power Switching Regulator for Isolated Flyback Controller(大功率,用于隔離回掃控制器的開(kāi)關(guān)穩(wěn)壓器)
中文描述: 大功率開(kāi)關(guān)穩(wěn)壓器(大功率,用于隔離回掃控制器的開(kāi)關(guān)穩(wěn)壓器的隔離反激式控制器)
文件頁(yè)數(shù): 3/24頁(yè)
文件大?。?/td> 294K
代理商: LT1737
3
LT1737
Note 1:
Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2:
Component value range guaranteed by design.
The
G
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
°
C. V
CC
= 14V, GATE open, V
C
= 1.4V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
Current Amplifier
V
C
Control Pin Threshold
Duty Cycle = Min
ELECTRICAL CHARACTERISTICS
MIN
TYP
MAX
UNITS
0.90
0.80
220
200
1.12
1.25
1.35
270
280
V
V
G
V
ISENSE
Switch Current Limit
Duty Cycle
30%
Duty Cycle
30%
Duty Cycle = 80%
250
mV
mV
mV
mV
G
220
0.30
V
ISENSE
/
V
C
Timing
f
Switching Frequency
C
OSCAP
= 100pF
90
80
33
100
115
125
200
kHz
kHz
pF
ns
ns
ns
k
%
G
C
OSCAP
t
ON
t
ED
t
EN
R
t
Oscillator Capacitor Value
Minimum Switch On Time
Flyback Enable Delay Time
Minimum Flyback Enable Time
Timing Resistor Value
Maximum Switch Duty Cycle
Load Compensation
Sense Offset Voltage
Current Gain Factor
UVLO Function
V
UVLO
UVLO Pin Lockout Threshold
UVLO Pin Shutdown Threshold
(Note 2)
R
tON
= 50k
R
ENDLY
= 50k
R
MENAB
= 50k
(Note 2)
200
200
200
24
85
240
G
90
2
5
mV
mV
0.80
0.95
1.05
G
1.21
1.25
0.75
1.29
V
V
V
G
0.4
–0.25
–4.50
0.95
+0.25
–2.50
I
UVLO
UVLO Pin Bias Current
V
UVLO
= 1.2V
V
UVLO
= 1.3V
+0.1
–3.5
μ
A
μ
A
3V Output Function
V
REF
Reference Output Voltage
Output Impedance
Current Limit
I
LOAD
= 1mA
G
2.8
3.0
10
15
3.2
V
G
8
mA
PIU
PGND (Pin 1):
The power ground pin carries the GATE
node discharge current. This is typically a current spike of
several hundred mA with a duration of tens of nanosec-
onds. It should be connected directly to a good quality
ground plane.
I
SENSE
(Pin 2):
Pin to measure switch current with external
sense resistor. The sense resistor should be of a nonin-
ductive construction as high speed performance is essen-
tial. Proper grounding technique is also required to avoid
distortion of the high speed current waveform. A preset
internal limit of nominally 250mV at this pin effects a
switch current limit.
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