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参数资料
| 型号： | LT1680IN |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | High Power DC/DC Step-Up Controller |
| 中文描述： | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封装： | 0.300 INCH, PLASTIC, DIP-16 |
| 文件页数： | 6/16页 |
| 文件大小： | 322K |
| 代理商： | LT1680IN |
6
LT1680
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
RUN/SHDN Input Current
vs Pin Voltage
Operating Frequency
(Normalized) vs Temperature
Maximum Duty Cycle vs R
CT
R
CT
(k
)
1
2
4
6
M
100
90
80
70
60
50
40
30
20
10
0
10
20
40 60
100
1680 G20
I
DISCHG
= 2.1mA
I
DISCHG
= 2.75mA
FULL OPERATING
TEMPERATURE
RANGE
TEMPERATURE (
°
C)
–50
O1.01
1.00
0.99
0.98
25
75
1680 G21
–25
0
50
100
125
RUN/SHDN PIN VOLTAGE (V)
0
R
μ
A
600
450
300
150
0
2
4
6
8
1680 G19
10
12
UPPER
LIMIT
LOWER
LIMIT
TYPICAL
FULL OPERATING
TEMPERATURE
RANGE
SL/ADJ (Pin 1):
Slope Compensation Adjustment. Allows
increased slope compensation for certain high duty cycle
applications. Resistive loading of this pin increases effec-
tive slope compensation. A resistor divider from the 5V
REF
pin can tailor the onset of additional slope compensation
to specific regions in each switch cycle. Pin can be floated
or connected to 5V
REF
if no additional slope compensation
is required. (See Applications Information section for
slope compensation details.)
C
T
(Pin 2):
Oscillator Timing Pin. Connect a capacitor
(C
CT
) to ground and a pull-up resistor (R
CT
) to the 5V
REF
supply. Typical values are C
CT
= 1000pF and 10k
≤
R
CT
≤
30k.
I
AVG
(Pin 3):
Average Current Limit Integration. Fre-
quency response characteristic is set using the 50k
output impedance and external capacitor to ground.
Averaging roll-off is typically set 1 to 2 orders of magni-
tude below switching frequency. (Typical capacitor value
= 1000pF for f
O
= 100kHz.) Shorting this pin to SGND will
disable the average current limit function. In systems
where open-loop inductor current occurs, such as boost
supplies during output short-circuit condition and inrush
periods, an external small-signal protection diode should
be connected between I
AVG
and the V
C
pin (anode to I
AVG
pin, cathode to V
C
pin). See Applications Information.
PI
FU
CTIO
N
S
U
U
SS (Pin 4):
Soft Start. Generates ramping threshold for
regulator current limit during start-up and after UVLO
events by sourcing about 10
μ
A into an external capacitor.
V
C
(Pin 5):
Error Amplifier Output. RC load creates domi-
nant compensation in power supply regulation feedback
loop to provide optimum transient response. (See Appli-
cations Information section for compensation details.)
SGND (Pin 6):
Small-Signal Ground. Connect to negative
terminal of C
OUT
.
V
FB
(Pin 7):
Error Amplifier Inverting Input. Used as
voltage feedback input node for regulator loop. Pin sources
about 0.5
μ
A DC bias current to protect from an open
feedback path condition.
V
REF
(Pin 8):
Bandgap Generated Voltage Reference
Decoupling. Connect a capacitor to signal ground. (Typi-
cal capacitor value
≈
0.1
μ
F.)
SENSE
+
(Pin 9):
Current Sense Amplifier Inverting Input.
Connect to most positive (DC) terminal of current sense
resistor.
SENSE
–
(Pin 10):
Current Sense Amplifier Noninverting
Input. Connect to most negative (DC) terminal of current
sense resistor.
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