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參數(shù)資料
| 型號： | LT1683IG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Ultralow Noise Push-Pull DC/DC Controller |
| 中文描述： | SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 5.30 MM, PLASTIC, SSOP-20 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 237K |
| 代理商： | LT1683IG |
8
LT1683
1683f
CS (Pin 4):
This is the input to the current sense amplifier.
It is used for both current mode control and current
slewing of the external MOSFETs. Current sense is accom-
plished via a sense resistor (R
S
) connected from the
sources of the external MOSFETs to ground. CS is con-
nected to the top of R
S
. Current sense is referenced to the
GND pin.
The switch maximum operating current will be equal to
0.1V/R
S
. At CS = 0.1V, the gate drivers will be immediately
turned off (no slew control).
If CS = 0.22V in addition to the drivers being turned off, V
C
and SS will be discharged to ground (short-circuit protec-
tion). This will hasten turn off on subsequent cycles.
FB (Pin 9):
The feedback pin is used for positive voltage
sensing. It is the inverting input to the error amplifier. The
noninverting input of this amplifier connects internally to
a 1.25V reference.
If the voltage on this pin exceeds the reference by 220mV,
then the output drivers will immediately turn off the
external MOSFETs (no slew control). This provides for
output overvoltage protection
When this input is below 0.9V then the current sense
blanking will be disabled. This will assist start up.
NFB (Pin 10):
The negative feedback pin is used for
sensing a negative output voltage. The pin is connected to
the inverting input of the negative feedback amplifier
through a 100k source resistor. The negative feedback
amplifier provides a gain of –0.5 to the FB pin. The nominal
regulation point would be –2.5V on NFB. This pin should
be left open if not used.
If NFB is being used then overvoltage protection will occur
at 0.44V below the NFB regulation point.
At NFB < –1.8 current sense blanking will be disabled.
V
C
(Pin 12):
The compensation pin is used for frequency
compensation and current limiting. It is the output of the
error amplifier and the input of the current comparator.
Loop frequency compensation can be performed with an
RC network connected from the V
C
pin to ground. The
voltage on V
C
is proportional to the switch peak current.
The normal range of voltage on this pin is 0.25V to 1.27V.
However, during slope compensation the upper clamp
voltage is allowed to increase with the compensation.
During a short-circuit fault the V
C
pin will be discharged to
ground.
PIU
+
5pF
IN5819
20mA
2
1683 F01a
ZVN3306A
10
GATE A/GATE B
CAP A/CAP B
Figure 1a. Typical Test Circuitry
Figure 1b. Test Circuit for Slew
+
5pF
IN5819
0.9A
0.1
1683 F01b
Si4450DY
10
GATE A/GATE B
CS
CAP A/CAP B
TEST CIRCUITS
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