- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄368740 > 1977EFE (Linear Technology Corporation) High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100uA Quiescent Current PDF資料下載
參數(shù)資料
| 型號： | 1977EFE |
| 廠商： | Linear Technology Corporation |
| 英文描述： | High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100uA Quiescent Current |
| 中文描述： | 高電壓，500kHz降壓1.5安培的電流型開關(guān)穩(wěn)壓器的靜態(tài)電流為100uA |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 288K |
| 代理商： | 1977EFE |
LT1977
10
1977f
APPLICATIOU
W
U
U
50nA FB pin input current. The suggested value for the
output divider resistor (see Figure 2) from FB to ground
(R2) is 100k or less. A formula for R1 is shown below. A
table of standard 1% values is shown in Table 2 for
common output voltages.
V
R
nA
1 25
2 50
+
.
R
R
OUT
1
2
–1 25
=
More Than Just Voltage Feedback
The FB pin is used for more than just output voltage
sensing. It also reduces switching frequency and con-
trols the soft-start voltage ramp rate when output voltage
is below the regulated level (see the Frequency Foldback
and Soft-Start Current graphs in Typical Performance
Characteristics).
Frequency foldback is used to control power dissipation in
both the IC and in the external diode and inductor during
short-circuit conditions. A shorted output requires the
switching regulator to operate at very low duty cycles. As
a result the average current through the diode and induc-
tor is equal to the short-circuit current limit of the switch
(typically 2A for the LT1977). Minimum switch on time
limitations would prevent the switcher from operating at a
sufficiently low duty cycle if switching frequency were
maintained at 500kHz, so frequency is reduced by about
4:1 when the FB pin voltage drops below 0.4V (see
Frequency Foldback graph). In addition, if the current in
the switch exceeds 1.5 times the current limitations speci-
fied by the V
C
pin, due to minimum switch on time, the
LT1977 will skip the next switch cycle. As the feedback
voltage rises, the switching frequency increases to 500kHz
with 0.95V on the FB pin. During frequency foldback,
external synchronization is disabled to prevent interfer-
ence with foldback operation. Frequency foldback does
not affect operation during normal load conditions.
In addition to lowering switching frequency the soft-start
ramp rate is also affected by the feedback voltage. Large
capacitive loads or high input voltages can cause a high
input current surge during start-up. The soft-start func-
tion reduces input current surge by regulating switch
current via the V
C
pin to maintain a constant voltage ramp
rate (dV/dt) at the output. A capacitor (C1 in Figure 2) from
the C
SS
pin to the output determines the maximum output
dV/dt. When the feedback voltage is below 0.4V, the V
C
pin
will rise, resulting in an increase in switch current and
output voltage. If the dV/dt of the output causes the current
through the C
SS
capacitor to exceed I
CSS
the V
C
voltage is
reduced resulting in a constant dV/dt at the output. As the
feedback voltage increases I
CSS
increases, resulting in an
increased dV/dt until the soft-start function is defeated
with 0.9V present at the FB pin. The soft-start function
does not affect operation during normal load conditions.
However, if a momentary short (brown out condition) is
present at the output which causes the FB voltage to drop
below 0.9V, the soft-start circuitry will become active.
Table 2
OUTPUT
VOLTAGE
(V)
2.5
3
3.3
5
6
8
10
12
R1
OUTPUT
ERROR
(%)
0
0
0.38
0
0.63
–0.63
–0.25
0.63
R2
NEAREST (1%)
(k
)
100
140
165
300
383
536
698
866
(k
, 1%)
100
100
100
100
100
100
100
100
SOFT-START
FOLDBACK
DETECT
500kHz
OSCILLATOR
–
+
ERROR
AMP
1.25V
V
C
11
FB
12
C
SS
V
OUT
9
SW
LT1977
C1
R1
R2
1977 F02
2
Figure 2. Feedback Network
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 1977IFE | High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100uA Quiescent Current |
| 1982995-1 | Pluggable Bus Bar Connectors & Sockets |
| 19MT050XF | FULL BRIDGE FREDFET MTP HEXFET POWER MOSFET |
| 19TQ015S | SCHOTTKY RECTIFIER |
| 19U200PG1K | Pressure Sensors Low-Cost, Stainless Steel, Isolated Sensors |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 1977IFE | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100uA Quiescent Current |
| 1977-XX-XXX | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:1977 Series High Frequency Coaxial SPD |
| 1978 | 功能描述:電池組 RECHARGEABLE BATTRY PACK RoHS:否 制造商:Ultralife 電池大小: 電池數(shù)量: 輸出電壓:3.7 V 容量: 化學(xué)性質(zhì):Lithium 端接類型:Wire |
| 19780 | 功能描述:KIT METER RES DIG TEMP/HUMIDITY RoHS:否 類別:靜電控制，ESD，無塵室產(chǎn)品 >> 監(jiān)視器，測試儀 系列:- 產(chǎn)品目錄繪圖:19226 標(biāo)準(zhǔn)包裝:1 系列:- 類型:工作站監(jiān)視器 使用:工作面，腕帶監(jiān)視 特點:連續(xù)監(jiān)視，NIST 可追溯，單芯系統(tǒng) 電源類型:AC 適配器 包括:AC 適配器，證書，軟線，五金件 其它名稱:16-1116 |
| 19-780 | 制造商:GC Electronics 功能描述:Squeeze Bottle Dispense Solvents In The Required Amounts In The Proper Location |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。