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参数资料
| 型号： | ILC6377SO-33 |
| 厂商： | Impala Linear Corporation |
| 英文描述： | 0.5A, 300KHZ, SO-8 PWM/PFM STEP DOWN CONVERTER WITH SHUTDOWN |
| 中文描述： | 为0.5A，300kHz的SO - 8封装的PWM / PFM降压转换器具有关断 |
| 文件页数： | 6/11页 |
| 文件大小： | 684K |
| 代理商： | ILC6377SO-33 |
0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown
Impala Linear Corporation
6
(408) 574-3939
www.impalalinear.com
June 1999
ILC6377 1.3
The EXT1 and EXT2 pins are provided so as to drive
external transistors; thus allowing design flexibility.
The EXT output drive signal has the same timing as
the gate drive to the internal P-channel MOSFET i.e.
EXT output is low as long as the internal MOSFET is
on. Both EXT1 and EXT2 pins are capable of driving
1000pF gate capacitance. For example, a high out-
put current application circuit using an external P-
channel MOSFET is shown in figure 2.
V
O UT
ILC6377
(TOP VIEW)
3
4
5
1
2
6
7
8
+
C
L
+
V
IN
S/D
C
SS
SD1
L
*C
IN
EXT1
using external MOSFET
Figure 3. P-Channel Negative
Fig. 3: P-Channel Negative
C
BST
2200pF
Voltage between Vinand P_BST
must be less than 10V.
ILC6377
(TOP VIEW)
3
4
5
1
2
6
7
8
SD1
MA729
Schottky
P-Channel Boost Circuit
The ILC6377 includes a unique P-Channel MOSFET
architecture with built-in charge pump to maintain low
on-resistance even at low input voltages. As shown in
figure 3, a 2200pF ceramic capacitor and a schottky
diode ( MA729 or equivalent ) allows the gate voltage
of the internal P-Channel MOSFET to be driven neg-
ative; thus reducing the switch on-resistance. This
technique can be employed to increase efficiency at
low input voltages and high output currents.
Note that the voltage between V
IN
and P_BST should not
exceed 10V, otherwise damage to the device may occur.
For high input voltage applications the schottky diode
should be replaced by a low voltage zener diode so that the
P_BST pin is clamped to a safe negative voltage.
V
OUT
5
6
C
FB
R
FB1
R
FB2
R
FB1
+ R
FB2
≤
2M
C
FB
chosen so that
1kHz
π
×
CFB
×
RFB1
×
2
20kHz
<
<
To pin 8
Fig.4 Adjustable output using ILC6377SO-Adj
( Note : rest of circuit is same as Fig.1 )
Adjustable Output ( ILC6377SO-Adj )
For adjustable output voltage ILC6377SO-Adj should be
used. All connections to the ILC6377SO-Adj are the same
as ILC6377SO-XX, except for the feedback voltage divider
network shown in figure 4. The output voltage, V
OUT
, can be
calculated from the following equation:
V
OUT
= V
FB
( 1 + R
FB1
/R
FB2
),
where V
FB
is approximately 1V and
RFB1 + RFB2 < 2M
The feedback compensation capacitor should be chosen
such that the pole frequency f is between 1kHz and 20kHz:
1
2 x
Π
X CFB X RFB1
The pole frequency should generally be set at 5kHz. The
value of C
FB
calculated from the above equation may
require some adjustment depending on the output inductor
( L ) and output capacitor ( CL ) values chosen.
Example for 3V output :
RFB1 = 400k
RFB2 = 200k
CFB = 100pF
PC Board Layout
As with all switching DC-DC converter designs, good PC
board layout is critical for optimum performance.
The heavy
lines indicated in figure 1 schematic should be wide
printed circuit board traces and should be kept as short
as is practical.
A large ground plane with as much copper
area as is allowable should be used. All external compo-
nents should be mounted as close to the IC as possible. For
ILC6377SO-Adj, the feedback resistors and their associat-
ed wiring should be kept away from the inductor location
and the vicinity of inductive flux.
1kHz<
<20kHz
Fig. 2: 1Amp output current application using external MOSFET
Fig. 4: Adjustable output using ILC6377SO-Adj
相关PDF资料 |
PDF描述 |
|---|---|
| ILC6377SO-50 | 0.5A, 300KHZ, SO-8 PWM/PFM STEP DOWN CONVERTER WITH SHUTDOWN |
| ILC6377SO-ADJ | 0.5A, 300KHZ, SO-8 PWM/PFM STEP DOWN CONVERTER WITH SHUTDOWN |
| ILC6377 | 0.5A, 300KHZ, SO-8 PWM/PFM STEP DOWN CONVERTER WITH SHUTDOWN |
| ILC6382CIR-33 | 1-CELL TO 3-CELL BOOST WITH TRUE LOAD DISCONNECT, 3.3V, 5V OR ADJUSTABLE OUTPUT |
| ILC6382CIR-50 | 1-CELL TO 3-CELL BOOST WITH TRUE LOAD DISCONNECT, 3.3V, 5V OR ADJUSTABLE OUTPUT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ILC6377SO33X | 功能描述:开关变换器、稳压器与控制器 RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| ILC6377SO50 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown |
| ILC6377SO-50 | 制造商:IMPALA 制造商全称:IMPALA 功能描述:0.5A, 300KHZ, SO-8 PWM/PFM STEP DOWN CONVERTER WITH SHUTDOWN |
| ILC6377SO50X | 功能描述:开关变换器、稳压器与控制器 RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| ILC6377SOADJ | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:0.5A, 300kHz, SO-8 PWM/PFM Step Down Converter with Shutdown |
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