- 您現在的位置：買賣IC網 > Datasheet目錄40 > FAN5069EMTCX (Fairchild Semiconductor)IC REG DL BCK/LINEAR 16TSSOP Datasheet資料下載
參數資料
| 型號： | FAN5069EMTCX |
| 廠商： | Fairchild Semiconductor |
| 文件頁數： | 14/22頁 |
| 文件大小： | 622K |
| 描述： | IC REG DL BCK/LINEAR 16TSSOP |
| 產品變化通告： | Metallization Mask Rev 18/Apr/2007 |
| 標準包裝： | 2,500 |
| 拓撲： | 降壓（降壓）同步（1），線性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數： | 2 |
| 頻率 - 開關： | 200kHz |
| 電壓/電流 - 輸出 1： | 控制器 |
| 電壓/電流 - 輸出 2： | 控制器 |
| 帶 LED 驅動器： | 無 |
| 帶監控器： | 無 |
| 帶序列發生器： | 無 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | * |
| 封裝/外殼： | 16-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | * |
| 包裝： | 帶卷 (TR) |
?2005 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5069 Rev. 1.1.5
14
In the case of aluminum and polymer based capacitors,
the output capacitance is typically higher than normally
required to meet these requirements. While selecting the
ceramic capacitors for the output; although lower ESR
can be achieved easily, higher capacitance values are
required to meet the V
OUT(MIN)
restrictions during a load
transient. From the stability point of view, the zero
caused by the ESR of the output capacitor plays an
important role in the stability of the converter.
Output Capacitor Selection (LDO)
For stable operation, the minimum capacitance of 100礔
with ESR around 100m?is recommended. For other val-
ues, contact the factory.
Power MOSFET Selection (PWM)
The FAN5069 is capable of driving N-Channel MOSFETs
as circuit switch elements. For better performance,
MOSFET selection must address these key parameters:
?SPAN class="pst FAN5069EMTCX_2464147_3"> The maximum Drain-to-Source Voltage (V
DS
) should
be at least 25% higher than worst-case input voltage.
?SPAN class="pst FAN5069EMTCX_2464147_3"> The MOSFETs should have low Q
G
, Q
GD,
and Q
GS.
?SPAN class="pst FAN5069EMTCX_2464147_3"> The R
DS_ON
of the MOSFETs should be as low as possible.
In typical applications for a buck converter, the duty
cycles are lower than 20%. To optimize the selection of
MOSFETs for both the high-side and low-side, follow dif-
ferent selection criteria. Select the high-side MOSFET to
minimize the switching losses and the low-side MOSFET
to minimize the conduction losses due to the channel
and the body diode losses. Note that the gate drive
losses also affect the temperature rise on the controller.
For loss calculation, refer to Fairchild's Application Note
AN-6005 and the associated spreadsheet.
High-Side Losses
Losses in the MOSFET can be understood by following
the switching interval of the MOSFET in Figure 22. MOS-
FET gate drive equivalent circuit is shown in Figure 23.
Figure 22. Switching Losses and Q
G
Figure 23. Drive Equivalent Circuit
The upper graph in Figure 22 represents Drain-to-
Source Voltage (V
DS
) and Drain Current (I
D
) waveforms.
The lower graph details Gate-to-Source Voltage (V
GS
)
vs. time with a constant current charging the gate. The x-
axis is representative of Gate Charge (Q
G
). C
ISS
= C
GD
+ C
GS
and it controls t1, t2, and t4 timing. C
GD
receives
the current from the gate driver during t3 (as V
DS
is fall-
ing). Obtain the gate charge (Q
G
) parameters shown on
the lower graph from the MOSFET datasheets.
Assuming switching losses are about the same for both
the rising edge and falling edge, Q1's switching losses
occur during the shaded time when the MOSFET has
voltage across it and current through it.
Losses are given by (EQ. 10), (EQ. 11), and (EQ. 12):
P
UPPER
= P
SW
+ P
COND
(EQ. 10)
(EQ. 11)
(EQ. 12)
where P
UPPER
is the upper MOSFET's total losses and
P
SW
and P
COND
are the switching and conduction losses
for a given MOSFET. R
DS(ON)
is at the maximum junction
temperature (T
J
) and t
S
is the switching period (rise or
fall time) and equals t2+t3 (Figure 22.).
The driver's impedance and C
ISS
determine t2 while t3's
period is controlled by the driver's impedance and Q
GD
.
Since most of t
S
occurs when V
GS
= V
SP,
assume a con-
stant current for the driver to simplify the calculation of t
S
using the following equation:
(EQ. 13)
Most MOSFET vendors specify Q
GD
and Q
GS
. Q
G(SW)
can be determined as:
Q
G(SW)
= Q
GD
+ Q
GS
Q
TH
where Q
TH
is the gate
charge required to reach the MOSFET threshold (V
TH
).
Note that for the high-side MOSFET, V
DS
equals V
IN
,
which can be as high as 20V in a typical portable appli-
cation. Include the power delivered to the MOSFET's
(P
GATE
) in calculating the power dissipation required for
the FAN5069.
V
SP
t1
t2
t3
4.5V
t4
t5
G(SW)
V
DS
I
D
Q
GS
Q
GD
V
TH
V
GS
C
ISS
C
GD
C
ISS
Q
C
GD
R
D
G
R
GATE
C
GS
HDRV
5V
SW
VIN
P
SW
V
DS
I
L
?/DIV>
2
--------- ----------- - 2 t
s
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
F
SW
=
P
COND
V
OUT
V
IN
--- ---------- -
?/DIV>
?/DIV>
?/DIV>
?/DIV>
I
OUT
2
R
DS ON
( )
?/DIV>
?/DIV>
主站蜘蛛池模板：
威远县|
驻马店市|
石林|
如皋市|
枣强县|
开远市|
迁安市|
白银市|
泰安市|
姜堰市|
丰城市|
三都|
滁州市|
横峰县|
肥西县|
呼和浩特市|
老河口市|
惠东县|
崇阳县|
兰坪|
乐陵市|
象山县|
贵定县|
稷山县|
南充市|
九龙坡区|
绥芬河市|
蒲江县|
陆良县|
东乌|
开封县|
齐齐哈尔市|
织金县|
时尚|
高陵县|
陇川县|
武城县|
桐庐县|
永寿县|
岳西县|
金塔县|
=
t
s
Q
G SW
( )
I
Driver
--- ---------------- -
Q
G SW
( )
V
CC
V
SP
R
Driver
R
Gate
+
- ----------------- ----------------- -----
?/DIV>
?/DIV>
?/DIV>
?/DIV>
--------------- ----------------- ------------- -
H
=
相關PDF資料 |
PDF描述 |
|---|---|
| HIP1011BCB-T | IC CTRLR HOT PLUG PCI 16-SOIC |
| HIP1020CK-T | IC CTRLR HOT PLUG SOT23-5 |
| HIP6018BCBZ-T | IC REG TRPL BCK/LINEAR 24-SOIC |
| HIP6021CB-T | IC REG QD BCK/LINEAR 28-SOIC |
| HIP6521CB-T | IC REG QD BCK/LINEAR SYNC 16SOIC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN5069MTCX | 功能描述:開關變換器、穩壓器與控制器 PWM and ULDO Controller Combo RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| FAN5070 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:High Performance Programmable Synchronous DC-DC Controller |
| FAN5070M | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Voltage-Mode SMPS Controller |
| FAN5071 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms |
| FAN5071AB WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
發布緊急采購，3分鐘左右您將得到回復。