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| 型号： | FAN5069EMTCX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/22页 |
| 文件大小： | 622K |
| 描述： | IC REG DL BCK/LINEAR 16TSSOP |
| 产品变化通告： | Metallization Mask Rev 18/Apr/2007 |
| 标准包装： | 2,500 |
| 拓扑： | 降压（降压）同步（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 2 |
| 频率 - 开关： | 200kHz |
| 电压/电流 - 输出 1： | 控制器 |
| 电压/电流 - 输出 2： | 控制器 |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | * |
| 包装： | 带卷 (TR) |
?2005 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5069 Rev. 1.1.5
10
Block Diagram
Figure 20. Block Diagram
Detailed Operation Description
FAN5069 combines a high-efficiency, fixed-frequency
PWM controller designed for single-phase synchronous
buck Point-Of-Load converters with an integrated LDO
controller to support GTL-type loads. This controller is
ideally suited to deliver low-voltage, high-current power
supplies needed in desktop computers, notebooks,
workstations, and servers. The controller comes with an
integrated boot diode which helps reduce component
cost and increase space savings. With this controller, the
input to the power supply can be varied from 3V to 24V
and the output voltage can be set to regulate at 0.8V to
15V on the switcher output. The LDO output can be con-
figured to regulate between 0.8V to 3V and the input to
the LDO can be from 1.5V to 5V, respectively. An internal
shunt regulator at the VCC pin facilitates the controller
operation from either a 5V or 12V power source.
V
CC
Bias Supply
FAN5069 can be configured to operate from 5V or 12V
for V
CC
. When 5V supply is used for V
CC
, no resistor is
required to be connected between the supply and the
V
CC
. When the 12V supply is used, a resistor R
VCC
is
connected between the 12V supply and the V
CC,
as
shown in Figure 1. The internal shunt regulator at the
VCC pin is capable of sinking 150mA of current to
ensure that the controllers internal V
CC
is maintained at
5.6V maximum.
Choose a resistor such that:
?SPAN class="pst FAN5069EMTCX_2464147_4"> It is rated to handle the power dissipation.
?SPAN class="pst FAN5069EMTCX_2464147_4"> Current sunk within the controller is minimized to
prevent IC temperature rise.
R
VCC
Selection (IC)
The selection of R
VCC
is dependent on:
?SPAN class="pst FAN5069EMTCX_2464147_4"> Variation of the 12V supply
?SPAN class="pst FAN5069EMTCX_2464147_4"> Gate charge of the top and bottom FETs (Q
FET
)
?SPAN class="pst FAN5069EMTCX_2464147_4"> Switching frequency (F
SW
)
?SPAN class="pst FAN5069EMTCX_2464147_4"> Shunt regulator minimum current (1mA)
?SPAN class="pst FAN5069EMTCX_2464147_4"> Quiescent current of the IC (I
Q
)
Calculate R
VCC
based on the minimum input voltage for
the V
CC
:
(EQ. 1)
For a typical example, where: Vin
MIN
= 11.5V, I
Q
= 3mA,
Q
FET
= 30nC, F
SW
= 300KHz, R
VCC
is calculated to be
398.65?
PWM Section
The FAN5069s PWM controller combines the conven-
tional voltage mode control and current sensing through
lower MOSFET R
DS_ON
to generate the PWM signals.
This method of current sensing is loss-less and cost
effective. For more accurate current sense requirements,
an optional external resistor can be connected with the
bottom MOSFET in series.
Current
Sense
Amplifier
FB
COMP
SS
Vref
Vcc
ILIM
R
ILIM
10糀
10糀
Current Limit
Comparator
Internal
Boot Diode
Internal Vcc 5.6V Max.
OSC
R
S
Q
PWM
EN
R(RAMP)
Ramp
Generator
Enable
Vcc
C
O
L
O
BOOT
Vout
R
RAMP
Error
Amplifier
PWM
Comparator
C
BOOT
V
IN
V
IN
Shunt Reg
HDRV
SW
LDRV
PGND
Summing
?/DIV>
Amplifier
Adaptive
Gate Drive
Circuit
R
VCC
Vin
MIN
5.6
I
Q
1 10
"
3
Q
FET
F
SW
1.2
"
"
+
+
(
)
----------- ----------------- ----------------- ----------------- ----------------- ---------- -
=
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