参数资料
| 型号： | SC410MLTRT |
| 厂商： | Semtech |
| 文件页数： | 13/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 10MLPD |
| 标准包装： | 1 |
| 系列： | EcoSpeed® |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.75 V ~ 7.5 V |
| 输入电压： | 5.5 V ~ 24 V |
| 频率 - 开关： | 200kHz ~ 1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-MLPD（3x3） |
| 其它名称： | SC410MLDKR |
SC410
Applications Information (continued)
-
+
FB
Ref.
V LX_FILTER
V IN
PWM
S
R
One-Shot
Timer
Q
Hi-side
and
Lo-side
Gate
Drivers
V IN
Q1
V LX
Q2
LPF
L
ESR
C OUT
+
V LX_FILTER
V OUT
FB
V OUT Voltage Selection
The switcher output voltage is regulated by comparing
V OUT as seen through a resistor divider at the FB pin to the
internal 750mV reference voltage, see Figure 3.
V OUT To FB pin
R 1
R 2
R TON
Time = K x (V OUT /V IN )
Figure 2 — On-Time Generation
f SW
R 1 V RIPPLE
R 2
V OUT 0 . 75 1
1 V IN
25pF f SW
V OUT
R TON _ MAX
?
?
Thismethodautomaticallyproducesanon-timethatis
proportional to V OUT and inversely proportional to V IN .
Under steady-state operating conditions in continuous
conduction mode, the switching frequency can be deter-
mined from the on-time by the following equation.
V OUT
t ON V IN
The SC410 uses an external resistor to set the on-time
which indirectly sets the frequency. The on-time can be
programmed to provide operating frequencies from
200kHz to 1MHz using a resistor between the TON pin
and ground. The resistor value is selected by the follow-
ing equation.
R TON 400 1 . 2
The maximum R TON value allowed is shown by the follow-
ing equation.
V IN _ MIN
10 1 . 5 A
Immediately after the on-time, the DL (the drive
signal for the low side FET) output drives high to
turn on the low-side MOSFET. DL has a minimum
high time of ~320ns, after which DL continues to
stay high until one of the following occurs:
V FB falls below the 750mV reference
The zero cross detector senses that the voltage
on the LX node is below ground. PSAVE is acti-
Figure 3 — Output Voltage Selection
Note that this control method regulates the valley of the
output ripple voltage, not the DC value. The DC output
voltage V OUT is offset by the output ripple according to
the following equation.
2
Enable Input
The EN input is used to enable or disable the switching
regulator. When EN is low (grounded), the switching regu-
lator and LDO are disabled and the SC410 is in its lowest
power state. When disabled, the output power switches
are tri-stated. When EN is higher than 0.8V, the internal
LDO will be activated. The switching regulator remains off
until the voltage at the EN pin exceeds 1.5V.
The EN pin can be used for implementing UVLO for the
input voltage by configuring a voltage divider from VIN to
EN to PGND.
Continuous Mode Operation
The SC410 operates in CCM (Continuous Conduction
Mode) at larger load currents when the load is greater
than or equal to half of the inductor ripple current (Figure
4). In this mode one of the power MOSFETs is always on,
with no intentional dead time other than to avoid cross-
conduction. This mode of operation results in uniform
frequency.
vated 8 periods after the zero cross is detected.
13
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