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| 型号： | SIC424CD-T1-GE3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 44MLP-28 |
| 标准包装： | 1 |
| 系列： | microBUCK® |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.75 V ~ 5.5 V |
| 输入电压： | 3 V ~ 28 V |
| 频率 - 开关： | 200kHz ~ 1MHz |
| 电流 - 输出： | 6A |
| 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： | 28-WFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 28-MLPQ（4x4） |
| 其它名称： | SIC424CD-T1-GE3DKR |
SiC414, SiC424
Vishay Siliconix
On-Time One-Shot Generator (t ON ) and Operating
Frequency
The figure 2 shows the on-chip implementation of on-time
generation. The FB Comparator output goes high when V FB
is less than the internal 750 mV reference. This feeds into the
gate drive and turns on the high-side MOSFET, and also
starts the one-shot timer. The one-shot timer uses an internal
comparator and a capacitor. One comparator input is
connected to V OUT , the other input is connected to the
capacitor. When the on-time begins, the internal capacitor
charges from zero volts through a current which is
proportional to V IN . When the capacitor voltage reaches
V OUT , the on-time is completed and the high-side MOSFET
t ON limitations and V5V Supply Voltage
For V5V below 4.5 V, the t ON accuracy may be limited by the
input voltage.
The original R tON equation is accurate if V IN satisfies the
below relation over the entire V IN range:
V IN < (V5V - 1.6 V) x 10
If V IN exceeds (V5V - 1.6 V) x 10, for all or part of the V IN
range, the R tON equation is not accurate. In all cases where
V IN > (V5V - 1.6 V ) x 10, the R tON equation must be modified
as follows.
turns off.
R tON =
1
25 pF x f sw
- 400 Ω x
(V5V - 1.6 V) x 10
V OUT
FB
V REF
FB comparator
-
+
Gate
dri v es
DH
V IN
Q1
V LX
L
V OUT
Note that when V IN > (V5V - 1.6 V) x 10, the actual on-time
is fixed and does not vary with V IN . When operating in this
condition, the switching frequency will vary inversely with V IN
rather than approximating a fixed frequency.
V OUT
V I N
One-shot
timer
DL
Q2
ESR
C OUT
+
FB
V OUT Voltage Selection
The switcher output voltage is regulated by comparing V OUT
R ton
On-time = K x R ton x ( V OUT/ V I N )
as seen through a resistor divider at the FB pin to the internal
750 mV reference voltage, see figure 3.
Figure 2 - On-Time Generation
This method automatically produces an on-time that is
proportional to V OUT and inversely proportional to V IN . Under
steady-state conditions, the switching frequency can be
determined from the on-time by the following equation.
V OUT
R 1
R 2
To FB pin
f S W =
V OUT
t O N x V I N
Figure 3 - Output Voltage Selection
The SIC414 and SiC424 uses an external resistor to set the
ontime which indirectly sets the frequency. The on-time can
be programmed to provide operating frequency from
200 kHz to 1 MHz using a resistor between the t ON pin and
ground. The resistor value is selected by the following
equation.
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.
R tON =
1
25 pF x f sw
- 400 Ω x
V IN
V OUT
V OUT = 0.75 x (1 + R 1 /R 2 ) + V RIPPLE /2
Enable and Power-Save Inputs
The maximum R tON value allowed is shown by the following
equation.
The EN/PSV and ENL inputs are used to enable or disable
the switching regulator and the LDO. When EN/PSV is low
(grounded), the switching regulator is off and in its lowest
R ton_MAX =
V I N _MI N
15 μ A
power state. When off, the output of the switching regulator
soft-discharges the output into a 10 ? internal resistor via the
V OUT pin. When EN/PSV is allowed to float, the pin voltage
Immediately after the on-time, the DL (drive signal for the
low side FET) output drives high to turn on the low-side
MOSFET. DL has a minimum high time of ~ 320 ns, after
which DL continues to stay high until one of the following
occurs:
? V FB falls below the 750 mV reference.
? The zero cross detector senses that the voltage on the LX
node is below ground. Power save is activated when a
zero crossing is detected.
will float to 33 % of the voltage at V5V. The switching
regulator turns on with power-save disabled and all switching
is in forced continuous mode. For V5V < 4.5 V, it is
recommended to force 33 % of the V5V voltage on the
EN/PSV pin to operate in forced continuous mode.
When EN/PSV is high (above 45 % of the voltage at V5V) for
SiC414, the switching regulator turns on with ultrasonic
www.vishay.com
10
For technical questions, contact: powerictechsupport@vishay.com
Document Number: 63388
S13-0248-Rev. B, 04-Feb-13
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
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