参数资料
| 型号： | AP5100WG-7 |
| 厂商： | Diodes Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.2A 26SOT |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.81 V ~ 15 V |
| 输入电压： | 4.75 V ~ 24 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 无 |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 包装： | 标准包装 |
| 供应商设备封装： | SOT-26 |
| 其它名称： | AP5100WG-7DIDKR |
AP5100
1.2A STEP-DOWN CONVERTER with 1.4MHz SWITCHING
FREQUENCY
Applications Information (cont.)
Setting the Output Voltage (cont.)
Choose the inductor ripple current to be 30% of the
maximum load current. The maximum inductor peak
current is calculated from:
ESR of the output capacitor dominates the output voltage
ripple. The amount of ripple can be calculated from the
equation below:
I L(MAX) = I LOAD +
Equation 3
Δ IL
2
Vout capacitor = Δ I inductor × ESR
P diode = (1 ? OUT ) × I out × 0.3V
Peak current determines the required saturation current
rating, which influences the size of the inductor. Saturating
the inductor decreases the converter efficiency while
increasing the temperatures of the inductor, the MOSFET
and the diode. Hence choosing an inductor with
appropriate saturation current rating is important.
A 1μH to 10μH inductor with a DC current rating of at least
25% percent higher than the maximum load current is
recommended for most applications.
For highest efficiency, the inductor’s DC resistance should
be less than 200m ? . Use a larger inductance for
improved efficiency under light load conditions.
Input Capacitor
The input capacitor reduces the surge current drawn from
the input supply and the switching noise from the device.
The input capacitor has to sustain the ripple current
produced during the on time on the upper MOSFET. It
must hence have a low ESR to minimize the losses.
Due to large dI/dt through the input capacitors, electrolytic
or ceramics should be used. If a tantalum must be used, it
must be surge protected. Otherwise, capacitor failure
could occur. For most applications, a 4.7μF ceramic
capacitor is sufficient.
An output capacitor with ample capacitance and low ESR
is the best option. For most applications, a 22μF ceramic
capacitor will be sufficient.
External Diode
The external diode’s forward current must not exceed the
maximum output current. Since power dissipation is a
critical factor when choosing a diode, it can be calculated
from the equation below:
V
V IN
Equation 5
Note: 0.3V is the voltage drop across the schottky diode. A
diode that can withstand this power dissipation must be
chosen.
External Bootstrap Diode
It is recommended that an external bootstrap diode be
added when the input voltage is no greater than 5V or the
5V rail is available in the system. This helps improve the
efficiency of the regulator. The bootstrap diode can be a
low cost one such as IN4148 or BAT54.
5V
Output Capacitor
The output capacitor keeps the output voltage ripple small,
ensures feedback loop stability and reduces the overshoot
BST
1
BOOST
DIODE
of the output voltage. The output capacitor is a basic
component for the fast response of the power supply. In
fact, during load transient, for the first few microseconds it
supplies the current to the load. The converter recognizes
the load transient and sets the duty cycle to maximum, but
AP5100
SW
6
10nF
L(I OUT +
Δ I inductor 2
C o =
2 ? V
( Δ V + V OUT )
the current slope is limited by the inductor value.
Maximum capacitance required can be calculated from the
following equation:
)
2
2
OUT
Equation 4
Where Δ V is the maximum output voltage overshoot.
Where Δ I inductor is the inductor ripple current.
Figure 6. External Bootstrap Diode
Under Voltage Lockout (UVLO)
Under Voltage Lockout is implemented to prevent the IC
malfunction from insufficient input voltages. For power-up,
the AP5100 must be enabled and the input voltage must
be higher than the UVLO rising threshold (4.0 V typ).
When the input voltage falls below the UVLO falling
threshold (UVLO rising threshold – UVLO hysteresis), the
AP5100 will latch an under voltage fault. In this event, the
output will fall low. To resume normal operation, the
AP5100 must be pulled above the UVLO rising threshold.
AP5100
Document number: DS32130 Rev. 3 - 2
8 of 12
April 2012
? Diodes Incorporated
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