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参数资料
| 型号： | ISL97519IUZ |
| 厂商： | Intersil |
| 文件页数： | 6/9页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1A 8MSOP |
| 标准包装： | 50 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 5 V ~ 25 V |
| 输入电压： | 2.3 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 600kHz，1.2MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-MSOP |
ISL97519
During the second cycle, the power FET turns off and the
Schottky diode is forward biased, (see Figure 12). The energy
stored in the inductor is pumped to the output supplying
output current and charging the output capacitor. The Schottky
V IN
C IN
L
D
C OUT
V OUT
diode side of the inductor is clamped to a Schottky diode
above the output voltage. So the voltage drop across the
ISL97519
Δ I L = Δ t2 × ----------------------------
inductor is V IN - V OUT . The change in inductor current during the
second cycle is shown in Equation 2:
V IN – V OUT
L
Δ I L2
Δ t 2
I L
Δ V O
Δ t2 = -------------
1 – D
f SW
(EQ. 2)
FIGURE 12. BOOST CONVERTER - CYCLE 2, POWER SWITCH
OPEN
D V IN 1 – D V IN – V OUT
---------- × -------- + ------------- × ---------------------------- = 0
f SW
f SW
For stable operation, the same amount of energy stored in the
inductor must be taken out. The change in inductor current
during the two cycles must be the same.
Δ I1 + Δ I2 = 0
L L
Output Voltage
An external feedback resistor divider is required to divide the
output voltage down to the nominal 1.294V reference voltage.
The current drawn by the resistor network should be limited to
maintain the overall converter efficiency. The maximum value
of the resistor network is limited by the feedback input bias
current and the potential for noise being coupled into the
feedback pin. A resistor network less than 100k is
V OUT 1
1 – D
V IN
------------- = -------------
(EQ. 3)
recommended. The boost converter output voltage is
determined by the relationship in Equation 4:
V OUT = V FB × ? ?
? R 1 ?
R 2 ?
L
D
?
1 + -------
(EQ. 4)
V IN
C IN
C OUT
V OUT
The nominal VFB voltage is 1.294V.
ISL97519
FIGURE 10. BOOST CONVERTER
L
Inductor Selection
The inductor selection determines the output ripple voltage,
transient response, output current capability, and efficiency. Its
selection depends on the input voltage, output voltage,
switching frequency, and maximum output current. For most
applications, the inductance should be in the range of 2μH to
33μH. The inductor maximum DC current specification must
be greater than the peak inductor current required by the
I L ( PEAK ) = ------------------------------- + 1 ? 2 × -----------------------------------------------
V IN
C IN
ISL97519
C OUT
V OUT
regulator. The peak inductor current can be calculated using
Equation 5:
I OUT × V OUT V IN × ( V OUT – V IN )
V IN L × V OUT × FREQ
(EQ. 5)
Δ V O
I L
Δ t 1
Δ I L1
Output Capacitor
Low ESR capacitors should be used to minimize the output
voltage ripple. Multilayer ceramic capacitors (X5R and X7R)
are preferred for the output capacitors because of their lower
FIGURE 11. BOOST CONVERTER - CYCLE 1, POWER SWITCH
CLOSED
ESR and small packages. Tantalum capacitors with higher ESR
can also be used. The output ripple can be calculated in
Equation 6:
Δ V O = ----------------------- + I OUT × ESR
I OUT × D
f SW × C O
(EQ. 6)
For noise sensitive applications, a 0.1μF placed in parallel with
the larger output capacitor is recommended to reduce the
switching noise coupled from the LX switching node.
6
FN6454.4
February 16, 2012
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