参数资料
| 型号： | ISL78010ANZ |
| 厂商： | Intersil |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI-OUTP 32-TQFP |
| 标准包装： | 180 |
| 应用： | LCD 显示器，车用 |
| 电流 - 电源： | 1.7mA |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-TQFP |
| 供应商设备封装： | 32-TQFP（5x5） |
| 包装： | 托盘 |
ISL78010
Table 2 gives typical values (margins are considered 10%,
3%, 20%, 10%, and 15%) on V IN , V O , L, f S , and I OMAX .
TABLE 2. TYPICAL V IN , V O , L, f S , AND I OMAX VALUES
capacitor. The voltage rating of the output capacitor should
be greater than the maximum output voltage.
NOTE: Capacitors have a voltage coefficient that makes their
effective capacitance drop as the voltage across them increases.
V IN (V)
3.3
3.3
3.3
5
5
5
V O (V)
9
12
15
9
12
15
L ( μH)
6.8
6.8
6.8
6.8
6.8
6.8
f S
(MHz)
1
1
1
1
1
1
I OMAX
(A)
0.490686
0.307353
0.197353
0.743464
0.465686
0.29902
C OUT in Equation 7 assumes the effective value of the capacitor at a
particular voltage and not the manufacturer ’s stated value, measured
at zero volts.
Compensation
The ISL78010 can operate in either P-mode or PI-mode.
P-mode may be preferred in applications where excellent
transient load performance is required but regulation is not
critical. Connecting the CINT pin directly to V IN will enable
P-mode; for better load regulation, use PI-mode with a 4.7nF
capacitor in series with a 10k resistor between CINT and
Input Capacitor
An input capacitor is used to supply the peak charging
current to the converter. It is recommended that C IN be
larger than 10μF. The reflected ripple voltage will be smaller
with larger C IN . The voltage rating of the input capacitor
should be larger than the maximum input voltage.
Boost Inductor
The boost inductor is a critical part which influences the
output voltage ripple, transient response, and efficiency.
Values of 3.3μH to 10μH are to match the internal slope
compensation. The inductor must be able to handle the
following average (Equation 5) and peak (Equation 6)
current:
I O (EQ. 5)
1 – D
I LAVG = -------------
ground. This value may be reduced to improve transient
performance; however, very low values will reduce loop
stability. Figures 5 through 10 show a comparison of P-mode
vs PI-mode performance.
Boost Feedback Resistors
As the boost output voltage, A VDD , is reduced below 12V,
the effective voltage feedback in the IC increases the ratio of
voltage to current feedback at the summing comparator
because R 2 decreases relative to R 1 . To maintain stable
operation over the complete current range of the IC, the
voltage feedback to the FBB pin should be reduced
proportionally, as A VDD is reduced. This can be
accomplished by means of a series resistor-capacitor
network (R 7 and C 7; Equations 8 and 9) in parallel with R 1 ,
with a pole frequency (f p ) set to approximately 10kHz for
C 2 (effective) = 10μF and 4kHz for C 2 (effective) = 30μF.
R 7 = ? ? ---------------------- ? – ------- ?
R 1 ?
? ? 0.1 × R ?
2
Δ I L
I LPK = I LAVG + --------
(EQ. 6)
2
1 1 – 1
(EQ. 8)
C 7 = -------------------------------------------------
Rectifier Diode
A high-speed diode is necessary due to the high switching
1
2 × 3.142 × f p × R 7
(EQ. 9)
V O – V IN I O 1
V RIPPLE = I LPK × ESR + ------------------------ × ---------------- × -----
V C f
frequency. Schottky diodes are recommended because of
their fast recovery time and low forward voltage. The rectifier
diode must meet the output current and peak inductor
current requirements.
Output Capacitor
The output capacitor supplies the load directly and reduces
the ripple voltage at the output. Output ripple voltage
consists of two components: the voltage drop due to the
inductor ripple current flowing through the ESR of output
capacitor, and the charging and discharging of the output
capacitor (Equation 7).
(EQ. 7)
O OUT S
For low ESR ceramic capacitors, the output ripple is
dominated by the charging and discharging of the output
11
PI-Mode C INT (C 23 ) and R INT (R 10 )
The IC is designed to operate with a minimum C 23 capacitor
of 4.7nF and a minimum C 2 (effective) = 10μF.
Note that, for high voltage A VDD , the voltage coefficient of
ceramic capacitors (C 2 ) reduces their effective capacitance
greatly; a 16V, 10μF ceramic can drop to around 3μF at 15V.
To improve the transient load response of A VDD in PI-mode,
a resistor may be added in series with the C 23 capacitor. The
larger the resistor, the lower the overshoot, but at the
expense of stability of the converter loop, especially at high
currents.
With L = 10μH, A VDD = 15V, and C 23 = 4.7nF, C 2 (effective)
should have a capacitance of greater than 10μF. R INT (R 7 )
can have values up to 5k Ω for C 2 (effective) up to 20μF and
up to 10k for C 2 (effective) up to 30μF.
FN6501.2
December 4, 2013
相关PDF资料 |
PDF描述 |
|---|---|
| ISL78200AVEZ | IC REG BUCK BOOST SYNC 20HTSSOP |
| ISL78205AVEZ | IC REG BUCK SYNC ADJ 20HTSSOP |
| ISL78210ARUZ-T | IC REG MULTI-OUTPUT 32TQFP |
| ISL78211ARZ | IC REG 1PHASE BUCK 40QFN |
| ISL78213ARZ | IC REG BUCK SYNC ADJ 3A 16VQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL78010ANZ-T | 功能描述:直流/直流开关调节器 AUTO GRD TFT-LCD PWR SUPPLY RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL78010EVAL1Z | 功能描述:EVAL BOARD 1 FOR ISL78010 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL78020 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Automotive Grade TFT-LCD DC/DC with Integrated Amplifiers |
| ISL78020ANZ | 制造商:Intersil Corporation 功能描述:CONV DC-DC SGL-OUT STEP UP 32TQFP - Trays 制造商:Intersil 功能描述:AUTO GRD TFT-LCD DC- DC W/INTEGRTD AMP |
| ISL78020ANZ-T | 制造商:Intersil Corporation 功能描述:CONV DC-DC SGL-OUT STEP UP 32TQFP - Tape and Reel 制造商:Intersil 功能描述:AUTO GRD TFT-LCD DC- DC W/INTEGRTD AMP |
发布紧急采购，3分钟左右您将得到回复。