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参数资料
| 型号： | EL7566DRE-EVAL |
| 厂商： | Intersil |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | DEMO BOARD FOR EL7566 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 6A |
| 输入电压： | 3 ~ 6 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | EL7566 |
EL7566
It also allows 100% turn-on of the upper PMOS switch,
achieving V O close to V IN . The maximum achievable V O is:
V O = V IN – ( R L + R DSON1 ) × I O
Where R L is the DC resistance on the inductor and R DSON1
is the PMOS on-resistance, nominally 30m Ω at room
temperature with a temperature coefficient of 0.2m Ω /°C.
OSC pin to GND (C OSC ). The triangle waveform has 95%
duty ratio and runs from 0.2V to 1.2V. Refer to the curve in
Figure 6 for the appropriate value of C OSC for the desired
frequency. If external synchronization is desired, the circuit
in Figure 21 can be used.
100pF
OUTPUT VOLTAGE SELECTION
EL7566
C OSC
EXTERNAL SYNC
SOURCE
The output voltage can be as high as the input voltage minus
the PMOS and inductor voltage drops (as seen previously in
V O = 0.8 × ? 1 + ------- ?
Equation 2). Referring to the Typical Application Circuit on
page 2, use R 1 and R 2 to set the output voltage according to
the following formula:
? R 1 ?
? R 2 ?
Some standard values of R 1 and R 2 are listed in Table 1.
TABLE 1.
FIGURE 20. EXTERNAL SYNC CIRCUIT
Always choose the converter self-switching frequency 20%
lower than the sync frequency to accommodate component
variations.
Protection Features
The EL7566 features a wide range of protective measures to
prevent the persistence of damaging system conditions.
These features are overvoltage, overcurrent, Power-On-
V O (V)
0.8
1
1.2
1.5
1.8
2.5
3.3
R 1 (k Ω )
2
2.49
4.99
10
12.7
21.5
36
R 2 (k Ω )
Open
10
10
11.5
10.2
10
11.5
Reset (POR), and Thermal Shutdown protection.
OVERVOLTAGE PROTECTION (OVP)
The EL7566 monitors the output voltage and will shut down
if it exceeds 110% of the set regulation point. This is
accomplished by comparing the reference to the FB pin
voltage. If an overvoltage condition is met, the controller will
turn the high-side switch off, the low-side switch on, and pull
PGOOD low. The converter will not latch off and will proceed
with a soft-start as soon as the fault condition is cleared.
OVERCURRENT PROTECTION (OCP)
It is important that the series combination of R1 and R2 is
large enough as to not draw excessive current from the
output.
VOLTAGE MARGINING
The EL7566 has built-in 5% load stress test (commonly
called voltage margining) function. Combinations of TM and
SEL set the margins shown in Table 2. When this function is
not used, both pins should be connected to SGND, either
directly or through a 10k Ω resister. Figure 16 shows this
feature.
TABLE 2.
The current information for PWM ramp generation is also
used for overcurrent protection. The measured current is
compared against a preset Overcurrent threshold (~7-10A).
If the output current exceeds the threshold, the output will
shut down by turning off the high-side switch and turning the
low-side switch on. This event, like OVP, will not latch the
converter off. A soft-start will be initiated when the fault is
cleared.
POWER-ON RESET (POR)
To ensure proper regulator operation, a power-on reset
feature monitors the input voltage. When adequate input
voltage is achieved (V DD > 2.8V), the converter is allowed to
CONDITION
Normal
High Margin
Low Margin
TM
0
1
1
SEL
X
1
0
V O
Nominal
Nominal + 5%
Nominal - 5%
soft-start. However, if V DD falls below 2.5V, the regulator will
shut down in the same manner as OVP or OCP.
THERMAL PROTECTION AND JUNCTION
TEMPERATURE INDICATOR
An internal temperature sensor continuously monitors the
SWITCHING FREQUENCY
The regulator has a programmable switching frequency of
200kHz to 1MHz. The switching frequency is generated by a
relaxation comparator and adjusted by a capacitor from the
10
junction temperature. If the junction temperature exceeds
135°C, the regulator is in a fault condition and will shut
down. When the temperature falls back below 110°C, the
regulator goes through the soft-start procedure again.
FN7102.7
May 8, 2006
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相关代理商/技术参数 |
参数描述 |
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| EL7566DRE-T13 | 功能描述:IC REG BUCK SYNC ADJ 6A 28HTSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 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:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR |
| EL7566DRE-T7 | 功能描述:IC REG BUCK SYNC ADJ 6A 28HTSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 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:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR |
| EL7566DREZ | 功能描述:直流/直流开关调节器 EL7566DREZ 6 AMP DC: DC STP DWNG 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 |
| EL7566DREZ-T13 | 功能描述:直流/直流开关调节器 EL7566DREZ 6 AMP DC: DC STP DWNG 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 |
| EL7566DREZ-T7 | 功能描述:直流/直流开关调节器 EL7566DREZ 6 AMP DC: DC STP DWNG 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 |
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