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參數(shù)資料
| 型號(hào)： | EL7566 |
| 廠商： | Intersil Corporation |
| 英文描述： | Monolithic 6 Amp DC-DC Step-Down Regulator |
| 中文描述： | 單片6安培的DC - DC降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 490K |
| 代理商： | EL7566 |
9
FN7102.5
December 1, 2004
Detailed Description
The EL7566 is a 6A capable buck regulator operating from
an input voltage range of 3V to 6V. The duty cycle can be
adjusted from 0% to 100% allowing for a wide range of
programmable output voltages. Patented on-chip
resistorless current-sensing enables current mode control
for excellent step load response. Overcurrent, Overvoltage,
input Undervoltage, and thermal protection is integrated
along with soft-start and power-up sequencing features to
produce an overall robust power solution for general
purpose applications.
EL7566DRE vs. EL7566AIRE
The EL7566AIRE includes the following feature changes
from the EL7566DRE:
Up to 6A Current
Sinking
Capability
Expanded Temperature Range: -40
o
C to 85
o
C
No Overvoltage Protection
Start-Up
The EL7566 employs a digital soft-start feature to suppress
the in-rush current needed to charge the output capacitance
and smoothly ramp the output voltage to regulation (See
Figure 12). The normal start-up process begins when the
input voltage reaches the rising POR threshold (~2.8V) and
EN pin is transitioned HIGH by an internal 2.5μA current
source. The output voltage is then digitally ramped to
regulation over a 2ms period. The 2ms soft start-up time can
be extended if needed by configuring the STP and STN pins.
(refer to Full Start-Up Control section).
If the input voltage is ramped slowly, soft-start may be
initiated before the input supply has reached regulation. The
lower input voltage will have increased current demand
during start-up and may risk an overcurrent event. To
prevent such an event from occurring, a capacitor can be
placed from the EN pin to GND to program a delay between
when the rising POR threshold for VIN is met and when soft-
start begins. The programmable delay time, T
D
, is governed
by Equation 1.
where:
C
EN
is the capacitance at EN pin
V
EN_HI
is the EN input high level (function of V
DD
voltage,
see Figure 5)
I
EN
is the EN pin pull-up current, nominal 2.5μA
Steady-State Operation
Under all steady-state conditions the converter will operate
in fixed frequency continuous-conduction mode. For fast
transient response and ease of controllability, a peak
current-mode control method is employed. The inductor
current is sensed from the upper PMOS. This current signal
serves as the ramp to the PWM comparator and is compared
against the difference signal generated by the
transconductance error amplifier. Slope compensation for
the ramp is used to allow for 100% duty cycle operation (see
Figure 20). The pulse-width modulated square wave output
of the PWM comparator is amplified and serves as the gate
drive signals for the switching power FETs.
100% DUTY RATIO
EL7566 uses CMOS as internal synchronous power
switches. The upper and lower switches are PMOS and
NMOS respectively. The upper PMOS saves the need for a
boot capacitor normally seen in NMOS/NMOS half-bridges.
FIGURE 18. ADJUSTABLE START-UP
FIGURE 19. TRACKING START-UP
Waveforms
V
IN
= V
D
= 5V, V
O
= 2.5V, I
O
= 6A, f
S
= 500kHz, L = 2.7μH, C
IN
= 100μF, C
OUT
= 150μF, T
A
= 25°C unless otherwise noted.
(Continued)
V
IN
(5V/DIV)
I
IN
(2A/DIV)
V
O
(2V/DIV)
PG
5ms/DIV
V
IN
(5V/DIV)
V
O1
=2.5V
V
O2
=1.8V
5ms/DIV
T
D
C
EN
V
EN
-------------------
×
=
EL7566
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EL7566AIREZ-T13 | Monolithic 6 Amp DC-DC Step-Down Regulator |
| EL7566DREZ-T13 | Monolithic 6 Amp DC-DC Step-Down Regulator |
| EL7571CM | CABLE ASSEMBLY; 7/16 MALE TO 7/16 FEMALE, 50 OHM, 1/2" HELICAL FLEX COAX JUMPER ASSEMBLY; WHITE BRONZE CONNECTORS WITH SILVER CONTACTS; 72" CABLE LENGTH |
| EL7571CM-T13 | CABLE ASSEMBLY; 7/16 MALE TO R/A 7/16 MALE, 50 OHM, 1/2" HELICAL FLEX COAX JUMPER ASSEMBLY; WHITE BRONZE CONNECTORS WITH SILVER CONTACTS; 36" CABLE LENGTH |
| EL7571CMZ | Programmable PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL7566_06 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Monolithic 6A DC/DC Step-Down Regulator |
| EL7566AIREZ | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 EL7566AIREZ MONOLITH 8 AMP DC:DC STP-DNGT RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7566AIREZ-T13 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 EL7566AIREZ MONOLITH 6 AMP DC:DC STP-DNGT RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7566AIREZ-T7 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 EL7566AIREZ MONOLITH 7 AMP DC:DC STP-DNGT RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7566DRE | 功能描述:IC REG BUCK SYNC ADJ 6A 28HTSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
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