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| 型号： | ISL8013IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 16QFN |
| 产品培训模块： | ISL8013/4 Synchronous Buck Regulators |
| 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： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-QFN（4x4） |
| 产品目录页面： | 1248 (CN2011-ZH PDF) |
| 其它名称： | ISL8013IRZ-TDKR |
ISL8013
Typical Operating Performance
PHASE 2V/DIV
(Unless otherwise noted, operating conditions are: T A = +25°C,
V VIN = 2.5V to 5.5V, EN = V IN , SYNCH = 0V, L = 1.5μH,
C 1 = 2x22μF, C 2 = 2x22μF, I OUT = 0A to 3A) . (Continued)
LX 2V/DIV
V OUT 1V/DIV
V OUT 0.5V/DIV
IL 2A/DI V
PG 5V/DIV
FIGURE 33. OUTPUT SHORT CIRCUIT
5.000
4.875
4.750
4.625
4.500
4.375
4.250
4.125
IL 2A/DI V
PG 5V/DIV
FIGURE 34. OUTPUT SHORT CIRCUIT RECOVERY
OCP_3.3V IN
OCP_5V IN
4.000
-50
-25
0
25
50
75
100
TEMPERATURE (°C)
FIGURE 35. OUTPUT CURRENT LIMIT vs TEMPERATURE
Theory of Operation
The ISL8013 is a step-down switching regulator
optimized for battery-powered handheld applications.
The regulator operates at 1MHz fixed switching
frequency under heavy load conditions to allow smaller
external inductors and capacitors to be used for minimal
printed-circuit board (PCB) area. At light load, the
regulator reduces the switching frequency, unless forced
to the fixed frequency, to minimize the switching loss and
to maximize the battery life. The quiescent current when
the output is not loaded is typically only 35μA. The
supply current is typically only 0.1μA when the regulator
is shut down.
PWM Control Scheme
Pulling the SYNCH pin HI (>2.5V) forces the converter
into PWM mode, regardless of output current. The
ISL8013 employs the current-mode pulse-width
modulation (PWM) control scheme for fast transient
response and pulse-by-pulse current limiting. Figure 2
shows the block diagram. The current loop consists of the
oscillator, the PWM comparator, current sensing circuit
12
and the slope compensation for the current loop stability.
The gain for the current sensing circuit is typically
250mV/A. The control reference for the current loops
comes from the error amplifier's (EAMP) output.
The PWM operation is initialized by the clock from the
oscillator. The P-Channel MOSFET is turned on at the
beginning of a PWM cycle and the current in the
MOSFET starts to ramp up. When the sum of the current
amplifier CSA and the slope compensation (237mV/μs)
reaches the control reference of the current loop, the
PWM comparator COMP sends a signal to the PWM logic
to turn off the P-MOSFET and turn on the N-Channel
MOSFET. The N-MOSFET stays on until the end of the
PWM cycle. Figure 36 shows the typical operating
waveforms during the PWM operation. The dotted lines
illustrate the sum of the slope compensation ramp and
the current-sense amplifier’s CSA output.
The output voltage is regulated by controlling the V EAMP
voltage to the current loop. The bandgap circuit outputs
a 0.8V reference voltage to the voltage loop. The
feedback signal comes from the VFB pin. The soft-start
FN6309.3
November 23, 2009
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相关代理商/技术参数 |
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| ISL8013IRZ-TS2715 | 制造商:Intersil Corporation 功能描述:S SPEC FOR TRACKING BROADCOM BUSINESS ONLY-SOLD THRU DISTI - Tape and Reel |
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| ISL8014AIRZ | 功能描述:直流/直流开关调节器 4A LW QUIESCENT CUR 1 6MHZ 4X4 16LD 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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