- 您现在的位置：买卖IC网 > PDF目录15186 > ISL6223CAZA-T (Intersil)IC REG CTRLR BUCK PWM 20-SSOP PDF资料下载
参数资料
| 型号： | ISL6223CAZA-T |
| 厂商： | Intersil |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 20-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 频率 - 最大： | 305kHz |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
R IN
R FB
C c
FB
COMP
ISL6223
V IN
ERROR
AMPLIFIER
-
+
SAWTOOTH
GENERATOR
CORRECTION
+
COMPARATOR
-
+
PWM
CIRCUIT
PWM
HIP6601
Q2
Q1
L 01
I L
V CORE
-
PHASE
REFERENCE
DAC
DIFFERENCE
+
CURRENT
I SEN
R ISEN
SENSING
TO OTHER
CHANNEL
-
CURRENT
SENSING
FROM
ONLY ONE OUTPUT
STAGE SHOWN
OTHER
TO OVER
AVERAGING
CHANNEL
INDUCTOR
-
CURRENT
TRIP
+
COMPARATOR
REFERENCE
CURRENT
FROM
OTHER
CHANNEL
FIGURE 8. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM SHOWING CURRENT AND VOLTAGE SAMPLING
CORE Voltage Programming
The voltage identification pins (VID0, VID1, VID2, VID3 and
VID4) set the CORE output voltage. Each VID pin is pulled to
V CC by an internal 12μA current source and accepts
open-collector/open-drain/open-switch-to-ground or
standard low-voltage TTL or CMOS signals.
Table 1 shows the nominal DAC voltage as a function of the
VID codes. The power supply system is ± 1% accurate over
the operating temperature and voltage range.
Current Sensing and Balancing
Overview
2. Reduce the regulator output voltage with increasing load
current (droop)
3. Balance the I L currents in the two phases
Overcurrent, Selecting R ISEN
The current detected through the R ISEN resistor is averaged
with the current detected in the other channel. The averaged
current is compared with a trimmed, internally generated
current, and used to detect an overcurrent condition.
The nominal current through the R ISEN resistor should be
50 μ A at full output load current, and the nominal trip point for
overcurrent detection is 150% of that value, or 75μA.
Therefore:
The ISL6223 samples the on-state voltage drop across each
synchronous rectifier FET, Q2, as an indication of the
R ISEN = I L × r DS ( ON ) ( Q2 ) ? 50 μ A
(EQ. 1)
inductor current in that phase, see Figure 8. Neglecting AC
effects (to be discussed later), the voltage drop across Q2 is
simply r DS(ON) (Q2) x inductor current (I L ). Note that I L , the
inductor current, is 1/2 of the total current (I LT ).
The voltage at Q2’s drain, the PHASE node, is applied to the
R ISEN resistor to develop the I ISEN current to the ISL6223
ISEN pin. This pin is held at virtual ground, so the current
through R ISEN is I L x r DS(ON) (Q2) / R ISEN .
The I ISEN current provides information to perform the
following functions:
1. Detection of an overcurrent condition
10
For a full load of 25A per phase, and an r DS(ON) (Q2) of
4m Ω , R ISEN = 2k Ω .
The overcurrent trip point would be 150% of 25A, or
approximately 37.5A per phase. The R ISEN value can be
adjusted to change the overcurrent trip point, but it is
suggested to stay within ± 25% of nominal.
Droop, Selection of R IN
The average of the currents detected through the R ISEN
resistors is also steered to the FB pin. There is no DC return
path connected to the FB pin except for R IN , so the average
current creates a voltage drop across R IN . This drop increases
the apparent V CORE voltage with increasing load current,
causing the system to decrease V CORE to maintain balance at
FN9013.3
July 9, 2008
相关PDF资料 |
PDF描述 |
|---|---|
| IMC1210BN181K | INDUCTOR WW 180UH 10% 1210 |
| IMC1210BN151K | INDUCTOR WW 150UH 10% 1210 |
| IMC1210BN121K | INDUCTOR WW 120UH 10% 1210 |
| SRP1270-R68M | INDUCTOR 680NH 35A SMD |
| SRP1270-R47M | INDUCTOR 470NH 41A SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6223EVAL1 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Mobile Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller |
| ISL6223EVAL2 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Mobile Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller |
| ISL6224 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Single Output Mobile-Friendly PWM Controller |
| ISL6224_06 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Single Output Mobile-Friendly PWM Controller |
| ISL6224CA | 功能描述:电流型 PWM 控制器 Mobile-Friendly RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
发布紧急采购，3分钟左右您将得到回复。