- 您現在的位置：買賣IC網 > PDF目錄383156 > ISL6557ACBZ (INTERSIL CORP) Multi-Phase PWM Controller for Core-Voltage Regulation PDF資料下載
參數資料
| 型號： | ISL6557ACBZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Multi-Phase PWM Controller for Core-Voltage Regulation |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | LEAD FREE, PLASTIC, MS-013AD, SOIC-24 |
| 文件頁數： | 9/19頁 |
| 文件大?。?/td> | 540K |
| 代理商： | ISL6557ACBZ |
9
system remains in this state while the controller counts 2048
phase-clock cycles.
NOTE: *Channels 3 and 4 are optional.
This is followed by a soft-start attempt (see
Soft-Start
). If the
soft-start attempt is successful, operation will continue as
normal. Should the soft-start attempt fail, the ISL6557A
repeats the 2048-cycle wait period and follows with another
soft-start attempt. This hiccup mode of operation continues
indefinitely as shown in Figure 6 as long as the controller is
enabled or until the overcurrent condition resolves.
VOLTAGE REGULATION
The ISL6557A uses a digital to analog converter (DAC) to
generate a reference voltage based on the logic signals at
pins VID4 to VID0. The DAC decodes the a 5-bit logic signal
(VID) into one of the discrete voltages shown in Table 1. Each
VID input offers a 20
μ
A pull up to 2.5V for use with open-drain
outputs. External pull-up resistors or active-high output
stages can augment the pull-up current sources, but a slight
accuracy error can occur if they are pulled above 2.9V.
.
The DAC-selected reference voltage is connected to the non-
inverting input of the error amplifier, and the output of the dif-
ferential remote-sense amplifier usually gets connected to
the error amplifier as shown in Figure 7. The remote-sense
amplifier eliminates voltage differences between local and
remote ground to provide a more accurate means of sensing
output voltage.
The integrating compensation network shown in Figure 7
assures that the steady-state error in the output voltage is
limited to the error in the reference voltage (output of the
DAC) plus offset errors in the remote-sense and error
amplifiers. Intersil specifies the guaranteed tolerance of the
ISL6557A and all Intersil controllers to include all variations
in the amplifiers and reference so that the output voltage
remains within the specified system tolerance.
FIGURE 5. CHANNEL-1 PWM FUNCTION AND CURRENT-
BALANCE ADJUSTMENT
÷
N
I
AVG
I
4
*
I
3
*
I
2
Σ
-
+
+
-
+
-
f(j
ω
)
PWM1
I
1
V
COMP
SAWTOOTH SIGNAL
I
ER
0A
0V
5ms/DIV
OUTPUT VOLTAGE,
500mV/DIV
OUTPUT CURRENT, 20A/DIV
FIGURE 6. OVERCURRENT BEHAVIOR IN HICCUP MODE
TABLE 1. VOLTAGE IDENTIFICATION CODES
VID4
VID3
VID2
VID1
VID0
VDAC
1
1
1
1
1
Off
1
1
1
1
0
0.800
1
1
1
0
1
0.825
1
1
1
0
0
0.850
1
1
0
1
1
0.875
1
1
0
1
0
0.900
1
1
0
0
1
0.925
1
1
0
0
0
0.950
1
0
1
1
1
0.975
1
0
1
1
0
1.000
1
0
1
0
1
1.025
1
0
1
0
0
1.050
1
0
0
1
1
1.075
1
0
0
1
0
1.100
1
0
0
0
1
1.125
1
0
0
0
0
1.150
FIGURE 7. OUTPUT-VOLTAGE AND LOAD-LINE
REGULATION
-
+
I
AVG
REFERENCE
VOLTAGE
EXTERNAL CIRCUIT
ISL6557A INTERNAL CIRCUIT
COMP
C
C
R
C
R
FB
FB
IOUT
VDIFF
VSEN
RGND
-
+
V
DROOP
ERROR AMPLIFIER
-
+
V
OUT
REMOTE
GROUND
DIFFERENTIAL
REMOTE-SENSE
AMPLIFIER
V
COMP
ISL6557A
相關PDF資料 |
PDF描述 |
|---|---|
| ISL6557ACBZ-T | Multi-Phase PWM Controller for Core-Voltage Regulation |
| ISL6557CB-T | Multi-Phase PWM Controller for Core-Voltage Regulation |
| ISL6557 | PWM Controller with Wide Input Voltage Range 8-SOIC -20 to 85 |
| ISL6557CB | PWM Controller with Wide Input Voltage Range 8-PDIP -20 to 85 |
| ISL6558CRZA-T | Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ISL6557ACBZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6557CB | 制造商:Intersil Corporation 功能描述: |
| ISL6557CB-T | 制造商:Intersil Corporation 功能描述: |
| ISL6557CB-T WAF | 制造商:Intersil Corporation 功能描述: |
| ISL6558CB | 功能描述:DC/DC 開關控制器 Precision MultiPhase RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
發(fā)布緊急采購，3分鐘左右您將得到回復。