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參數(shù)資料
| 型號： | ISL6557 |
| 廠商： | Intersil Corporation |
| 英文描述： | PWM Controller with Wide Input Voltage Range 8-SOIC -20 to 85 |
| 中文描述： | 多相PWM控制器為核心電壓調(diào)節(jié) |
| 文件頁數(shù)： | 9/17頁 |
| 文件大?。?/td> | 532K |
| 代理商： | ISL6557 |
9
indefinitely as shown in Figure 6 as long as the controller is
enabled or until the overcurrent condition resolves.
VOLTAGE REGULATION
The ISL6557 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 differential 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 outputvoltage.
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
ISL6557 and all Intersil controllers to include all variations in
the amplifiers and reference so that the output voltage
remains within the specified system tolerance.
0A
0V
5ms/DIV
OUTPUT VOLTAGE,
500mV/DIV
OUTPUT CURRENT, 20A/DIV
FIGURE 6. OVERCURRENT BEHAVIOR IN HICCUP MODE
FIGURE 7. OUTPUT VOLTAGE AND LOAD-LINE
REGULATION
-
+
I
AVG
REFERENCE
VOLTAGE
EXTERNAL CIRCUIT
ISL6557 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
TABLE 1. VOLTAGE IDENTIFICATION CODES
VID4
VID3
VID2
VID1
VID0
VDAC
1
1
1
1
1
Off
1
1
1
1
0
1.100
1
1
1
0
1
1.125
1
1
1
0
0
1.150
1
1
0
1
1
1.175
1
1
0
1
0
1.200
1
1
0
0
1
1.225
1
1
0
0
0
1.250
1
0
1
1
1
1.275
1
0
1
1
0
1.300
1
0
1
0
1
1.325
1
0
1
0
0
1.350
1
0
0
1
1
1.375
1
0
0
1
0
1.400
1
0
0
0
1
1.425
1
0
0
0
0
1.450
0
1
1
1
1
1.475
0
1
1
1
0
1.500
0
1
1
0
1
1.525
0
1
1
0
0
1.550
0
1
0
1
1
1.575
0
1
0
1
0
1.600
0
1
0
0
1
1.625
0
1
0
0
0
1.650
0
0
1
1
1
1.675
0
0
1
1
0
1.700
0
0
1
0
1
1.725
0
0
1
0
0
1.750
0
0
0
1
1
1.775
0
0
0
1
0
1.800
0
0
0
0
1
1.825
0
0
0
0
0
1.850
ISL6557
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6557 WAF | 制造商:Intersil Corporation 功能描述: |
| ISL6557ACB | 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| ISL6557ACB-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| ISL6557ACBZ | 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(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):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) |
| 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(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):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) |
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