参数资料
| 型号： | ISL6557ACB-T |
| 厂商： | Intersil |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-SOIC |
| 标准包装： | 1,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 75% |
| 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： | 24-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
ISL6557A
indefinitely as shown in Figure 6 as long as the controller is
enabled or until the overcurrent condition resolves.
OUTPUT CURRENT, 20A/DIV
0A
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.
TABLE 1. VOLTAGE IDENTIFICATION CODES
VID4
VID3
VID2
VID1
VID0
VDAC
OUTPUT VOLTAGE,
500mV/DIV
1
1
1
1
1
1
1
1
1
1
1
0
1
0
1
Off
0.800
0.825
0V
5ms/DIV
1
1
1
1
1
0
0
1
0
1
0.850
0.875
The DAC-selected reference voltage is connected to the non-
FIGURE 6. OVERCURRENT BEHAVIOR IN HICCUP MODE
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.
.
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.
1
1
1
1
1
1
1
1
1
1
1
0
0
1
1
1
0
0
0
0
0
0
0
0
1
1
0
0
0
1
1
1
1
0
0
0
0
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0.900
0.925
0.950
0.975
1.000
1.025
1.050
1.075
1.100
1.125
1.150
1.175
1.200
EXTERNAL CIRCUIT
ISL6557A INTERNAL CIRCUIT
0
1
1
0
1
1.225
R C
C C
COMP
FB
ERROR AMPLIFIER
-
0
0
0
0
1
1
1
1
1
0
0
0
0
1
1
0
0
1
0
1
1.250
1.275
1.300
1.325
R FB
+
V DROOP
-
IOUT
I AVG
+ V COMP
REFERENCE
VOLTAGE
0
0
1
0
0
1
0
1
0
1
1.350
1.375
VDIFF
0
0
0
0
1
1
1
0
0
1
1.400
1.425
V OUT
REMOTE
GROUND
VSEN
RGND
+
-
DIFFERENTIAL
REMOTE-SENSE
AMPLIFIER
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
1
0
0
0
1
0
1
0
1.450
1.475
1.500
1.525
1.550
FIGURE 7. OUTPUT-VOLTAGE AND LOAD-LINE
REGULATION
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6557ACBZ | 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6557ACBZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (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: |
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