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参数资料
| 型号： | ISL6219ACA-T |
| 厂商： | Intersil |
| 文件页数： | 9/17页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 28-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 3 |
| 频率 - 最大： | 1.5MHz |
| 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： | -10°C ~ 85°C |
| 封装/外壳： | 28-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
ISL6219A
V COMP
+
-
+
-
PWM1
OUTPUT CURRENT, 20A/DIV
f(j ω )
SAWTOOTH SIGNAL
I ER
I 3
0A
+
-
I AVG
÷ N
Σ
I 2
OUTPUT VOLTAGE,
500mV/DIV
I 1
FIGURE 5. CHANNEL-1 PWM FUNCTION AND CURRENT-
BALANCE ADJUSTMENT
0V
5ms/DIV
In some circumstances, it may be necessary to deliberately
design some channel-current unbalance into the system. In
a highly compact design, one or two channels may be able
to cool more effectively than the other(s) due to nearby air
flow or heat sinking components. The other channel(s) may
have more difficulty cooling with comparatively less air flow
and heat sinking. The hotter channels may also be located
close to other heat-generating components tending to drive
their temperature even higher. In these cases, a proper
selection of the current sense resistors (R ISEN in Figure 4)
introduces channel current unbalance into the system.
FIGURE 6. OVERCURRENT BEHAVIOR IN HICCUP MODE
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 error amplifier. Intersil
specifies the guaranteed tolerance of the ISL6219A to
include all variations in the amplifiers and reference so that
the output voltage remains within the specified system
tolerance.
Increasing the value of R ISEN in the cooler channels and
EXTERNAL CIRCUIT
ISL6219A INTERNAL CIRCUIT
decreasing it in the hotter channels moves all channels into
thermal balance at the expense of current balance.
OVERCURRENT PROTECTION
R C
C C
COMP
ERROR AMPLIFIER
The average current, I AVG in Figure 5, is continually
compared with a constant 75 μ A reference current. If the
average current at any time exceeds the reference current,
the comparator triggers the converter to shut down. All PWM
signals are placed in a high-impedance state which signals
R FB
+
V DROOP
-
FB
I AVG
-
+ V COMP
REFERENCE
VOLTAGE(V DAC )
the drivers to turn off both upper and lower MOSFETs. The
system remains in this state while the controller counts 2048
phase-clock cycles.
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 ISL6219A
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 ISL6219A 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 20mA 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.
9
VSEN
V OUT
FIGURE 7. OUTPUT-VOLTAGE AND LOAD-LINE
REGULATION
FN9093.1
March 20, 2007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6219ACAZ | 功能描述:IC REG CTRLR BUCK PWM VM 28-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ISL6219ACAZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 28-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ISL6219CA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ISL6219CA-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6220DWF2E WAF | 制造商:Harris Corporation 功能描述: |
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