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參數(shù)資料
| 型號(hào)： | ISL6219A |
| 廠商： | Intersil Corporation |
| 英文描述： | Microprocessor CORE Voltage Regulator Precision Multi-Phase BUCK PWM Controller for Mobile Applications |
| 中文描述： | 微處理器核心電壓調(diào)節(jié)精度多相降壓PWM控制器，用于移動(dòng)應(yīng)用 |
| 文件頁數(shù)： | 9/17頁 |
| 文件大小： | 408K |
| 代理商： | ISL6219A |
9
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.
Increasing the value of R
ISEN
in the cooler channels and
decreasing it in the hotter channels moves all channels into
thermal balance at the expense of current balance.
OVERCURRENT PROTECTION
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
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 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 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 vari-
ations in the amplifiers and reference so that the output volt-
age remains within the specified system tolerance.
FIGURE 5. CHANNEL-1 PWM FUNCTION AND CURRENT-
BALANCE ADJUSTMENT
÷
N
I
AVG
I
3
I
2
Σ
-
+
+
-
+
-
f(j
ω
)
PWM1
I
1
V
COMP
SAWTOOTH SIGNAL
I
ER
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
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(V
DAC
)
EXTERNAL CIRCUIT
ISL6219A INTERNAL CIRCUIT
COMP
C
C
R
C
R
FB
FB
VSEN
-
+
V
DROOP
ERROR AMPLIFIER
V
OUT
V
COMP
ISL6219A
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6219A_07 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Microprocessor CORE Voltage Regulator Precision Multi-Phase BUCK PWM Controller for Mobile Applications |
| ISL6219ACA | 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP 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) |
| ISL6219ACA-T | 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP 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) |
| ISL6219ACAZ | 功能描述:IC REG CTRLR BUCK PWM VM 28-QSOP RoHS:是 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
| ISL6219ACAZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 28-QSOP RoHS:是 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
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