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參數(shù)資料
| 型號： | ISL6315 |
| 廠商： | Intersil Corporation |
| 英文描述： | Two-Phase Multiphase Buck PWM Controller with Integrated MOSFET Drivers(帶集成MOSFET驅(qū)動器的雙相降壓PWM控制器) |
| 中文描述： | 兩相多相降壓PWM控制器，具有集成MOSFET驅(qū)動器（帶集成MOSFET的驅(qū)動器的雙相降壓的PWM控制器） |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 394K |
| 代理商： | ISL6315 |
13
FN9222.1
July 18, 2007
In summary, for the ISL6315 to operate, the following
conditions need be met: VCC and PVCC must be greater
than their respective POR thresholds, the voltage at ENLL
must be greater than 0.61V, and VID has to be different than
‘11111’. Once all these conditions are met, the controller
immediately initiates a soft start sequence.
SOFT-START
The soft-start function allows the converter to bring up the
output voltage in a controlled fashion, resulting in a linear
ramp-up. Following a delay of 16 PHASE clock cycles (about
70
μ
s) between enabling the chip and the start of the ramp,
the output voltage progresses at a fixed rate of 12.5mV per
16 PHASE clock cycles.
Thus, the soft-start period (not including the 70
μ
s wait) up to
a given voltage, V
DAC
, can be approximated by the following
equation
where V
DAC
is the DAC-set VID voltage, and f
S
is the
switching frequency (typically 222kHz).
The ISL6315 also has the ability to start up into a pre-charged
output, without causing any unnecessary disturbance. The FB
pin is monitored during soft-start, and should it be higher than
the equivalent internal ramping reference voltage, the output
drives hold both MOSFETs off. Once the internal ramping
reference exceeds the FB pin potential, the output drives are
enabled, allowing the output to ramp from the pre-charged
level to the final level dictated by the DAC setting. Should the
output be pre-charged to a level exceeding the DAC setting,
the output drives are enabled at the end of the soft-start
period, leading to an abrupt correction in the output voltage
down to the DAC-set level.
FREQUENCY COMPENSATION
The ISL6315 multiphase converter behaves in a similar
manner to a voltage-mode controller. This section highlights
the design consideration for a voltage-mode controller requiring
external compensation. To address a broad range of
applications, a type-3 feedback network is recommended.
Figure 8 highlights the voltage-mode control loop for a
synchronous-rectified buck converter, applicable, with a small
number of adjustments, to the multiphase ISL6315 circuit. The
output voltage (V
OUT
) is regulated to the reference voltage,
VREF, level. The error amplifier output (COMP pin voltage) is
compared with the oscillator (OSC) modified saw-tooth wave to
provide a pulse-width modulated wave with an amplitude of V
IN
at the PHASE node. The PWM wave is smoothed by the output
filter (L and C). The output filter capacitor bank’s equivalent
series resistance is represented by the series resistor E.
The modulator transfer function is the small-signal transfer
function of V
OUT
/V
COMP
. This function is dominated by a DC
gain, given by d
MAX
V
IN
/V
OSC
, and shaped by the output
filter, with a double pole break frequency at F
LC
and a zero at
F
CE
. For the purpose of this analysis, L and D represent the
individual channel inductance and its DCR divided by 2
(equivalent parallel value of the two output inductors), while C
T
SS
V
1280
S
---------------------------------
=
(EQ. 7)
FIGURE 7. SOFT-START WAVEFORMS FOR ISL6315-BASED
MULTIPHASE CONVERTER
ENLL (5V/DIV)
V
OUT
(0.5V/DIV)
GND>
T1
GND>
T2
T3
OUTPUT PRECHARGED
BELOW DAC LEVEL
OUTPUT PRECHARGED
ABOVE DAC LEVEL
FIGURE 8. VOLTAGE-MODE BUCK CONVERTER
COMPENSATION DESIGN
-
+
E/A
VREF
COMP
C1
R2
R1
FB
C2
R3
C3
L
C
V
IN
PWM
CIRCUIT
HALF-BRIDGE
DRIVE
OSCILLATOR
E
EXTERNAL CIRCUIT
ISL6315
V
OUT
V
OSC
D
UGATE
PHASE
LGATE
ISL6315
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| ISL6315CRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN 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) |
| ISL6315CRZ-TK | 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN 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) |
| ISL6315IRZ | 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN 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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