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参数资料
| 型号： | ISL6315CRZ-T |
| 厂商： | Intersil |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-QFN |
| 标准包装： | 6,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 255kHz |
| 占空比： | 67% |
| 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-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
ISL6315
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
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.
C2
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
COMP
R2
C1
R3
C3
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
E/A
+
FB
R1
equation
VREF
T SS = ---------------------------------
V DAC ? 1280
f S
(EQ. 7)
OSCILLATOR
V OUT
where V DAC is the DAC-set VID voltage, and f S is the
V IN
switching frequency (typically 222kHz).
PWM
V OSC
The ISL6315 also has the ability to start up into a pre-charged
output, without causing any unnecessary disturbance. The FB
CIRCUIT
UGATE
L
D
pin is monitored during soft-start, and should it be higher than
HALF-BRIDGE
the equivalent internal ramping reference voltage, the output
DRIVE
PHASE
C
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
LGATE
E
output be pre-charged to a level exceeding the DAC setting,
the output drives are enabled at the end of the soft-start
ISL6315
EXTERNAL CIRCUIT
period, leading to an abrupt correction in the output voltage
down to the DAC-set level.
OUTPUT PRECHARGED
ABOVE DAC LEVEL
OUTPUT PRECHARGED
BELOW DAC LEVEL
FIGURE 8. VOLTAGE-MODE BUCK CONVERTER
COMPENSATION DESIGN
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
GND>
GND>
T1 T2
T3
V OUT (0.5V/DIV)
ENLL (5V/DIV)
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
FIGURE 7. SOFT-START WAVEFORMS FOR ISL6315-BASED
MULTIPHASE CONVERTER
13
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
FN9222.1
July 18, 2007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6315CRZ-TK | 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN 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) |
| ISL6315IRZ | 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN 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) |
| ISL6315IRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN 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) |
| ISL6316CRZ | 功能描述:软开关 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR COM RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| ISL6316CRZ-T | 功能描述:软开关 PWM 控制器 W/ANNEAL ISL6306 4-PHS VR11 CNTRLRCOM RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
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