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参数资料
| 型号： | ISL6406IVZ |
| 厂商： | Intersil |
| 文件页数： | 13/17页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16TSSOP |
| 标准包装： | 960 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 770kHz |
| 占空比： | 100% |
| 电源电压： | 2.97 V ~ 3.63 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： | -40°C ~ 85°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
ISL6406
Given the reduced available gate bias voltage (5V),
logic-level or sub-logic-level transistors should be used for
both N-MOSFETs. Caution should be exercised with devices
The minimum bootstrap capacitance can be calculated by
rearranging Equation 13 and solving for C BOOT using
Equation 14:
C BOOT = -----------------------------------------------------
exhibiting very low V GS(ON) characteristics. The
shoot-through protection present aboard the ISL6406 may
be circumvented by these MOSFETs if they have large
Q GATE
V BOOT1 – V BOOT2
(EQ. 14)
parasitic impedances and/or capacitances that would inhibit
the gate of the MOSFET from being discharged below its
threshold level before the complementary MOSFET is turned
on.
Bootstrap Component Selection
External bootstrap components, a diode and capacitor, are
required to provide sufficient gate enhancement to the upper
MOSFET. The internal MOSFET gate driver is supplied by
the external bootstrap circuitry as shown in Figure 9. The
boot capacitor, C BOOT , develops a floating supply voltage
referenced to the PHASE pin. This supply is refreshed each
cycle, when D BOOT conducts, to a voltage of CPVOUT less
the boot diode drop, V D , plus the voltage rise across
Q LOWER .
CPVOUT
Typical gate charge values for MOSFETs considered in
these types of applications range from 20nC to 100nC.
Since the voltage drop across Q LOWER is negligible,
V BOOT1 is simply V CPVOUT - V D . A Schottky diode is
recommended to minimize the voltage drop across the
bootstrap capacitor during the on-time of the upper
MOSFET. Initial calculations with V BOOT2 no less than 4V
will quickly help narrow the bootstrap capacitor range.
For example, consider an upper MOSFET is chosen with a
maximum gate charge, Q g , of 100nC. Limiting the voltage
drop across the bootstrap capacitor to 1V results in a value
of no less than 0.1μF. The tolerance of the ceramic capacitor
should also be considered when selecting the final bootstrap
capacitance value.
A fast recovery diode is recommended when selecting a
D BOOT
+
V D
V IN
bootstrap diode to reduce the impact of reverse recovery
charge loss. Otherwise, the recovery charge, Q RR , would
ISL6406
BOOT
UGATE
-
C BOOT
Q UPPER
have to be added to the gate charge of the MOSFET and
taken into consideration when calculating the minimum
bootstrap capacitance.
PHASE
NOTE:
V G-S = V CC -V D
-
+
LGATE
Q LOWER
NOTE:
V G-S = V CC
GND
FIGURE 9. UPPER GATE DRIVE BOOTSTRAP
Just after the PWM switching cycle begins and the charge
transfer from the bootstrap capacitor to the gate capacitance
is complete, the voltage on the bootstrap capacitor is at its
lowest point during the switching cycle. The charge lost on
the bootstrap capacitor will be equal to the charge
transferred to the equivalent gate-source capacitance of the
upper MOSFET as shown in Equation 13:
Q GATE = C BOOT × ( V BOOT1 – V BOOT2 )
(EQ. 13)
where Q GATE is the maximum total gate charge of the upper
MOSFET, C BOOT is the bootstrap capacitance, V BOOT1 is
the bootstrap voltage immediately before turn-on, and
V BOOT2 is the bootstrap voltage immediately after turn-on.
The bootstrap capacitor begins its refresh cycle when the gate
drive begins to turn-off the upper MOSFET. A refresh cycle
ends when the upper MOSFET is turned on again, which
varies depending on the switching frequency and duty cycle.
13
FN9073.8
September 4, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6406IVZ-T | 功能描述:电压模式 PWM 控制器 VER OF ISL6406IV-T RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6406MREPZ | 制造商:Intersil Corporation 功能描述:V62/08610-01XE, -55 TO 125C PB-FREE VID VERSION OF THE ISL64 - Rail/Tube |
| ISL6406MREPZ-TK | 制造商:Intersil Corporation 功能描述:V62/08610-01XE, -55 TO 125C PB-FREE VID VERSION OF THE ISL64 - Tape and Reel |
| ISL6406MVEP | 制造商:Intersil Corporation 功能描述:SOFT SW PWM CNTRLR 1-OUT SYNCH BUCK PWM CNTRLR 3.3V/5V 100KH - Rail/Tube |
| ISL6406MVEP-TK | 制造商:Intersil Corporation 功能描述:SOFT SW PWM CNTRLR 1-OUT SYNCH BUCK PWM CNTRLR 3.3V/5V 100KH - Tape and Reel |
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