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参数资料
| 型号： | ISL6525CB |
| 厂商： | Intersil |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 14-SOIC |
| 标准包装： | 50 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 215kHz |
| 占空比： | 100% |
| 电源电压： | 10.8 V ~ 13.2 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： | 14-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
ISL6525
These equations assume linear voltage-current transitions
and do not adequately model power loss due the reverse-
recovery of the lower MOSFETs body diode. The
gate-charge losses are dissipated by the ISL6525 and don't
heat the MOSFETs. However, large gate-charge increases
the switching interval, t SW which increases the upper
MOSFET switching losses. Ensure that both MOSFETs are
within their maximum junction temperature at high ambient
temperature by calculating the temperature rise according to
package thermal-resistance specifications. A separate
power and +12 VDC for the bias, the gate-to-source voltage
of Q1 is 7V. A logic-level MOSFET is a good choice for Q1
and a logic-level MOSFET can be used for Q2 if its absolute
gate-to-source voltage rating exceeds the maximum voltage
applied to PVCC .
+12V
+5V OR LESS
VCC
heatsink may be necessary depending upon MOSFET
power, package type, ambient temperature and air flow.
ISL6525
BOOT
Q1
Standard-gate MOSFETs are normally recommended for
use with the ISL6525. However, logic-level gate MOSFETs
UGATE
PHASE
NOTE:
V G-S ≈ V CC - 5V
can be used under special circumstances. The input voltage,
upper gate drive level, and the MOSFETs absolute gate-to-
PVCC
+5V
OR +12V
source voltage rating determine whether logic-level
MOSFETs are appropriate.
-
+
LGATE
PGND
Q2
D2
NOTE:
V G-S ≈ PVCC
Figure 9 shows the upper gate drive (BOOT pin) supplied by
a bootstrap circuit from V CC . The boot capacitor, C BOOT
develops a floating supply voltage referenced to the PHASE
pin. This supply is refreshed each cycle to a voltage of V CC
less the boot diode drop (V D ) when the lower MOSFET, Q2
turns on. A logic-level MOSFET can only be used for Q1 if
the MOSFETs absolute gate-to-source voltage rating
exceeds the maximum voltage applied to V CC . For Q2, a
logic-level MOSFET can be used if its absolute gate-to-
source voltage rating exceeds the maximum voltage applied
to PVCC.
+12V
D BOOT
GND
FIGURE 10. UPPER GATE DRIVE - DIRECT V CC DRIVE OPTION
Schottky Selection
Rectifier D2 is a clamp that catches the negative inductor
swing during the dead time between turning off the lower
MOSFET and turning on the upper MOSFET. The diode must
be a Schottky type to prevent the lossy parasitic MOSFET
body diode from conducting. It is acceptable to omit the diode
and let the body diode of the lower MOSFET clamp the
negative inductor swing, but efficiency could slightly decrease
VCC
+
V D
-
+5V OR +12V
as a result. The diode's rated reverse breakdown voltage must
be greater than the maximum input voltage.
ISL6525
BOOT
UGATE
PHASE
C BOOT
Q1
NOTE:
V G-S ≈ V CC - V D
ISL6525 DC-DC Converter Application
Circuit
The figure below shows an application circuit of a DC-DC
converter. Detailed information on the circuit, including a
PVCC
+5V
OR +12V
complete Bill-of-Materials and circuit board description, can
be found in application note AN9916.
-
+
LGATE
PGND
Q2
D2
NOTE:
V G-S ≈ PVCC
GND
FIGURE 9. UPPER GATE DRIVE - BOOTSTRAP OPTION
Figure 10 shows the upper gate drive supplied by a direct
connection to V CC . This option should only be used in
converter systems where the main input voltage is +5 VDC
or less. The peak upper gate-to-source voltage is
approximately VCC less the input supply. For +5V main
9
FN4998.3
December 27, 2004
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6525CB-T | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 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:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| ISL6525CBZ | 功能描述:电压模式 PWM 控制器 VTT REG FORVRM 8.5 1 4LD 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 |
| ISL6525CBZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC 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) |
| ISL6526ACB | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 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:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| ISL6526ACB-T | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 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:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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