参数资料
| 型号： | ISL6753AAZA |
| 厂商： | Intersil |
| 文件页数： | 14/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM/VM 16-QSOP |
| 标准包装： | 98 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 4 |
| 频率 - 最大： | 2MHz |
| 占空比： | 100% |
| 电源电压： | 9 V ~ 16 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： | 无 |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1243 (CN2011-ZH PDF) |
ISL6753
The second power transfer period commences when switch
LL closes. With switches UR and LL on, the primary and
RESDEL is set properly, switch LR will be turned on at this
time.
secondary currents flow as indicated below.
VIN+
VIN+
UL
UR
D1
I S
UL
UR
L L
D1
VOUT+
I P
L L
VOUT+
RTN
RTN
LL
LR
LL
LR
D2
D2
VIN-
FIGURE 14. UR - LL POWER TRANSFER
The UR - LL power transfer period terminates when switch
LL turns off as determined by the PWM. The current flowing
in the primary must find an alternate path. The current flows
into the parasitic switch capacitance which charges the node
to VIN and then forward biases the body diode of upper
switch UL. As before, the output inductor current assists in
this transition. The primary leakage inductance, L L ,
maintains the current, which now circulates around the path
of switch UR, the transformer primary, and switch UL. When
switch LL opens, the output inductor current free-wheels
predominantly through diode D1. Diode D2 may actually
conduct very little or none of the free-wheeling current,
depending on circuit parasitics. This condition persists
through the remainder of the half-cycle.
VIN+
VIN-
FIGURE 16. UPPER SWITCH TOGGLE AND RESONANT
TRANSITION
The first power transfer period commences when switch LR
closes and the cycle repeats. The ZVS transition requires
that the leakage inductance has sufficient energy stored to
fully charge the parasitic capacitances. Since the energy
stored is proportional to the square of the current (1/2 L L I P2 ),
the ZVS resonant transition is load dependent. If the leakage
inductance is not able to store sufficient energy for ZVS, a
discrete inductor may be added in series with the
transformer primary.
Fault Conditions
A fault condition occurs if VREF or VDD fall below their
undervoltage lockout (UVLO) thresholds or if the thermal
protection is triggered. When a fault is detected, the soft-
start capacitor is quickly discharged, and the outputs are
disabled low. When the fault condition clears and the soft-
start voltage is below the reset threshold, a soft-start cycle
begins.
UL
LL
I P
UR
LR
L L
D1
D2
I S
VOUT+
RTN
An overcurrent condition is not considered a fault and does
not result in a shutdown.
Thermal Protection
Internal die over temperature protection is provided. An
integrated temperature sensor protects the device should
the junction temperature exceed 140°C. There is
VIN-
FIGURE 15. UR - UL FREE-WHEELING PERIOD
When the upper switches toggle, the primary current that
was flowing through UR must find an alternate path. It
charges/discharges the parasitic capacitance of switches UR
and LR until the body diode of LR is forward biased. If
14
approximately 15°C of hysteresis.
Ground Plane Requirements
Careful layout is essential for satisfactory operation of the
device. A good ground plane must be employed. VDD and
VREF should be bypassed directly to GND with good high
frequency capacitance.
References
[1] Ridley, R., “A New Continuous-Time Model for Current
Mode Control”, IEEE Transactions on Power
Electronics, Vol. 6, No. 2, April 1991.
FN9182.2
April 4, 2006
相关PDF资料 |
PDF描述 |
|---|---|
| ISL6754AAZA | IC REG CTRLR PWM CM/VM 20-QSOP |
| ISL6755AAZA | IC REG CTRLR PWM CM/VM 20-QSOP |
| ISL6845IU-T | IC REG CTRLR BST FLYBK ISO 8MSOP |
| ISL6884IAZ | IC CTRLR CCFL BRIGHTNESS 20-SSOP |
| ISL78010ANZ | IC REG MULTI-OUTP 32-TQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6753AAZA-T | 功能描述:IC REG CTRLR PWM CM/VM 16-QSOP 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) |
| ISL6754AAZA | 功能描述:IC REG CTRLR PWM CM/VM 20-QSOP 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) |
| ISL6754AAZA-T | 功能描述:IC REG CTRLR PWM CM/VM 20-QSOP 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) |
| ISL6754DBEVAL1Z | 功能描述:BOARD DEMO FOR ISL6754 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| ISL6755AAZA | 功能描述:IC REG CTRLR PWM CM/VM 20-QSOP 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) |
发布紧急采购，3分钟左右您将得到回复。