参数资料
| 型号： | ISL6740AIVZA |
| 厂商： | Intersil |
| 文件页数： | 13/14页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM VM 16-TSSOP |
| 标准包装： | 960 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 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-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
ISL6740A
10 ? ( R1 – R2 ) – R1 ? R2
R3 = ---------------------------------------------------------------------- Ω (EQ. 13)
Fault Conditions
A fault condition occurs if any of the following conditions
occur:
? V REF falls below 4.65V
? UV falls below 1.00V
? the internal thermal protection triggers
? OTS faults
When any of the above faults are detected, OUTA and OUTB
outputs are disabled, Fault is asserted, and the soft-start
capacitor is quickly discharged. When the fault condition
clears and the soft-start voltage is below the reset threshold, a
soft-start cycle begins. Fault is high impedance during the
soft-start cycle unless an active fault is present.
A shutdown resulting from an overcurrent or short circuit
condition also causes assertion of Fault, but the soft-start
capacitor is not quickly discharged. The initiation of a new
soft-start cycle is delayed while the soft-start capacitor is
discharged at a 15μA rate. This reduces the repetition rate of
the hiccup behavior and keeps the average output current to a
minimum.
Thermal Protection
The second method uses an internal comparator with a 2.5V
reference (V REF /2). The non-inverting input to the comparator
is accessible through the OTS pin. A thermistor or thermal
sensor located at or near the area of interest may be
connected to this input. There is a nominal 25 μ A switched
current source used to create hysteresis. The current source is
active only during an OT fault; otherwise, it is inactive and does
not affect the node voltage. The magnitude of the hysteresis is
a function of the external resistor divider impedance. Either a
positive temperature coefficient (PTC) or a negative
temperature coefficient (NTC) thermistor may be used. If a NTC
thermistor is desired, position R1 may be substituted. If a PTC
is desired, then position R2 may be substituted. The threshold
with increasing temperature is set by making the fixed
resistance equal in value to the thermistor resistance at the
desired trip temperature.
V TH ↑ = 2.5V and R1 = R2 (HOT)
To determine the value of the hysteresis resistor, R3, select the
value of thermistor resistance that corresponds to the desired
reset temperature.
5
R1 + R2
If the hysteresis resistor, R3, is not desired, the value of the
Ω
( NTC )
2.5 ? R2
R1 = -----------------------------------------
? R2
2.5 – 10
Two methods of over temperature protection are provided. The
first method is an on board temperature sensor that protects
the device should the junction temperature exceed 145 ° C.
There is approximately 15 ° C of hysteresis.
V REF
thermistor resistance at the reset temperature can be
determined from:
– 5
(EQ. 14)
2.5 ? R1
R2 = -----------------------------------------
? R1
2.5 + 10
V REF
ON
– 5
Ω
( PTC )
(EQ. 15)
R1
25 μ A
OTHER USES FOR OTS
R2
R3
V REF /2
+
-
The OTS comparator may also be used to monitor signals other
than as suggested above. It may also be used to monitor any
voltage signal for which an excess requires a response as
described above. Input and output voltage monitoring are
examples of this.
Ground Plane Requirements
Careful layout is essential for satisfactory operation of the
FIGURE 11. OTS HYSTERESIS
device. A good ground plane must be employed. V DD and V REF
should be bypassed directly to GND with good high frequency
capacitance.
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
in the quality certifications found at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
13
FN9195.3
February 9, 2012
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| ISL6740AIVZA-T | 功能描述:IC REG CTRLR PWM VM 16-TSSOP 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) |
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