参数资料
| 型号： | ISL8121IRZ |
| 厂商： | Intersil |
| 文件页数： | 17/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-QFN |
| 标准包装： | 75 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2MHz |
| 占空比： | 66% |
| 电源电压： | 4.9 V ~ 5.5 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： | 24-VFQFN 裸露焊盘 |
| 包装： | 管件 |
ISL8121
90
DV IN = 1V
7
80
70
60
50
DV IN = 2V
DV IN = 3V
DV IN = 4V
6
5
4
40
3
30
20
10
0
DV IN = 5V
DV IN = 6V
DV IN = 7V
DV IN = 8V
2
1
6
7
8 9
10
11
0
V INmin (V)
6
7
8 9
10
11
FIGURE 18. NORMALIZED MAXIMUM BIAS CURRENT
OBTAINABLE IN PASSIVE
CONFIGURATION vs INPUT VOLTAGE
RANGE CHARACTERISTIC; V VCC = 5V
V INmin (V)
FIGURE 19. NORMALIZED RESISTOR VALUE IN
PASSIVE CONFIGURATION; V VCC = 5V
The maximum bias current, I BIAS , that can be obtained
via the internal shunt regulator and a simple external
resistor is characterized in Figure 18 and can also be
determined using Equation 11:
150
135
120
Δ V IN = 1V
Δ V IN = 2V
Δ V IN = 3V
Δ V IN = 4V
I BIASMAX = I VREGMAX ? --------------------------------------------
V – V
V INMIN – V VCC
INMAX VCC
(EQ. 11)
105
90
75
Δ V IN = 5V
Δ V IN = 6V
Δ V IN = 7V
Δ V IN = 8V
R BIAS = ------------------------------------------
P MAXRBIAS = ( V INMAX – V VCC ) ? I BIAS
To exemplify the use, for an input voltage ranging from
10V to 14V, find the intersection of the Δ V IN = 4V curve
with the V INmin = 10V mark and project the result on the
Y axis to find the maximum bias current obtainable
(approximately 56% of the maximum current obtainable
via the integrated shunt regulator, I VREG_MAX ).
Once the maximum obtainable bias current, I BIAS_MAX ,
is determined, and providing it is greater than the bias
current, I BIAS , required by the circuit, R SHUNT can be
determined based on the lowest input voltage, V INMIN :
V INMIN – V VCC (EQ. 12)
I BIAS
Figure 19 helps with a quick resistor selection based on
the previous guidelines presented. Divide the value thus
obtained by the maximum desired bias current, I BIAS , to
obtain the actual resistor value to be used.
Figure 20 details the normalized maximum power
dissipation R BIAS will be subject to in the given
application. To use the graph provided, find the power
dissipation level corresponding to the minimum input
voltage and the input voltage range and multiply it by the
maximum desired bias current to obtain the maximum
power R BIAS will dissipate.
17
60
45
30
15
0
6 7 8 9 10 11
V INmin (V)
FIGURE 20. NORMALIZED RESISTOR POWER
DISSIPATION (AS SELECTED IN FIGURE 17)
vs MINIMUM INPUT VOLTAGE; V VCC = 5V
Alternately, the maximum power dissipation inside R BIAS
can be calculated using Equation 13:
(EQ. 13)
Maximum power dissipation in the bias resistor will take
place at the upper end of the input voltage range. Select
a resistor with a power dissipation rating above the
calculated value and pay attention to design aspects
related to the power dissipation level of this component.
Although Figures 18 through 20 assume a VCC voltage of
5V, the design aid curves can be translated to a different
VCC voltage by translating them in the amount of the
voltage differential, to the left for a lower VCC voltage, or
to the right for a higher VCC voltage,
FN6352.2
October 27, 2009
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相关代理商/技术参数 |
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| ISL8121IRZ-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) |
| ISL8121IRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL8121IRZ-T WITH GOLD BOND WIRE ONLY - Tape and Reel |
| ISL8126 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Dual/n-Phase Buck PWM Controller with Integrated Drivers |
| ISL8126CRZ | 功能描述:IC REG CTRLR BUCK PWM VM 32-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) |
| ISL8126CRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 32-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) |
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