参数资料
型号: ISL78215AUZ
厂商: Intersil
文件页数: 8/11页
文件大小: 0K
描述: IC REG CTRLR BST FLYBK ISO 8MSOP
标准包装: 980
PWM 型: 电流模式
输出数: 1
频率 - 最大: 2MHz
占空比: 48%
电源电压: 7.5 V ~ 18 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 105°C
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
包装: 管件
ISL78215
Typical Performance Curves
1.02
1.01
1.001
1.000
0.999
1.00
0.998
0.99
0.997
0.98
0.996
0.97
-40
-10
20
50
80
110
0.995
-40 -25 -10
5
20
35
50
65
80
95 110
TEMPERATURE (°C)
FIGURE 1. FREQUENCY vs TEMPERATURE
1.002
1.000
TEMPERATURE (°C)
FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE
10 3
100pF
0.998
0.996
100
10
220pF
330pF
470pF
1.0nF
2.2nF
3.3nF
4.7nF
0.994
-40 -25 -10
5 20 35 50 65
80
95 110
1
10
20
30
40
50
60
70
80
90 100
TEMPERATURE (°C)
FIGURE 3. EA REFERENCE vs TEMPERATURE
Functional Description
Features
The ISL78215 current mode PWMs make an ideal choice for low-
cost flyback and forward topology applications. With its greatly
improved performance over industry standard parts, it is the
obvious choice for new designs or existing designs which require
updating.
Oscillator
The ISL78215 controllers have a sawtooth oscillator with a
RT (k Ω )
FIGURE 4. RESISTANCE FOR CT CAPACITOR VALUES GIVEN
Soft-Start Operation
Soft-start must be implemented externally. One method,
illustrated in Figure 5, clamps the voltage on COMP.
VREF
COMP
GND
programmable frequency range to 2MHz, which can be
programmed with a resistor from VREF and a capacitor to GND
on the RTCT pin. (Please refer to Figure 4 for the resistor and
capacitance required for a given frequency.)
FIGURE 5. SOFT-START
8
FN7673.1
December 7, 2013
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