参数资料
| 型号： | ISL8843ABZ |
| 厂商： | Intersil |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK ISO 8SOIC |
| 标准包装： | 98 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2MHz |
| 占空比： | 100% |
| 电源电压： | 9 V ~ 30 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1244 (CN2011-ZH PDF) |
ISL8843
Typical Performance Curves
1.01
1
0.99
1.001
1.000
0.999
0.998
0.997
0.996
0.98
-60 -40 -20
0
20
40
60
80
100 120 140
0.995
-60 -40 -20
0
20
40
60
80 100 120 140
TEMPERATURE (°C)
FIGURE 1. FREQUENCY vs TEMPERATURE
TEMPERATURE (°C)
FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE
1?10 3
CT =
1.001
1.000
0.998
0.997
100
10
100pF
220pF
330pF
470pF
1.0nF
2.2nF
3.3nF
4.7nF
6.8nF
0.996
-60 -40 -20
0
20
40
60
80 100 120 140
1
1
10
100
TEMPERATURE (°C)
FIGURE 3. EA REFERENCE vs TEMPERATURE
Pin Descriptions
RTCT - This is the oscillator timing control pin. The
operational frequency and maximum duty cycle are set by
connecting a resistor, RT, between VREF and this pin and a
timing capacitor, CT, from this pin to GND. The oscillator
produces a sawtooth waveform with a programmable
frequency range up to 2.0MHz. The charge time, T C , the
discharge time, T D , the switching frequency, f, and the
maximum duty cycle, Dmax, can be approximated from the
following equations:
RT (k ? )
FIGURE 4. RTCT vs FREQUENCY
The formulae have increased error at higher frequencies due
to propagation delays. Figure 4 may be used as a guideline
in selecting the capacitor and resistor values required for a
given frequency.
COMP - COMP is the output of the error amplifier and the
input of the PWM comparator. The control loop frequency
compensation network is connected between the COMP and
FB pins.
FB - The output voltage feedback is connected to the
inverting input of the error amplifier through this pin. The
≈ – RT ? CT ? ln ? ---------------------------------------------- ?
T
T
C
D
≈ 0.533 ? RT ? CT
0.008 ? RT – 3.83
? 0.008 ? RT – 1.71 ?
(EQ. 1)
(EQ. 2)
non-inverting input of the error amplifier is internally tied to a
reference voltage.
CS - This is the current sense input to the PWM comparator.
The range of the input signal is nominally 0 to 1.0V and has
f = 1 ? ( TC + TD )
D = TC ? f
7
(EQ. 3)
(EQ. 4)
an internal offset of 100mV.
GND - GND is the power and small signal reference ground
for all functions.
FN9238.1
January 3, 2006
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL8843ABZ-T | 功能描述:IC REG CTRLR BST FLYBK ISO 8SOIC 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) |
| ISL8843AMBEP | 制造商:Intersil Corporation 功能描述:CURRENT MODE PWM CNTRLR 1A 8SOIC N - Rail/Tube |
| ISL8843AMBEP-TK | 制造商:Intersil Corporation 功能描述:CURRENT MODE PWM CNTRLR 1A 8SOIC N - Tape and Reel |
| ISL8843AMBEPZ | 制造商:Intersil Corporation 功能描述:PB-FREE, -55 TO +125, CURRENT MODE PWM, 100% DC,8.4V UVLO,8L - Rail/Tube |
| ISL8843AMBEPZ-TK | 制造商:Intersil Corporation 功能描述:PB-FREE,-55 TO+125, CURRENT MODE PWM,100% DC,8.4V UVLO,8LD S - Tape and Reel |
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