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KA384X 数据表(PDF) 4 Page - Estek Electronics Co. Ltd

部件名 KA384X
功能描述  Current Mode PWM Controller
Download  12 Pages
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制造商  ESTEK [Estek Electronics Co. Ltd]
网页  http://www.estek.com.cn/en/index.asp
标志 ESTEK - Estek Electronics Co. Ltd

KA384X 数据表(HTML) 4 Page - Estek Electronics Co. Ltd

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KA384x
www.estek.com.cn
Copyright @ Estek Electronics Co., Ltd
Version 0.2
27 July 2011
4
Electrical Characteristics
(Con.)
(TA=25 °C, VCC=15V, RT=10KΩ, CT=3.3nF, TA=0
oC to +70oC, unless otherwise specified .)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
PWM Section
KA3842 / KA3843
95
97
100
D(Max.)
Max. Duty Cycle
KA3844 / KA3845
47
48
50
D(Min.)
Min. Duty Cycle
-
-
0
%
Total Standby Current
KA3843 / KA3845
-
0.13
0.3
IST
Start-Up Current
KA3842 / KA3844
-
0.2
0.3
ICC(OPR)
Operating Supply Current
Vpin3=Vpin2=0V
-
13
17
mA
VZ
Zener Voltage
ICC=25mA
30
38
-
V
* Adjust VCC above the start threshold before setting it to 15V.
Notes:
Note 1: Parameter measured at trip point of latch with Vpin2=0.
Note 2: Gain defined as A=△Vpin1/△Vpin3; 0≤Vpin3≤0.8V
Note 3: These parameters, although guaranteed, are not 100% tested in production.
Pin Function
Pin
Function
Description
1
COMP
This pin is the Error Amplifier output and is made for loop compensation.
2
VFB
This is the inverting input of the Error Amplifier. It is normally connected to the switching power
supply output through a resistor divider.
3
ISENSE
A voltage proportional to inductor current is connected to this input. The PWM uses this
information to terminate the output switch conduction.
4
RT/CT
The oscillator frequency and maximum output duty cycle are programmed by connecting resistor
RT to VREF and capacitor CT to ground.
5
GND
This pin is the combined control circuitry and power ground.
6
OUT
This output directly drivers the gate of a power MOSFET. Peak currents up to 1A are soured and
sink by this pin.
7
VCC
This pin is the positive supply of the integrated circuit.
8
VREF
This is the reference output. It provides charging current for capacitor CT through resistor RT.
ET-


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