KA7500 [ESTEK]
single monolithic chip; 单芯片
| 型号： | KA7500 |
| 厂家： | 
Estek Electronics Co. Ltd |
| 描述： | single monolithic chip |
| 文件： | 总6页 (文件大小：630K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
KA
7500
Description
The KA7500 incorporate on a single monolithic chip all the functions required in the construction of a pulse-width-modulation control
circuit. Designed primarily for power supply control ,these devices offer the systems engineer the flexibility to tailor the power
supply control circuitry to hos application. The K A7500 contains an error amplifier , anon-chip adjustable oscillator ,a dead- time
control comparator ,pulse-steering control flip-flop ,a 5-volt, 1% precision regulator , and output-control circuits. The error amplifier
exhibits a common-mode voltage range from -0.3 volts to Vcc -2 volts .The dead time control comparator has a fixed offset that
)
provides approximately 5% deed time when externally altered. The on-chip oscillator may be bypassed by terminating RT (pin 6
to the reference output and providing a sawtooth input to Ct (pin 5) ,or it may be used to drive the common circuits in
synchronous multiple-rail power supplies . Theuncommitted output transistors provide either common circuits in synchronous
Power supplier.The uncommitted output transistors provide either common-emitter or emitter-follower output capability .Each device
provides for push-pull or single-ended output operation, which may be selected through the outpu t - control function . Th
e architecture of these devices prohibits the possibility of either output being pulsed twice during push-pull operation.
Features
•
Complete PWM Power Control Circuitry
Uncommitted Outputs for 200 mA sink or Source Current
Output control Selects Singel-Ended or Push-Pull operation
Internal Circuitry Prohibits Double Pulse at Either output
Variable Dead-Time Provides Control over Total Range Internal
Regulator Provides a Stable 5-V Reference supply ,1% Circuit
Architecture Allows Easy Synchronization
•
•
DIP - 16
Block Digram
Package
BEIJING ESTEK ELECTRONICS CO.,LTD
1
KA
7500
Absolute Maximum Ratings
Over Operating Free-air Temerature Range (Unless Otherwise
Rating
Value
41
Unit
V
Supply voltage ,Vcc
Amplifier input voltage
Vcc+0.3
41
Collector output voltage
Collector output current
250
mA
Operating free-air temperature range
Storage temperature range
Lead temperature 1,6 mm from case for 10 seconds
0 to 70
-65 to 150
260
°C
Recommended Operating Conditions
Parameter
Value
Unit
V
MIN
7
MAX
Supply voltage ,Vcc
40
Vcc-2
40
Amplifier input voltage ,Vi
Collector output voltage ,Vo
Collector output current (each transistor)
Current into feedback terminal
Timing capacitor ,CT
-0.3
200
0.3
mA
0.0047
10
µF
kΩ
Timing resistor ,RT
1.8
1
500
200
70
Oscillator frequency
kHz
Operating free-air temperature ,TA
0
°C
Electrical Characteristics
Over Operating Free-air Temerature Range,Vcc=15V,f=10kHz (Unless Otherwise
Noted)
Parameter
Test conditions
Value
Unit
MIN
4.9
TYP**
MAX
5.1
Output voltage(Vref)
Io=1mA
5
5
V
Io=1mA,TA=25
°
C****
4.95
5.05
25
Line regulation
Vcc=7V to 40V
Io=1Ma to 10mA
Vref=0
2
mV
mA
Load regulation
1
15
Short-circuit output current***
10
35
50
BEIJING ESTEK ELECTRONICS CO.,LTD
2
KA
7500
Oscillator section (See Figure 1)
Parameter
Test conditions*
Value
Unit
MIN
9.2
TYP**
MAX
10.8
12
Frequency
CT
CT
CT
=0.01µF,R
=0.01µF,R
=0.01µF,R
T
T
T
=12KΩ,T
=12KΩ
=12KΩ
A=25
°
C
10
-
kHz
Frequency
9.0
2
Frequency change with temperature *****
ΔTA=MIN TO MAX
Amplifier section (See Figure 2)
Parameter
Test conditions
Value
Unit
MIN
TYP*
2
MAX
10
Input offset voltage
Vo(pin 3)=2.5V
Vo(pin 3)=2.5V
Vo(pin 3)=2.5V
Vcc=7V to 40V
ΔVo=3V,RL=2KΩ,
mV
nA
µA
V
Input offset current
25
250
1
Input blas current
0.2
Common-mode input voltage range
Open-loop voltage amplification
Unity-gain bandwidth
-0.3 to Vcc-2
70
95
dB
kHz
650
Output Section
Parameter
Test conditions
Value
Unit
MIN
TYP**
MAX
Collector off-state current
Emitter off-state current
VCE=40V,Ccc=40V
Vcc=Vc=40V,VE=0
VE=0,Ic=200mA
VC=15V,IE=-200mA
VI=Vref
2
100
-100
1.3
µA
V
Collector-emitter saturation voltage
Common-emitter
Emitter-follower
1.1
1.5
2.5
Output control input current
3.5
mA
Dead -Time Control - Section(See Figure
Parameter
Test conditions
Value
TYP**
-2
Unit
MIN
MAX
Input bias current (pin 4)
VI=0 to 5.25V
-10
µA
%
Maximum duty cycle, each output
Input threshold voltage (pin 4)
VI(pin 4)=0,O.C.=Vref
Zero duty cycle
45
0
3
3.3
V
Maximum duty cycle
P M Comparator Section(See Figure 1)
Parameter
Test conditions
Value
TYP**
4
Unit
MIN
0.3
MAX
4.5
Input threshold voltage(pin 3)
Input sink current (pin 3)
Zero duty cycle
V(pin 3)=0.7V
V
0.7
mA
BEIJING ESTEK ELECTRONICS CO.,LTD
3
KA
7500
Total Device
Parameter
Test conditions
Value
Unit
MIN
MIN
TYP**
MAX
10
Standby supply current
Pin 6 at Vref
Vcc=15V
6
mA
25oC
Switching Characteristics,
T
Parameter
Test conditions
Value
TYP**
100
Unit
MAX
Output voltage rise time
Output voltage fall time
Output voltage rise time
Output voltage fall time
Common-emitter configuration, See figure 3
Emitter-follower configuration. See Figure 4
200
100
200
100
25
ns
100
25
*For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
**All typical values except for parameter changes with temperature are at TA=25
***Duration of the short-circuit should not exceed one second
°C
****This is guaranteed where the marking code on the package surface is
“A”
*****Temperature coefficient of timing capacitor and timing resistor not taken into account.
Parameter Measurement Information
BEIJING ESTEK ELECTRONICS CO.,LTD
4
KA
7500
Figure 1. Operational test circuit and waveforms
Figure 2.Amplifier characteristics
BEIJING ESTEK ELECTRONICS CO.,LTD
5
KA
7500
Figure 3. Common - emitter configuration
Figure 4. Emitter - follower configuration
Ordering Information
ORDERI NG NUM BER
PACKAGE
M AR K ING
KA7500
KA7500
DIP-16
Address :
6A06--6A07
Rm 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing
Postalcode:100039
Tel: 86-010-58895780 / 81 / 82 / 83 / 84
Http://www.estek.com.cn
Fax : 010-58895793
Email:sales@estek.com.cn
REV No:01-060816
BEIJING ESTEK ELECTRONICS CO.,LTD
6
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