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參數(shù)資料
| 型號： | PJ494CD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.25 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | DIP-16 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 688K |
| 代理商： | PJ494CD |
PJ494
Switchmode Pulse Width Modulation Control Circuit
3-11
2002/11.rev.A
DEAD-TIME CONTROL SECTIONDead-time control-section (See Figure 11)
Value
Parameter
Test Conditions
Min
Typ*
Max
Unit
Input bias current (pin 4)
VI=0 to 5.25V
--
-2.0
-10
A
Maximum duty cycle, each output
VI(pin 4)=0,CT=0.1F,RT=12K
--
45
50
%
Zero duty cycle
--
3.0
3.3
Input threshold voltage(pin 4)
Maximum duty cycle
0
--
V
PWM COMPARATOR SECTION (See Figure11)
Value
Parameter
Test Conditions
Min
Typ*
Max
Unit
Input threshold voltage (pin 3)
Zero duty cycle
--
4.0
4.5
V
Input sink current (pin 3)
V(pin 3)=0.7V
0.3
0.7
--
mA
TOTAL DEVICE
Value
Parameter
Test Conditions
Min
Typ*
Max
Unit
Vcc=15V
--
6.0
10
Standby supply current
Pin 6 at Vref, all other inputs and
outputs open
Vcc=40V
--
9.0
15
Average supply current
VI(PIN4)=2V, See Figure 1
--
7.5
--
mA
SWITCHING CHARACTERISTICS, TA=25℃
Value
Parameter
Test Conditions
Min
Typ*
Max
Unit
Output voltage rise time
--
100
200
Output voltage fall time
Common-emitter configuration,
See Figure 3
--
25
100
Output voltage rise time
--
100
200
Output voltage fall time
Emitter-follower configuration,
See Figure 4
--
40
100
ns
UNDERVOLTAGE LOCKOUT SECTION
Value
Parameter
Test Conditions
Min
Typ*
Max
Unit
Turn-on Threshold
Vcc increasing Iref =1.0mA
5.5
6.43
7.0
V
All typical value except for temperature coefficient are at TA=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
Standard deviation is a measure of the statistical distribution about the mean as derived from the formula
2
1
2
1
)
(
=
∑
=
N
n
N
x
σ
Temperature coefficient of timing capacitor and timing resistor not taken into account
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