CP494 Datasheet, PDF (2/11 Pages) Ceramate Technical – SWITCHMODE Pulse Width Modulation Control Circuit

CP494
SWITCHMODE Pulse Width Modulation Control Circuit
RECOMMENDED OPERATING CONDITIONS
Characteristics
Power Supply Voltage
Collector Output Voltage
Collector Output Current (Each transistor)
Amplified Input Voltage
Current Into Feedback Terminal
Reference Output Current
Timing Resistor
Timing Capacitor
Oscillator Frequency
Symbol
V_CC
V_C1, V_C2
I_C1, I_C2
V_in
l_fb
l_ref
R_T
C_T
f_osc
Min
7.0
–
–
–0.3
–
–
1.8
0.0047
1.0
Typ
15
30
–
–
–
–
30
0.001
40
Max
Unit
40
V
40
V
200
mA
V_CC – 2.0
V
0.3
mA
10
mA
500
kW
10
mF
200
kHz
ELECTRICAL CHARACTERISTICS (V_CC = 15 V, C_T = 0.01 mF, R_T = 12 kW, unless otherwise noted.)
For typical values T_A = 25°C, for min/max values T_A is the operating ambient temperature range that applies, unless otherwise noted.
Characteristics
Symbol
Min
Typ
Max
Unit
REFERENCE SECTION
Reference Voltage (I_O = 1.0 mA)
Line Regulation (V_CC = 7.0 V to 40 V)
Load Regulation (I_O = 1.0 mA to 10 mA)
Short Circuit Output Current (V_ref = 0 V)
OUTPUT SECTION
Collector Off–State Current
(V_CC = 40 V, V_CE = 40 V)
Emitter Off–State Current
V_CC = 40 V, V_C = 40 V, V_E = 0 V)
Collector–Emitter Saturation Voltage (Note 2)
Common–Emitter (V_E = 0 V, I_C = 200 mA)
Emitter–Follower (V_C = 15 V, I_E = –200 mA)
Output Control Pin Current
Low State (V_OC v 0.4 V)
High State (V_OC = V_ref)
Output Voltage Rise Time
Common–Emitter (See Figure 12)
Emitter–Follower (See Figure 13)
V_ref
4.75
5.0
5.25
V
Reg_line
–
2.0
25
mV
Reg_load
–
3.0
15
mV
I_SC
15
35
75
mA
I_C(off)
I_E(off)
V_sat(C)
V_sat(E)
I_OCL
I_OCH
t_r
–
2.0
100
mA
–
–
–100
mA
V
–
1.1
1.3
–
1.5
2.5
–
10
–
mA
–
0.2
3.5
mA
ns
–
100
200
–
100
200
Output Voltage Fall Time
Common–Emitter (See Figure 12)
Emitter–Follower (See Figure 13)
t_f
ns
–
25
100
–
40
100
2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
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Http: www.ceramate.com.tw
Rev 1.0 Apr.19,2004