mc44602 ON Semiconductor, mc44602 Datasheet - Page 4

• Manufacturer Part Number: mc44602
• Description: High Performance Current Mode Controller
• Manufacturer: ON Semiconductor

NOTES: 2. Adjust V CC above the startup threshold before setting to 12V.
ELECTRICAL CHARACTERISTICS
values T A = –25 C to +85 C [Note 3] unless otherwise noted.)
OUTPUT SECTION
PWM SECTION
TOTAL DEVICE
OVERLOAD AND SHORT CIRCUIT PROTECTION
Output Voltage (T A = 25 C)
Output Voltage with UVLO Activated (V CC = 6.0 V, I Sink = 1.0 mA)
Output Voltage Rise Time (C L = 1.0 nF, T J = 25 C)
Output Voltage Fall Time (C L = 1.0 nF, T J = 25 C)
Duty Cycle
Foldback Amplifier Threshold (Figures 9,10)
Load Detect Input
4
Power Supply Current
Power Supply Zener Voltage (I CC = 25 mA)
8.0
5.0
3.0
2.0
1.0
0.8
80
50
30
20
10
Low State (I Sink = 100 mA)
Low State
Low State
High State (I Source = 50 mA)
High State
High State
Maximum
Minimum
Startup (V CC = 5 V)
Operating (Note 2)
Valid Load Comparator Threshold (V Pin 2 Increasing)
Demag Comparator Threshold (V Pin 2 Decreasing)
Propagation Delay (Input to Sink or Source Output)
Input Resistance
10 k
T J = 25 C
T A = –25 C to +85 C
Note: Output switches at
one–half the oscillator frequency.
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
V CC = 12 V
T A = 25 C
C T =10 nF
C T =5.0 nF
20 k
(I Source = 0.5 A)
(I Source = 0.75 A)
(I Sink = 1.0A)
(I Sink = 1.5 A)
versus Oscillator Frequency
f OSC , OSCILLATOR FREQUENCY (Hz)
Figure 1. Timing Resistor
C T =2.0 nF
50 k
C T =500 pF
Characteristic
100 k
C T =1.0 nF
(V CC and V C = 12 V [Note 2], R T = 10k, C T = 1.0 nF, for typical values T A = 25 C, for min/max
200 k
C T =200 pF
C T =100 pF
500 k
MC44602
1.0 M
75
70
65
60
55
50
10 k
(V CC –V OH )
V OL(UVLO)
V th(Demag)
t PLH(in/out)
DC (max)
Ä Ä Ä Ä
Ä Ä Ä Ä
Ä Ä Ä Ä
Ä Ä Ä Ä
DC (min)
Symbol
V th(VL)
1. C T = 10 nF
2. C T = 5.0 nF
3. C T = 2.0 nF
4. C T = 1.0 nF
5. C T = 500 pF
6. C T = 100 pF
∆V FB
V OL
I CC
R in
V Z
t r
t f
20 k
Ä Ä
1
f OSC , OSCILLATOR FREQUENCY (Hz)
(V FB –100)
versus Oscillator Frequency
MOTOROLA ANALOG IC DEVICE DATA
Figure 2. Output Deadtime
Min
Ä Ä Ä Ä
2.0
46
10
18
50
12
–
–
–
–
–
–
–
–
–
–
–
–
–
Note: Output switches at
one–half the oscillator
frequency.
50 k
2
(V FB –200) (V FB –300)
100 k
Typ
0.6
1.8
2.1
1.4
1.7
1.8
0.1
0.2
2.5
1.1
50
50
48
17
20
88
18
–
–
Ä Ä
3
200 k
Max
150
150
120
Ä Ä
Ä Ä
0.3
2.0
2.6
1.7
2.0
2.2
1.1
0.5
3.0
1.6
50
20
22
23
30
0
4
Ä Ä
500 k
V CC = 12 V
T A = 25 C
5
Unit
mV
mV
kΩ
mA
µS
ns
ns
%
Ä Ä
V
V
V
V
6
1.0 M