MIC38HC42/3/4/5
Micrel, Inc.
Typical Characteristics
Oscillator Frequency
Configuration
100
OUTPUT DEAD TIME (%)
100
200pF
470pF
1nF
1.8nF
V
DD
= 15V
OSC. DISCHARGE CURRENT (mA)
MIC38C/HC42/43 Output Dead
Time vs. Oscillator Frequency
Oscillator Discharge
Current vs. Temperature
9.0
8.8
8.6
8.4
8.2
8.0
7.8
7.6
7.4
V
DD
= 15V
V
OSC
= 2V
R
T
RESISTANCE (kΩ)
4.7nF
10
10nF
200pF
470pF
1nF
18nF
1
1x10
4
1x10
5
FREQUENCY (Hz)
1x10
6
10
4.7nF
10nF
V
DD
= 15V
1
1x10
4
1x10
5
1x10
6
OSCILLATOR FREQUENCY (Hz)
7.2
7.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
CURRENT SENSE AMP THRESHOLD (V)
1.2
1.0
125°C
0.8
0.6
25°C
0.4
0.2
0.0
-50°C
V
REF
SHORT CURCUIT CURRENT (mA)
Current Sense Amplifier
vs. Error Amplifier Output
Short-Circuit Reference
Current vs. Temperature
120
OUTPUT VOLTAGE (V)
100
80
60
40
20
V
DD
= 15V
25
20
15
10
5
0
-5
-10
-15
0.0
MIC38C4x
Output Waveform
V
D
= 15V
C
L
= 1nF
0.2
0.4
0.6
TIME (µs)
0.8
1.0
0
2
4
6
8
ERROR AMPLIFIER OUTPUT (V)
0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
M9999-042205
6
April 2005
MICREL [ MICREL SEMICONDUCTOR ]
