MIC5011BM Micrel Inc, MIC5011BM Datasheet - Page 9

• Manufacturer Part Number: MIC5011BM
• Description: IC DRIVER MIN PARTS HI/LO 8SOIC
• Manufacturer: Micrel Inc

Specifications of MIC5011BM

• Configuration: High or Low Side
• Input Type: Non-Inverting
• Delay Time: 25µs
• Number Of Configurations: 1
• Number Of Outputs: 1
• Voltage - Supply: 4.75 V ~ 32 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Peak: -
• High Side Voltage - Max (bootstrap): -

MIC5011
Applications Information
diode limits the supply to 18V. When the MIC5011 is off,
power is supplied by a diode connected to a 15V supply. The
circuit of Figure 5 is put to good use as a barrier between
low voltage control circuitry and the 90V motor supply.
Half-Bridge Motor Driver (Figure 8). Closed loop control
of motor speed requires a half-bridge driver. This topology
presents an extra challenge since the two output devices
should not cross conduct (shoot-through) when switching.
July 2005
15Vp-p, 20kHz
Squarewave
INPUT
PWM
10mA
Control Input
100nF
200V
15V
22kΩ
1N4003 (2)
2N3904
1N4148
22kΩ
1N4003
100kΩ
4N35
(Continued)
220pF
1nF
15V
10kΩ
33pF
100kΩ
1kΩ
Figure 7. High-Voltage
Figure 8. Half-Bridge
1
2
3
4
Bootstrapped Driver
V+
Source
Gnd
Input
MIC5011
1
2
3
4
Motor Driver
MPSA05
33kΩ
V+
Input
Source
Gnd
+
MIC5011
10µF
Gate
Com
9
C2
C1
Cross conduction increases output device power dissipa-
tion. Speed is also important, since PWM control requires
the outputs to switch in the 2 to 20kHz range.
The circuit of Figure 8 utilizes fast configurations for both
the top- and bottom-side drivers. Delay networks at each
input provide a 2 to 3µs dead time effectively eliminating
cross conduction. Two of these circuits can be connected
together to form an H-bridge for locked antiphase or sign/
magnitude control.
Gate
Com
8
7
6
5
1
2
3
4
C2
C1
100nF
V+
Input
Source
Gnd
MIC5011
8
7
6
5
1N5817
Gate
Com
C2
C1
8
7
6
5
+
1µF
1N4746
5BPB56HAA100
15V
1nF
1N4001 (2)
IRF541
IRF541
1/4 HP, 90V
M
+
( GE )
12V,
10A Stalled
100µF
90V
M
IRFP250
Micrel, Inc.
MIC5011