MIC5021BN 반도체 회로 부품 판매점
High-Speed High-Side MOSFET Driver
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 Micrel Semiconductor |
MIC5021
Micrel
MIC5021
High-Speed High-Side MOSFET Driver
General Description
The MIC5021 high-side MOSFET driver is designed to oper-
ate at frequencies up to 100kHz (5kHz PWM for 2% to 100%
duty cycle) and is an ideal choice for high speed applications
such as motor control, SMPS (switch mode power supplies),
and applications using IGBTs. The MIC5021 can also
operate as a circuit breaker with or without automatic retry.
A rising or falling edge on the input results in a current source
pulse or sink pulse on the gate output. This output current
pulse can turn on a 2000pF MOSFET in approximately
550ns. The MIC5021 then supplies a limited current (< 2mA),
if necessary, to maintain the output state.
An overcurrent comparator with a trip voltage of 50mV makes
the MIC5021 ideal for use with a current sensing MOSFET.
An external low value resistor may be used instead of a
sensing MOSFET for more precise overcurrent control. An
optional external capacitor placed from the CT pin to ground
may be used to control the current shutdown duty cycle (dead
time) from 20% to < 1%. A duty cycle from 20% to about 75%
is possible with an optional pull-up resistor from CT to VDD.
The MIC5021 is available in 8-pin SOIC and plastic DIP
packages.
Other members of the MIC502x family include the MIC5020
low-side driver and the MIC5022 half-bridge driver with a
cross-conduction interlock.
Features
• 12V to 36V operation
• 550ns rise/fall time driving 2000pF
• TTL compatible input with internal pull-down resistor
• Overcurrent limit
• Gate to source protection
• Internal charge pump
• 100kHz operation guaranteed over full temperature and
operating voltage range
• Compatible with current sensing MOSFETs
• Current source drive reduces EMI
Applications
• Lamp control
• Heater control
• Motor control
• Solenoid switching
• Switch-mode power supplies
• Circuit breaker
Ordering Information
Part Number
MIC5021BM
MIC5021BN
Temperature Range
–40°C to +85°C
–40°C to +85°C
Package
8-pin SOIC
8-pin Plastic DIP
5
Typical Application
10µF
TTL Input
optional*
+12V to +36V
MIC5021
1
VDD
8
VBOOST
2
Input
7
Gate
3
CT
4
Gnd
Sense
Sense
6
5
N-Channel
Power MOSFET
2.7
nF
RSENSE
RSENSE =
50mV
ITRIP
* increases time before retry
October 1998
High-Side Driver with Overcurrent Trip and Retry
5-169
MIC5021
Pin Configuration
Block Diagram
1 VDD
2 Input
VBOOST 8
Gate 7
3 CT Sense− 6
4 Gnd Sense+ 5
DIP Package
(N)
1 VDD VBOOST 8
2 Input Gate 7
3 CT Sense− 6
4 Gnd Sense+ 5
SOIC Package
(M)
6V Internal Regulator
I1
CINT
2I1
Fault
Normal
Q1
CT
VDD
CHARGE
PUMP
VBOOST
Sense +
Sense –
50mV
Input
Transistor: 106
↑ ONE-
↓ SHOT
10I2
ON
OFF
6V
I2
15V
Gate
Micrel
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
VDD
Input
CT
Gnd
Sense +
Sense –
Gate
VBOOST
Pin Function
Supply: +12V to +36V. Decouple with ≥ 10µF capacitor.
TTL Compatible Input: Logic high turns the external MOSFET on. An
internal pull-down returns an open pin to logic low.
Retry Timing Capacitor: Controls the off time (tG(OFF)) of the overcurrent
retry cycle. (Duty cycle adjustment.)
• Open = approx. 20% duty cycle.
• Capacitor to Ground = approx. 20% to < 1% duty cycle.
• Pull-up resistor = approx. 20% to approx. 75% duty cycle.
• Ground = maintained shutdown upon overcurrent condition.
Circuit Ground
Current Sense Comparator (+) Input: Connect to high side of sense resistor
or current sensing MOSFET sense lead. A built-in offset in conjunction with
RSENSE sets the load overcurrent trip point.
Current Sense Comparator (–) Input: Connect to the low side of the sense
resistor (usually the high side of the load).
Gate Drive: Drives the gate of an external power MOSFET. Also limits VGS
to 15V max. to prevent Gate-to-Source damage. Will sink and source
current.
Charge Pump Boost Capacitor: A bootstrap capacitor from VBOOST to the
FET source pin supplies charge to quickly enhance the Gate output during
turn-on.
5-170
October 1998
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MIC5021BN mosfet
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관련 데이터시트
MIC5021BM
High-Speed High-Side MOSFET Driver - Micrel Semiconductor
MIC5021BN
High-Speed High-Side MOSFET Driver - Micrel Semiconductor