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PDF MIC3832 Data sheet ( Hoja de datos )
| Número de pieza | MIC3832 | |
| Descripción | (MIC3832 / MIC3833) Current-Fed PWM Controllers | |
| Fabricantes | Micrel Semiconductor | |
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MIC3832/3833
MIC3832/3833
Micrel
Current-Fed PWM Controllers
Not Recommended for New Designs
General Description
The MIC3832 and MIC3833 are unique PWM controllers
designed for current-fed, multiple-output or push-pull,
switched-mode power supply applications.
The MIC3832/3 features UVLO (undervoltage lockout) with
hysteresis, soft start with a programmable time constant,
cycle-by-cycle current limiting, a PWM latch to prevent mul-
tiple outputs due to noise or ringing, and front-edge blanking.
Current-fed topologies eliminate core saturation problems
caused by shoot through (cross conduction) of push-pull
circuits and reduce stress on the switching transistors.
The MIC3832/3 has one PWM stage capable of operating up
to 500kHz and two output stages, Q and Q, that operate at
one-half of the system frequency at a fixed 50% duty cycle.
The MIC3832 UVLO circuit permits startup when the supply
is above 15.9V and forces shutdown when the supply drops
below 9.8V. The MIC3833 starts up above 8.3V and shuts
down below 7.8V. An internal 22V zener diode provides low
power overvoltage protection.
The three output stages are totem-pole drivers capable of 1A
peak current to external power MOSFETs, BJTs, or IGBTs.
The Q and Q outputs have an intentional 50ns overlap (no
dead time).
Features
• 15.9V startup, up to 21V operation (MIC3832)
8.3V startup, up to 21V operation (MIC3833)
• 9.8V undervoltage lockout (MIC3832)
7.8V undervoltage lockout (MIC3833)
• 0.5mA maximum startup current (40µA typical)
• 17mA typical operating current
• 50ns maximum rise and fall times
• 30kHz to 500kHz RC oscillator
• Voltage or current-mode control
• Cycle-by-cycle current limit
• Soft start function
• 5V 2% reference sources 20mA
• Totem-pole output drive stages
1A peak output drive current
• 22V zener clamp on supply pin
• PWM latch eliminates false outputs from noise or ringing
• Adjustable maximum duty-cycle limit
• 5MHz bandwidth error amplifier
Applications
• High-power, multiple-output, switched-mode
power supplies and dc-to-dc Converters
• Current-fed, push-pull, switched-mode
power supplies or dc-to-dc converters
• Isolated high-voltage supplies
4
Pin Configuration
1 GND
Q 16
2 PWM
3Q
4 VDD
5 5V REF
CT 15
RT 14
SYNC 13
CMR 12
6 EA – MDC/SS 11
7 EA +
SHDN 10
8 EA OUT
NC 9
DIP (N) or Wide SOIC (WM)
Ordering Information
Part Number
MIC3832BN
MIC3832BWM
MIC3833BN
MIC3833BWM
Temperature Range
Package
–40°C to +85°C 16-pin Plastic DIP
–40°C to +85°C 16-pin Wide SOIC
–40°C to +85°C 16-pin Plastic DIP
–40°C to +85°C 16-pin Wide SOIC
April 1998
4-135
1 page  
MIC3832/3833
Typical Characteristics
Reference Voltage vs.
Junction Temperature
5.06
5.04
5.02
5.00
4.98
4.96
4.94
-40 0 40 80 120 160
JUNCTION TEMPERATURE (°C)
1000
100
Oscillator Frequency
vs. Timing Resistance
85pF
Note 4
550pF
1.1nF
2.2nF
10.2nF
10
1 10 100
TIMING RESISTANCE (kΩ)
Voltage-Mode Max. Duty
Cycle vs. MDC Voltage
100
90
80
70
60
50 Note 5
40
30
20
10
0
012345
MDC CONTROL VOLTAGE (V)
Current Sense Threshold
vs. Error Amplifier Output
3
VII = 3
25°C
2 125°C
-55°C
VII = 2
1
VII = 1
0
0123456
ERROR AMP OUTPUT (V)
April 1998
Micrel
MIC3832 Undervoltage
Lockout vs. Junct. Temp.
16.4
16.2 ON
16.0
15.8
15.6
10.0-40
0
40 80 120 160
9.8
9.6
9.4 OFF
9.2
-40 0
40 80 120 160
JUNCTION TEMPERATURE (°C)
Discharge Time vs.
Timing Capacitance
10
25°C
-40°C
125°C
1
0.1
1
2 3 4 5 6 8 10
TIMING CAPACITOR (nF)
Output Saturation Voltage
vs. Output Sink Current
5
4 25°C
3
-55°C
2
125°C
1
0
0 0.2 0.4 0.6 0.8 1
OUTPUT SINK CURRENT (A)
MIC3833 Undervoltage
Lockout vs. Junct. Temp.
9.0
8.5 ON
8.0
OFF
7.5
7.0
-40 0
40 80 120 160
JUNCTION TEMPERATURE (°C)
Oscillator Discharge
Current vs. Junct. Temp.
5
4
3
2
1
0
-40 0 40 80 120 160
JUNCTION TEMPERATURE (°C)
Output Voltage Drop vs.
Output Source Current
5
4
125°C
3
-55°C
2 25°C
1
0
0 0.2 0.4 0.6 0.8 1
OUTPUT SOURCE CURRENT (A)
Error Amplifier Open-Loop
Frequency Response
100 45
AMPLITUDE
75
0
50 -45
25
PHASE
0
-90
-135
-25 -180
FREQUENCY (Hz)
4-139
Note 4:
Note 5:
CMR (pin 12) connected to CT
(pin 15).
CMR (pin 12) connected to CT
(pin 15). MDC voltage measured
at MDC/SS (pin 11).
CT = 1nF, RT = 10kΩ.
4
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MIC3832.PDF ] | |
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