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MIC3832 PDF даташит

Спецификация MIC3832 изготовлена ​​​​«Micrel Semiconductor» и имеет функцию, называемую «(MIC3832 / MIC3833) Current-Fed PWM Controllers».

Детали детали

Номер произв MIC3832
Описание (MIC3832 / MIC3833) Current-Fed PWM Controllers
Производители Micrel Semiconductor
логотип Micrel Semiconductor логотип 

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MIC3832 Даташит, Описание, Даташиты
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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









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MIC3832 Даташит, Описание, Даташиты
MIC3832/3833
Micrel
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
GND
PWM
Q
VDD
5V REF
EA –
EA +
EA OUT
NC
SHDN
MDC/SS
CMR
SYNC
RT
CT
Q
Pin Function
Ground: Use as single-point ground tie point.
PWM Output: Variable duty-cycle totem pole output.
Switch (Output): Totem pole output. Noninverting 50% duty cycle output
(180° out-of-phase with Q with no dead time).
Supply Voltage (Input): Clamped to 22V by internal zener diode.
5V Bandgap Reference (Output)
Inverting Error Amplifier Input
Noninverting Error Amplifier Input
Error Amplifier Output: Connect to the appropriate feedback network to
adjust the open loop gain or frequency response.
No Connection: Do not use—leave open.
Overcurrent Shutdown (Input): >1 V disables outputs, >1.25V initiates soft-
start restart. For cycle-by-cycle current limiting, even in voltage-mode control
applications, connect to current sensor. If current sense is not used, connect
to GND.
Maximum Duty Cycle/Soft Start (Input): Apply a dc voltage to adjust maxi-
mum duty cycle (see chart). Adjust soft start by adding capacitance to
increase turn-on time during initial start up or restart after overcurrent
shutdown.
Current Mode Ramp: Feed point for a sample of inductor current when using
current mode control. For voltage-mode control, connect directly to the CT
pin.
Synchronization (Input): AC coupled input from an external master clock
(reference) signal. If not used, leave unconnected. A high (>1.5V) resets the
CT ramp.
Oscillator Timing Resistor: Connect 4kminimum resistor to GND.
Oscillator Timing Capacitor: Connect capacitor to GND. See “Typical
Characteristics: Discharge Time” graph for capacitor value.
Maximum oscillator frequency =
1
2 × (discharge time)
Switch (Output): Totem pole output. Inverting 50% duty cycle output (180°
out-of-phase with Q with no deadtime).
4-136
April 1998









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MIC3832 Даташит, Описание, Даташиты
MIC3832/3833
Absolute Maximum Ratings (Note 1)
Supply Voltage, VDD (continuous) ................................. 22V
Source/Sink Load Current (peak) .................................... 1A
Maximum Supply (Zener) Current .............................. 50mA
Junction Temperature ............................................... 150°C
Lead Temperature, Soldering ....................... 260°C for 10s
θJAPlastic DIP ....................................................... 130°C/W
Micrel
Operating Ratings
Storage Temperature Range ................... –65°C to +150°C
Operating Temperature Range .................. –40°C to +85°C
Reference Load Current ............................................. 25mA
Supply Voltage (VDD): MIC3832 ....................... 16V to 21V
Supply Voltage (VDD): MIC3833 ...................... 7.6V to 21V
Oscillator Frequency Range ..................... 10kHz to 500kHz
Oscillator Timing Resistor ............................. 3kto 100k
Oscillator Timing Capacitor .............................. 1nF to 10nF
Electrical Characteristics (Notes 2, 3)
TA = –40°C to +85°C, VDD = 15V, f = 52kHz unless otherwise specified.
Parameter
Conditions
Reference Section
Output Voltage
Input Regulation
Output Regulation
Temperature Stability
Io = 1mA, TA = 25°C
VCC = 12V to 20V
IO = 1mA to 20mA
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short Circuit Current
Oscillator Section
f = 10Hz to 10kHz, TA = 25°C
TA = 125°C, 1000hrs.
VREF = 0
Frequency
Voltage Stability
Amplitude (Ct)
Discharge Current
Synchronization
TA = 25°C, RT = 16k, CT = 2.2nF
VCC = 12V to 20V
TA = 25°C
ac coupled
Error Amplifier Section
Input Offset Voltage
Input Bias Current
Input Offset Current
Open Loop Gain
1V < VO < 4V
CMRR
1.5V < VCM < 4.5V
PSRR
12V < VDD < 20V
Output Sink Current
VEA OUT = 1V
Output Source Current
VEA OUT = 4V
Output High Voltage
IEA OUT = –0.5mA
Output Low Voltage
IEA OUT = 1mA
Soft Start/Max Duty Cycle Section
Bias Current
Discharge Current
Duty Cycle Clamp Accuracy
Min Typical Max Units
4.90 5.0 5.10
V
5 20 mV
6 25 mV
–0.2 mV/°C
50 mV
50 µV
5.0 mV
25 60 160 mA
4
47 52 57 kHz
0.5 %
1.7 VP-P
1 2.3 5 mA
1.5 V
–15 ±2
0.6
0.1
60 82
75 95
85 120
1.0 2.5
–0.5 –1.3
4.0 4.9
0.6
15
3.0
1.0
5.0
1.0
mV
µA
µA
dB
dB
dB
mA
mA
V
V
–0.05
13
40 50 60
µA
mA
%
April 1998
4-137










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