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PDF M51996FP Data sheet ( Hoja de datos )
| Número de pieza | M51996FP | |
| Descripción | SWITCHING REGULATOR CONTROL | |
| Fabricantes | Mitsubishi | |
| Logotipo |  |
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MITSUBISHI (Dig./Ana. INTERFACE)
M51996AP/FP
DESCRIPTION
M51996A is the primary switching regulator controller which is
especially designed to get the regulated DC voltage from AC power
supply.
This IC can directly drive the MOS-FET with fast rise and fast fall
output pulse and with a large-drive totempole output.
Type M51996A has the functions of not only high frequency OSC
and fast output drive but also current limit with fast response and
high sensibility so the true "fast switching regulator" can be
realized.
The M51996A is equivalent to the M51978 with externally re-
settable OVP(over voltage protection)circuit.
FEATURES
500kHz operation to MOS FET
Output current...............................................................±1A
Output rise time 60ns,fall time 40ns
Modified totempole output method with small through current
Compact and light-weight power supply
•Small start-up current............................................100µA typ.
•Big difference between "start-up voltage" and "stop voltage"
makes the smoothing capacitor of the power input section small.
Start-up threshold 16V,stop voltage 10V
•Packages with high power dissipation are used to with-stand the
heat generated by the gate-drive current of MOS FET.
14-pin DIP,16-pin SOP 1.5W(at 25°C)
Simplified peripheral circuit with protection circuit and built-in
large-capacity totempole output
•High-speed current limiting circuit using pulse-by-pulse
method(CLM+pin)
•Over-voltage protection circuit with an externally re-settable
latch(OVP)
•Protection circuit for output miss action at low supply
voltage(UVLO)
High-performance and highly functional power supply
•Triangular wave oscillator for easy dead time setting
•SOFT start function by expanding period
SWITCHING REGULATOR CONTROL
PIN CONFIGURATION (TOP VIEW)
COLLECTOR
VOUT
EMITTER
OVP
F/B
DET
REG
1
2
3
4
5
6
7
14 Vcc
13 CLM+
12 GND
11 T-OFF
10 CF
9 T-ON
8 SOFT
Outline 14P4
COLLECTOR
VOUT
EMITTER
HEAT SINK PIN
OVP
F/B
DET
REG
1
2
3
4
5
6
7
8
16 Vcc
15 CLM+
14 GND
13 HEAT SINK PIN
12 T-OFF
11 CF
10 T-ON
9 SOFT
Outline 16P2N-A
Connect the heat sink pin to GND.
APPLICATION
Feed forward regulator,fly-back regulator
RECOMMENDED OPERATING CONDITIONS
Supply voltage range............................................12 to 30V
Operating frequency.................................less than 500kHz
Oscillator frequency setting resistance
•T-ON pin resistance RON...........................10k to 75kΩ
•T-OFF pin resistance ROFF..........................2k to 30kΩ
( 1 / 22 )
1 page  
-400
CLM+ TERMINAL CURRENT
VS. CLM+ TERMINAL VOLTAGE
-300
-200
Ta=-30°C
Ta=25°C
Ta=85°C
-100
MITSUBISHI (Dig./Ana. INTERFACE)
M51996AP/FP
SWITCHING REGULATOR CONTROL
REG OUTPUT VOLTAGE
VS. AMBIENT TEMPERATURE
8.5
Rc=∞
Rc=3.6k
Rc=1.5k
8.0
7.5
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
CLM+ TERMINAL VOLTAGE VCLM+(V)
7.0
-60 -40 -20 0 20 40 60 80
AMBIENT TEMPERATURE Ta(°C)
100
OUTPUT HIGH VOLTAGE VS.
SOURCE CURRENT
4.5
4.2
3.9
Vcc=18V
3.6 Ta=25°C
3.3
3.0
2.7
2.4
2.1
1.8
1.5
1.2
10 -3 2 3 5 10 -2 2 3 5 10 -1 2 3 5 10 0 2 3 5 101
SOURCE CURRENT IOH(A)
DETECTION VOLTAGE
VS. AMBIENT TEMPERATURE
2.55
OUTPUT LOW VOLTAGE
VS. SINK CURRENT
5.0
Ta=25°C
4.5
4.0
3.5
3.0
2.5
2.0 Vcc=18V
Vcc=5V
1.5
1.0
0.5
0
10 -3 2 3 5 10 -2 2 3 5 10 -1 2 3 5 10 0 2 3 5 10 1
SINK CURRENT IOL(A)
DETECTION TERMINAL INPUT CURRENT
VS. AMBIENT TEMPERATURE
1.4
1.3
1.2
2.50 1.1
1.0
0.9
2.45
0.8
0.7
2.40
-60 -40 -20 0 20 40 60 80
AMBIENT TEMPERATURE Ta(°C)
0
100 -60 -40 -20 0 20 40 60 80
AMBIENT TEMPERATURE Ta(°C)
( 5 / 22 )
100
5 Page 
(2)Oscillator operation when the SOFT(soft
start) circuit is operating.
Output transistor is protected from rush current by CLM function
at the start time of power on.SOFT terminal is used to improve
the rising response of the output voltage of power
supply(prevention of overshooting).
The ON duration of output is kept constant,and the OFF
duration is extended as the SOFT terminal voltage becomes
lower by the soft start circuit of this IC.
The maximum value of extension is set internally at
approximately sixteen times of the maximum ON duartion.
The features of this method are as follows:
1 It is ideal for primary control as IC driving current is supplied
from the third widing of the main transformer at the start-up
because constant ON duration is obtained from start-up.
2 It is possible to get a wide dynamic range for ON/OFF ratio
by pulse-by-pulse current limit circuit.
3 The response characteristics at power-on is not affected by
input voltage as the pulse-by-pulse limit current value is not
affected by the input voltage.
Fig.6 shows the circuit diagram of the soft start.If SOFT terminal
voltage is low,T-OFF terminal voltage bocomes low and VT-OFF
in equations (3) and (4) become low.
TO REG
TERMINAL
TO REG
TERMINAL
RSOFT
SOFT
TERMINAL
CSOFT
Vz ~4.2V
DISCHARGING TRANSISTOR*
IC's INTERNAL CIRCUIT
*Active when operation stops.
T-OFF
TERMINAL
GND
TERMINAL
Fig.6 Circuit diagram of SOFT terminal section and T-
OFF terminal section
MITSUBISHI (Dig./Ana. INTERFACE)
M51996AP/FP
SWITCHING REGULATOR CONTROL
VOSCH
START FROM 0V
VOSCL
0
VOH
NO OUTPUT
PULSE
VOL
0
THE FIRST
OUTPUT PULSE
t
Fig.8 Relationship between oscillator waveform and
output waveform at start-up
Fig.7 shows the relationship between oscillator waveform and
output pulse.
If the SOFT terminal voltage is VSOFT,the rise rate of CF
terminal given as
~
VT - ON
RON • CF
(V/S) ..............................................................(5)
The fall rate of oscillation waveform is given as
~ VSOFT - VBE
RON • CF
+
VT - ON
16 • RON • CF (V/S) .............................(6)
where
VSOFT;SOFT terminal applied voltage
VBE ~ 0.65V
If VSOFT - VBE < 0, VSOFT - VBE = 0
If VSOFT - VBE > VT - OFF (~3.5V), VSOFT - VBE =VT - OFF
VOSCH
~ 4.4V
VOSCL
~ 2.0V
t
VOH
VOL
t
Fig.7 Oscillator waveform when the SOFT circuit is
operating
PWM comparator, PWM latch and current limit
latch section
Fig.9 shows the scematic diagram of PWM comparator and
PWM latch section. The on-duration of output waveform
coincides with the rising duration of CF terminal waveform,when
the no output current flows from F/B terminal.
When the F/B terminal has finite impedance and current flows
out from F/B terminal,"A" point potential shown in Fig.9 depends
on this current.So the "A" point potential is close to GND level
when the flow-out current becomes large.
"A" point potential is compared with the CF terminal oscillator
waveform and PWM comparator,and the latch circuit is set
when the potential of oscillator waveform is higher than "A"
point potential.
The latch circuit is reset during the dead-time of oscillation
(falling duration of oscillation current).So the "B" point potential
or output waveform of latch circuit is the one shown in Fig.10.
The final output waveform or "C" point potential is got by
combining the "B" point signal and dead-time signal
logically.(please refer to Fig.10)
( 11 / 22 )
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet M51996FP.PDF ] | |
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