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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
DESCRIPTION
M62212 is designed as a general purpose DC-DC converter. This small 8 pin package contains many functions allowing simpler peripheral circuits and compact set design. The output transistor is open collector and emitter follower type. This makes the control STEP-UP,STEP-DOWN and INVERTING converter.
PIN CONFIGURATION(TOP VIEW)
Collector output 1 Emitter 2 output GND 3 4
8 7 6 5
VCC IN FB DTC
M62212P / FP / GP
FEATURE
* Wide operation power supply voltage range *******2.5 ~ 18V * Low power consumption************************1.3mA typ * High speed switching is possible.(300kHz) * Output short protection circuit and ON/OFF control are used. The dead-time control and the soft-start operation are possible * Package variation : 8pin DIP/SOP/SSOP8
Cosc
OUTLINE 8P2S-A (FP) 8P2X (GP) 8P4 (P)
APPLICATIONS
General electric products, DC-DC converter
BLOCK DIAGRAM
VCC 8
UVLO VTH : 2.3V
Collector output
COSC 4
OSC
VCC
PWM Comp
1
2
Emitter output
OP Amp
IN 7
1.25V VCC 1.86V
Short protection circuit
1.25V
R SQ 1.15V 0.3V
6 FB
5 DTC
3 GND
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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
ABSOLUTE MAXIMUM RATINGS (Ta=25C, unless otherwise noted) Symbols
Vcc Vo Io Pd Ktheta Topr Tstg
Items
Power supply voltage Output voltage Output current Power dissipation Thermal derating ratio Operating ambient temperature Storage temperature
Conditions
Ratings
19 19 150
Units
V V mA mW C C
Ta=25C Ta>25C
625 (P) 360(FP) 250(GP) -20C ~ +85 -40C ~ +125
5.00 (P) 2.88 (FP) 2.00(GP) mW/C
Electrical Characteristics ( Ta=25C, Vcc =12V, Cosc=100pF unless otherwise noted ) Block
All device Std. voltage section
Symbol
VCC I CC ST V REF L INE IB AV
Items
Range of power supply voltage Standby current Standard voltage Line regulation Input bias current Open loop gain Unity gain bandwidth Output high voltage Output low voltage Output sink current Output source current Oscillation frequency
Upper limit voltage of oscillation waveform Lower limit voltage of oscillation waveform
Test condition
Limits
Min 2.5 Typ 1.3 1.19 1.25 5 80 0.6 1.82 6 -60 110 1.0 0.45 -40 10 -30 2.62 400 Max 18 1.8 1.31 12 500
Units
V mA V mV nA dB MHz V mV mA uA kHz V V uA uA
Output "OFF" status
Voltage follower VCC=2.5 ~ 18V
Error amp. section
GB VOM + VOM + I OM I OM -
VFB=1.86V VIN =1V
f OSC
Oscillator section
VOSCH VOSCL I OSC CH I OSC DIS1 VTH ON
Cosc charge current Cosc discharge current 1 Start-up threshold voltage Shut-down threshold voltage Hysteresis
VIN =1V VIN =1V VHYS = VTHON - VTHOFF 20 2.2
2.3 2.25 50
2.4
V V
UVLO section
VTH OFF VHYS
80
mV
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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
Electrical Characteristics ( Ta=25C, Vcc =12V, Cosc=100pF unless otherwise noted ) Block Symbol
VTH FB VTH DTC
Items
FB threshold voltage Latch mode "H" threshold voltage Latch mode "L" threshold voltage DTC charge current when start-up DTC discharge current 1
Test condition
VIN =1V,VDTC=0.7V VIN =1V,VFB =2.11V VIN =1V,VFB =2.11V VDTC=0.7V,VFB =2.11V VDTC=0.7V,VFB =2.11V
Limits
Min Typ
1.86 1.15 0.3 -45 50 -10 15 -1 0.3 1.6 1 1.1
Max
Units
V V V A A A A A V V
Short protection circuit
VTL DTC I CH1 I DIS1 I CH2 I DIS2 I CL
DTC charge current when stable state VDTC=0.7V,VFB = 0.7V DTC discharge current 2
VDTC=0.2V,VFB =2.11V
Output section
Collector output leak current
Collector output saturation voltage 1 Collector output saturation voltage 2
VCE=18V , VCC=18V
Emitter GND, IC=150mA,VE=0V Emitter follower, IE=50mA,VC=12V
VSAT1 VSAT2
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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
1. Application Circuit (STEP-DOWN converter with current buffer transistor)
L
VIN
CIN
8 1
VOUT
D R1 R2
4
COUT
COSC
7 6
M62212
2
5
3
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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
2. FUNCTION DESCRIPION
1) Soft Start (The peripheral circuit is shown in Fig.1) When the power is turned ON, input terminal IN is at 0V level. Therefore, the FB terminal is fixed to High level. The DTC terminal goes up gradually starting from 0V due to the internal charge current and the external CDTC. When the level of DTC terminal reaches the lower limit of the triangular wave of the oscillator, PWM comparator and the output circuit go into operation causing the output voltage, "Vo" of the DC-DC converter to rise. The charge current is designed to be approximately 45A.
FB DTC 1.0V OSC 0.45V
OFF
External Tr collector
ON
Fig.2
2) DTC The dead time control is set by installing a resistor between the DTC terminal and GND. However, the DTC terminal serves as the short protection circuit also. Therefore, its set up depends on whether the short protection circuit is used and not. (When the short protection circuit is used) At this time, the charge current for DTC is approximately 10A . Therefore, RDTC should be set to 40K ~ 110K. (When the short protection circuit is not used) At this time, the charge current for DTC is approximately 45A. Therefore, RDTC is set to 12KA25K.
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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
3) Short Protection Circuit The Short Protection Circuit used the timer latch system. It is determined by setting the capacity used for the soft start connected to the DTC terminal. Fig.3 shows the short protection circuit and the timing chart for various modes. When the power is turned on, the FB terminal goes high (approx. 2.3V) and the DTC terminal goes low (goes up slowly from 0V). Thus, approximately 45A current will flow when SW1:ON and SW2:OFF. The potential, namely the potential of the FB terminal is in the amplitude of the triangular wave, SW1 will be OFF and SW2 will be ON and approximately 50A will flow into the DTC terminal. This discharge current will cause the DTC terminal to drop from 1.15V. At this time, if the potential of the FB terminal goes to the control potential before the potential at the DTC terminal goes lower than 0.45V which is the lower limit value of the triangular wave and if the potential of the FB terminal is lower than the potential of the DTC terminal, then the system is activated. When the output is shorted, the system is either activated or latched depending on whether the time for the high potential of the FB terminal reaches the potential of the control state is long or short. (For detail, see [II] and [IV] of the Mode) There are two ways to go back to operation after the latch to shut off output. Either method can restart with soft start. 1. Turning ON the Vcc. 2. Make the FB terminal to go to the low potential of 1.86V or less. Then, it is cancel led. [Mode Explained] [ I ] Mode ************ Activation This is used when the FB terminal goes down to the control state potential when the DTC terminal is in up slope. In order for the activation to occur when the DTC terminal is in down slope, the FB terminal potential must go below the DTC terminal before the DTC terminal goes to 0.45V. [ II ] Mode ************* Output short --> Activation The system is activated if the FB terminal potential goes below the DTC terminal potential before the DTC terminal goes to 0.45V. If there is not enough time, the output is turned OFF (Latched) [ III ] Mode ************ ON/OFF Control --> Activation This mode turns off the output by forcing the DTC terminal to go down. (The system) returns as in the case of the activation. [ IV ] Mode ************ Output Short (Latch) The output is turned OFF when the FB terminal potential did not go down to the control state before the DTC terminal went down to 0.45V.
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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
Comp1 FB 1.86V (Initial RESET) R Q
1.25V I1 10 SW1 DTC I3 60
Vcc I2 35
S
CDTC
RDTC 90K (900mV) SW2
Comp2 1.15V 0.3V
* SW1 and SW2 are turned ON by "H" signal.
FB
2.0
1.15 1.0
DTC
DTC set up value (Tentative)
OSC 0.45
0 I1 I2 I3 ON ON OFF
45
ON OFF ON
50
ON OFF OFF
Charge 10
ON OFF ON
Discharge
ON OFF OFF
Charge 10
ON ON OFF
45
ON ON OFF
45
ON OFF ON
50
ON OFF OFF
Charge 10
ON OFF ON
ON ON ON
Charge Discharge
Charge Charge Discharge
50
Discharge Discharge 50 15
Activate [I]
Output short
ON/OFF control --> Activate
Output short (Latch) [ IV ]
[ II ]
[ III ]
Fig.3 Short Protection Circuit and the Timing Chart of the Modes
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MITSUBISHI SEMICONDUCTORS
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
3.CONSTANT DEFINITION CONSTANT
TON TOFF TON + TOFF TOFF (MIN) TON (MAX) D (MAX) COSC L (MIN) R1
(*1)
Step-down converter
VO + VF VIN - VCE(sat) - VO 1 fOSC
TON + TOFF TON 1+ TOFF
Step-up converter
VO + VF - VIN VIN - VCE(sat) 1 fOSC
TON + TOFF TON 1+ TOFF
Inverting converter
|Vo| + VF VIN - VCE(sat) 1 fOSC
TON + TOFF TON 1+ TOFF
1 -TOFF fOSC
1 -TOFF fOSC
1 -TOFF fOSC
TON(MAX) TON(MAX) TON(MAX) TON + TOFF TON + TOFF TON + TOFF 1 1 1 -16 * 10 -12 -16 * 10 -12 -16 * 10 -12 3 3 75 * 10 * fosc 75 * 10 * fosc 75 * 10 3 * fosc 2 2 2 2 (VIN - VCE(sat) - VO) * TON(MAX) (VIN -VCE(sat)) * TON(MAX) * fOSC (VIN -VCE(sat)) * TON(MAX) * fOSC 2 * VO * IO 2 * VO * IO IO VO -1 * R2 VREF VDTC(MAX) | ICH1 | VDTC(MAX) | ICH2 | | ICH1 | * tstart VDTC(MAX) IDIS1 * tshort VDTC(MAX) -VOSCL VO -1 * R2 VREF VDTC(MAX) | ICH1 | VDTC(MAX) | ICH2 | | ICH1 | * tstart VDTC(MAX) IDIS1 * tshort VDTC(MAX) -VOSCL |VO| -1 *R2 VREF VDTC(MAX) | ICH1 | VDTC(MAX) | ICH2 | | ICH1 | * tstart VDTC(MAX) IDIS1 * tshort VDTC(MAX) -VOSCL
(*1,*2)
RDTC
(*4)
not use short protection use short protection calicurate from start-up time calicurate from shat down time
CDTC
(*4)
VF : Forward Voltage of outer Diode. VCE(sat) : Saturation Voltage of M62212 or Saturation Voltage of Current buffer Transistor. Ao Please setting the Oscillation frequency first and calicurate each constant value. *1 : Please setting AIo about 1/3 to 1/5 of maximum output current. R1 *2 :|Vo|= (1+ ) * VREF R2 *3 : Please settng R2 about few KE to score of KE because output voltage don't undergo a influence of input current (Terminla 7). *4 : Please setting VDTC(MAX) to satisfy D(MAX), fixed from caracteristics of D(MAX) - VDTC(MAX). ICH1 means DTC charge current when start-up(-45A typ), ICH2 means DTC charge current when stable state(-10A typ), VOSCL means lower limit vlage of oscillation waveform (0.45V typ), and IDIS1 means DTC discharge current 1(50A typ). tstart means time internval when terminal vltage of DTC increase to VOSCL from lower voltage and to start switching at first. tshort means time interval when output is shut down after output is shorted.
(8/8)

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