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PDF R2A20121SP Data sheet ( Hoja de datos )
| Número de pieza | R2A20121SP | |
| Descripción | Synchronous Phase Shift Full-Bridge Control IC | |
| Fabricantes | Renesas Technology | |
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R2A20121SP
Synchronous Phase Shift Full-Bridge Control IC
Features
• High frequency operation; oscillator frequency = 2 MHz Max
• Full-bridge phase-shift switching circuit with adjustable delay times
• Integrated secondary synchronous rectification control with adjustable delay times
• Pulse by pulse current limit
• Package: TSSOP-20
Illustrative Circuit
VIN
DC 5 V DC 5 V
Vbias
(DC 12 V)
DC 5 V
DC 5 V
DC 5 V
REJ03D0914-0100
Rev.1.00
Sep 29, 2008
Vout
+
−
VCC OUT OUT CS RAMP
-A -B
OUT
-C
OUT OUT OUT
-D -E -F
VREF
R2A20121
COMP
FB (−)
DELAY DELAY DELAY
GND RT SYNC SS FB (+) -1 -2 -3
HAT3043C
HAT3042C
HAT3004R
Note: The above circuit is reference example. Please confirm the operation when designing the system.
REJ03D0914-0100 Rev.1.00 Sep 29, 2008
Page 1 of 27
www.DataSheet.in
1 page  
R2A20121SP
Electrical Characteristics
(Ta = 25°C, Vcc = 12 V, RT = 33 kΩ, Rdelay = 51 kΩ, unless otherwise specified.)
Item
Symbol
Min Typ Max Unit
Test Conditions
SUPPLY
Start threshold
VH
7.7 8.4 9.1 V
Shutdown threshold
VL
7.4 8.0 8.6 V
UVLO hysteresis
dVUVL
0.3 0.4 0.5 V
Start-up current
Is
— 90 150 µA Vcc = 7.5 V
Operating current
Icc
— 7 10 mA No load on VREF pin
VREF
Output voltage
Vref
4.9 5.0 5.1 V
Line regulation
Vref-line
— 0 10 mV Vcc = 10 V to 16 V
OSCILLATOR
Load regulation
Temperature stability
Oscillator frequency
Vref-load
dVref/dTa
fosc
— 6 20 mV Iref = –1 mA to –20 mA
— ±80 *1 — ppm/°C Ta = –40 to 105°C
— 960 *1 — kHz
Switching frequency
fsw
412 480 547 kHz Measured on OUT-A, -B
Line stability
Temperature stability
fsw-line
dfsw/dTa
–1.5 0
1.5 % Vcc = 10 V to 16 V
— ±0.1 *1 — %/°C Ta = –40 to 105°C
RT voltage
VRT
2.5 2.7 2.9 V
SYNC
Input threshold
VTH-SYNC
2.5 2.85 3.2
V
Output high
VOH-SYNC 3.5 4.0 — V RSYNC = 33 kΩ to GND
Output low
VOL-SYNC
—
0.05 0.15
V RSYNC = 33kΩ to VREF
Minimum input pulse
TI-MIN
50 — — ns
Output pulse width
TO-SYNC
— 500 — ns
Note: 1. Reference values for design. Not 100% tested in production.
REJ03D0914-0100 Rev.1.00 Sep 29, 2008
Page 5 of 27
www.DataSheet.in
5 Page 
R2A20121SP
Oscillator
The oscillation frequency of the oscillator is set by means of a resistance connected between the RT pin and GND. The
following graph shows the relationship between the external resistance and the oscillation frequency. The typical value
of the oscillation frequency is given by the following equation.
1
fosc = 25 [pF] × RT [Ω] + 150 [ns]
[Hz]
10000
1000
100
fosc vs. RT
R2A20121
SYNC
(2.7 V)
RT
GND
RT
10
10
100
RT (kΩ)
1000
Figure 4
Place the resistor for connection to the RT pin as close to the pin as is possible. Please design the pattern so that the
level of cross-talk from other signals is minimized.
Synchronized Operation
Parallel synchronized operation is possible by connecting the SYNC pins of R2A20121s. In this case, up to four slave
ICs can be connected to one master IC. A value of at least twice the master RT value should be set for the slave IC RT
values.
R2A20121
MASTER
(2.7 V)
RT SYNC
R2A20121
SLAVE
(2.7 V)
SYNC RT
RT GND
GND
2 × RT
R2A20121
SLAVE
(2.7 V)
SYNC RT
Max 4 slaves
GND
2 × RT
Figure 5 Parallel Synchronized Operation
REJ03D0914-0100 Rev.1.00 Sep 29, 2008
Page 11 of 27
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11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet R2A20121SP.PDF ] | |
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