MPS MP3356 High voltage photo flash charger and igbt driver for dsc Datasheet

MP3356
High Voltage Photo Flash Charger
and IGBT Driver for DSC
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP3356 is a fast, highly efficient and
precision high voltage photo-flash charger for
DSC xenon flash.
•
•
•
•
•
The MP3356 has a peak current of 1.5A. A
50V, 0.5Ω internal power switch lowers
transformer turns ratio and switching losses
associated with the primary leakage inductance
and winding capacitance. Integrated secondary
feedback resistors provide +/-2.5% output
voltage charge accuracy. MP3356 also has an
integrated IGBT driver.
Integrated 50V, 0.5Ω Power Switch
1.5A peak current limit
2.5% Charge Accuracy
<1uA Shutdown Current
Integrated IGBT Driver
APPLICATIONS
•
•
Digital Still Cameras
Optical Film Cameras
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks
of Monolithic Power Systems, Inc.
MP3356 is available in the 10-pin, 2X2 flip chip
package.
TYPICAL APPLICATION
VIN
GND
U1
VIN
VIN
SW
AGND
CHAG
EN
PG
PG
MP3356
FB
5, 6, 7, 8
IGBTIN
MP3356 Rev. 0.91
1/29/2010
IGBTOUT
4
1, 2, 3
IGBTIN
PGND
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1
MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC
ORDERING INFORMATION
Part Number*
MP3356DG
Package
10-pin, 2x2 Flip QFN
Top Marking
Free Air Temperature (TA)
4PY
–40°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP3356DG–Z).
For RoHS Compliant Packaging, add suffix –LF (e.g. MP3356DG–LF–Z)
PACKAGE REFERENCE
TOP VIEW
VIN
10
IGBTIN
1
9
VIN
IGBTOUT
2
8
AGND
SW
3
7
PGND
PG
4
6
EN
5
FB
ABSOLUTE MAXIMUM RATINGS (1)
VIN to AGND.......................................-0.3Vto 6V
EN, IGBTIN, IGBTOUT, PG to AGND-0.3Vto 6V
FB to AGND ...................................-60V to 350V
SW to AGND...................................-0.3V to 50V
PGND to AGND ……………………-0.3V to 0.3V
Storage Temperature............... -55°C to +150°C
Continuous Power Dissipation (TA = +25°C) (2)
…………………………………………..…....1.6W
Junction Temperature ............................ +150°C
Lead Temperature (Solder).....................+260°C
Recommended Operating Conditions
(3)
Supply Voltage VIN .............................2.8V to 6V
Operating Junct. Temp (TJ)..... –40°C to +125°C
MP3356 Rev. 0.91
1/29/2010
Thermal Resistance
(4)
θJA
θJC
2x2 Flip Chip ...........................80 ...... 16 ... °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3)
The device is not guaranteed to function outside of its operating
conditions.
4) Measured on JESD51-7, 4-layer PCB.
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MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC
ELECTRICAL CHARACTERISTICS
VIN = VEN = 3.6V, TA = +25°C, unless otherwise noted.
Parameter
Photoflash Capacitor Charger
VIN Voltage Range
VIN UVLO
VIN Quiescent Current
VIN Quiescent Current
Shutdown Current from VIN
VSW Leakage Current
SW ON Resistance between SW
and PGND
EN Input High Voltage
EN Input Low Voltage
Pull-down Resistance of EN pin
IPEAK
Charge completion detect voltage
at FB
FB Resistance
DCM Comparator threshold
PG Leakage Current
PG Output Low Voltage
MAX TON
Thermal Shutdown
IGBT Driver
IGBTOUT pull-up ON resistance
IGBTOUT
pull-down
ON
resistance
IGBTIN Input High Voltage
IGBTIN Input Low Voltage
Propagation delay
IGBTOUT rise time
IGBTOUT fall time
Pull down resistance of IGBTIN
MP3356 Rev. 0.91
1/29/2010
Conditions
Min
Typ
2.8
Rising edge, hysteresis = 200mV
typical
V(EN)=High, V(FB) = 0
V(EN)=High, V(FB) = 336V
V(EN)=Low, VIN =3.6V
VIN=3.6V, VSW=50V, in Shutdown
1
Switch turn-on, ISW=100mA ,VIN=3.6V
Max
Unit
6
V
2.5
V
2
100
1
1
mA
µA
µA
µA
Ω
0.5
2.4
1.2
100
1.5
1.7
V
V
kΩ
A
294
302
310
V
1
kΩ
V
µA
0.6
V(EN)=3.6V
Peak Current Limit
V(FB)=30V
315
5
V(PG)=3.6V
ISINK= 2mA
Maximum TON time
Rising edge, hysteresis = 15oC
70
150
0.1
V
µS
o
C
6
Ω
6
Ω
2.4
IGBTIN
rising/falling
edge
to
IGBTOUT
rising/falling
edge,
Cgate=6800pF
Cgate=6800pF
Cgate=6800pF
130
180
90
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0.6
V
V
40
nS
nS
nS
kΩ
3
MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC
PIN FUNCTIONS
Pin #
1
2
3
Name
IGBTIN
IGBTOUT
SW
4
PG
5
FB
6
EN
7
8
PGND
AGND
9,10
VIN
MP3356 Rev. 0.91
1/29/2010
Description
Logic Input Pin for IGBT Drive.
Output Drive for IGBT Gate. Connect this pin to the gate of the IGBT.
Switch Pin. This is the drain of the internal power switch.
Open-Drain Power-Ready Output. PG becomes low when the output voltage is
reached.
Feedback Pin. Its trip voltage is 300V
Charge Enable Pin. A low to high transition on this pin puts the part into power delivery
mode. Once the target voltage is reached, the part will stop charging the output. Toggle
this pin will start charging again. Bring this pin low will terminate the power delivery and
put the part in shutdown.
Power Ground
Analog ground. Tie it directly to local ground plane.
Input Supply Pin. Connect it to system supply voltage. Bypass VIN to AGND with a
0.1uF or greater ceramic capacitor.
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MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC
TYPICAL PERFORMANCE CHARACTERISTICS
TA = +25°C, unless otherwise noted.
Vin=3V, Iset=1.5A
with 1:8 transformer
3900
3600
Iset=1.5A, Cout=100uF, Vo=300V
3300
3000
2700
2400
2100
1800
1500
1200
900 Iset=1.5A, Cout=47uF, Vo=300V
600
2.5 3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
85
80
Vin=6V, Lpri=9.8uH
75
70
Vin=4.5V, Lpri=9.8uH
65
60
Vin=3V, Lpri=9.8uH
55
50
45
40
70
110 150 190 230 270 310
OUTPUT VOLTAGE (V)
Line Regulation
NORMALIZED OUTPUT VOLTAGE(V)
Efficiency
EFFICIENCY (%)
CHARGE TIME (ms)
Charge Time vs.
Input Voltage
1.001
1
0.999
Iset=1.5A, Cout=47uF, Vo=300V
0.998
0.997
0.996
0.995
0.994
0.993
2.5
3 3.5
4 4.5
5 5.5
6 6.5
INPUT VOLTAGE (V)
Output Voltage vs.
Input Voltage
OUTPUT VOLTAGE(V)
295.2
294.9
Iset=1.5A, Cout=47uF, Vo=300V
294.6
294.3
294
293.7
293.4
293.1
2.5
3 3.5
4 4.5
5 5.5
6 6.5
INPUT VOLTAGE (V)
MP3356 Rev. 0.91
1/29/2010
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MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TA = +25°C, unless otherwise noted.
MP3356 Rev. 0.91
1/29/2010
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MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC
BLOCK DIAGRAM
SW
PG
Delay
300ns
EN
S
Q
R
Q
+
-
+
-
One
Shot
Q
S
Q
R
VIN
+
-
VILIM
27mV
FB
1.2V
IGBTIN
IGBTOUT
Figure 1—Functional Block Diagram
MP3356 Rev. 0.91
1/29/2010
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MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC
OPERATION
The MP3356 controlled flyback charger operates
in critical conduction mode with 1.5A peak
current. The output voltage is divided down
through an internal 300: 1 resistive divider from
the positive terminal of the transformer
secondary (FB pin) and compares it with an
internal 1.2V reference.
The low to high
transition of the EN pin will enable the flyback
converter to switch.
A constant TOFF of 20µs is used when the output
voltage is below 20V to avoid inrush current. The
boundary mode operation will follow to minimize
charge time when the output voltage is above
20V. A minimum TOFF of 200ns serves as
MP3356 Rev. 0.91
1/29/2010
blanking for turn off transition. The circuit will stop
switching and PG will be pulled low once the
flash capacitor is charged to 300V. This value is
set by the internal 300:1 R divider and the 1.2V
reference. When charge is complete, the part will
shut down its internal circuitry and draw less than
100uA drawn from Vin. The EN pin will restart the
charge. Bringing the EN pin low terminates the
power delivery and puts the part in shutdown. A
maximum TON timer prevents pulling current from
a depleted battery. If the ON time exceeds the
maximum TON, the switch is forced OFF
regardless of IPEAK detection.
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MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC
APPLICATION INFORMATION
Charge Speed
The output capacitor
determined by:
Tch arg e ∝
charging
speed
is
ILIM
VIN +
N
VOUT
Primary Inductance
The primary inductance is calculated based on
the minimum off time period:
V T
Iprimary ≥ OUT min,off
NIPEAK
VOUT: output voltage about 300V
TMIN-OFF Minimum off time 200ns.
IPEAK: primary peak current
MP3356 Rev. 0.91
1/29/2010
Turns Ratio
The minimum turns ratio
transformer is obtained as:
VOUT
N≥
Vds − VIN
VDS: FET drain-source voltage
VIN: Input voltage 3~5V
of
the
flyback
Output Diode Selection
The reverse voltage of the output diode is
determined by:
VD = VOUT + NVIN
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MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC
PACKAGE INFORMATION
QFN 10 (2mm×2mm)
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
MP3356 Rev. 0.91
1/29/2010
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© 2010 MPS. All Rights Reserved.
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