AT1393AF [AIMTRON]
6-Channel DC-DC Converter IC for DSC; 6通道DC-DC转换器IC，适用于DSC
| 型号： | AT1393AF |
| 厂家： | 
AIMTRON TECHNOLOGY |
| 描述： | 6-Channel DC-DC Converter IC for DSC |
| 文件： | 总22页 (文件大小：724K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
Features
General Description
• Low start-up power supply voltage :1.7V(CH6) The AT1393 provides a complete power solution
• Wide supply voltage range from 2.4V to 6.5V
(CH6); 3.6V to 6.5V(CH1~5)
for digital still and video cameras through the
integration of synchronous rectification topology ,
soft start function and short circuit detection
function. This IC is ideal for applications that use
either 2 or 3 alkaline or NIMH batteries as well as
those using a single Li-ion battery.
• Up to 1MHz operating frequency
• Supports for down and up/down Zeta
synchronous rectification conversion(CH1)
• Supports for up and up/down SEPIC
synchronous rectification conversion(CH2, CH5)
• Supports for up, flyback and up/down SEPIC
conversion
AT1393/C: CH2,CH3, CH4 , CH5 and CH6
AT1393A/B:CH2,CH3,CH5 and CH6
• Supports for inverting conversion
AT1393A:CH4
Applications
• Digital Cameras
• CCD Imaging Devices
• Camcorders
• Synchronized rectification on CH1,CH2,CH5
• Power ON/OFF control function
• Built-in Soft-Start function
• Built-in Short-Circuit Protection circuit.
• LQFP 48 package
Pin Assignment
Ordering Information
Part Number
AT1393F
Package
LQFP48
Marking
AT1393F
_
LQFP48, PB-Free
LQFP48,Green
AT1393F,date code with one bottom line
AT1393F PBF
_
AT1393F,date code with two bottom line
AT1393F GRE
AT1393AF
LQFP48
AT1393AF
_
LQFP48, PB-Free
LQFP48,Green
AT1393AF,date code with one bottom line
AT1393AF PBF
_
AT1393AF,date code with two bottom line
AT1393AF GRE
Aimtron reserves the right without notice to change this circuitry and specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
Pin Description
Pin No. Pin name Function
1
SWOUT
SWIN
FB6
2
Output Switch Control Circuit Input
CH6 Error Amplifier Output
3
4
IN6
CH6 Error Amplifier Inverted Input
CH6 Soft Start Setting
5
CIN6
DTC5
FB5
6
CH5 Dead Time Control
7
CH5 Error Amplifier Output
8
IN5
CH5 Error Amplifier Inverted Input
CH4 Inverting Amplifier Input
CH4 Inverting Amplifier Output
CH4 Error Amplifier Output
9
INA4
OUTA4
FB4
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
IN4
CH4 Error Amplifier Inverted Input
CH4 Short Detection Comparator Inverter Input
CH4 Dead Time Control
INS4
DTC4
CS
CH1 to CH5 Soft Start Setting
Reference 2.5V Output
VREF
AGND
CSCP
VCC
CTL
Ground
Timer Latch Shout-Circuit Detection Input
Power Supply
CH6 Power Supply Control Input
CH1 and CH2 ON/OFF Control Input
CH3 ON/OFF Control Input
CTL1_ 2
CTL3
CTL4
CTL5
RT
CH4 ON/OFF Control Input
CH5 ON/OFF Control Input
Oscillation Frequency Setting Resistor
Oscillation Frequency Setting Capacitor
Triangular Wave Oscillator Regulator Output
CH3 Error Amplifier Inverted Input
CH3 Error Amplifier Output
CT
VB
IN3
FB3
DTC3
IN2
CH3 Dead Time Control
CH2 Error Amplifier Inverted Input
CH2 Error Amplifier Output
FB2
DTC2
IN1
CH2 Dead Time Control
CH1 Error Amplifier Inverted Input
CH1 Error Amplifier Output
FB1
DTC1
OUT1-1
OUT1-2
OUT2-1
OUT2-2
OUT3
PVCC
OUT4
CH1 Dead Time Control
CH1 Main Side Output(P-CH MOSFET)
CH1 Synchronous Rectifier Side Output
CH2 Main Side Output
CH2 Synchronous Rectifier Side Output
CH3 Output(N-CH MOSFET)
Output Circuit Power Supply
CH4 Output
AT1393/C:Drive N-CH MOSFET for boost converter
AT1393A/B:Drive P-CH MOSFET for inverting
44
45
46
47
48
PGND
OUT5-1
OUT5-2
OUT6
RB
Output Circuit Ground
CH5 Main Side Output(N_CH MOSFET)
CH5 Synchronous Rectifier Side Output
CH6 Output
Output Current Setting Resistor
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
2
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
Absolute Maximum Ratings
Parameter
Symbol
Condition
Unit
Min
Max
Power supply voltage
Output current
Vcc
Io
--
--
7
V
mA
mA
mW
℃
Output pin
--
--
20
200
860
85
Output pin, Duty≦5%
Output peak current
Power dissipation
Io
PD
--
Ta≦25℃ (LQFP-48P)
Operating temperature
Storage temperature
ESD Susceptibility (HBM)
ESD Susceptibility (MM)
TOPT
TSTG
--
--
--
--
-30
-55
--
℃
125
2
KV
V
200
--
Recommended Operating Conditions
Value
Min Typ Max
Parameter
Startup power supply voltage
Power supply voltage
Symbol
Condition
Unit
Vcc CH6
1.7
2.4
3.6
-1
--
5.0
5.0
--
5.5
5.5
5.5
0
V
V
V
CH6
Vcc
CH1 to CH5
VREF pin
VB pin
Reference voltage output current
VB pin output current
IOR
IB
mA
-0.5
--
0
mA
IN1 to IN5, INA4, INS4
pins
0
--
Vcc
V
Input voltage
VIN
IN6 pin
VCTL CTL pin
0
0
--
1
--
--
--
2
2
1
Vcc-0.9
V
V
mA
mA
mA
kΩ
Control input voltage
Output current
7
OUT pin (CH1 to CH5)
OUT pin (CH6)
OUT pin
15
15
4
Io
Output current setting resister
Oscillator
RB
fOSC
CT
RB6 pin
2.4
24
51
--
100
47
500
100
1000 kHz
Timing capacitor
Timing resistor
--
--
560
pF
kΩ
μF
μF
μF
RT
Cs
8.2
--
--
18
0.027
0.47
0.1
100
1.0
1.0
1.0
CH1 to CH5
C+IN6 CH6
Soft start capacitor
Short detection capacitor
VB pin capacitor
CSCP
CVB
Ta
--
--
--
--
μF
0.082
-20
0.1
25
--
℃
Operating ambient temperature
85
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
3
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
Electrical characteristics
Parameter Symbol
(Ta=25℃, VCC=PVCC=5V)
Value
Condition
Unit
Min Typ Max
Reference voltage
VREF
--
2.40
2.50
2.60
V
Output voltage
temperature
stability
△VREF
/VREF
Ta = -30℃ to 85℃
--
0.5
--
%
Input stability
Load stability
Line VCC=3.6 to 5.5V
-10
-10
--
--
10
10
mV
mV
Load VREF=0mA to –1mA
VTH VIN=0V to VCC
Threshold voltage
Hysteresis width
Reset voltage
2.6
--
2.8
0.2
3.0
--
V
V
V
VH
--
VRST VIN=VCC to 0V
VTH VIN=0V to VCC
1.20
1.30
1.40
Threshold voltage
1.35
1.5
1.65
V
μA
Charge current
ICS
--
-1.4
-1.0
-0.6
μA
Charge current
ICIN6
-3.0
-2.5
-2.0
Threshold voltage
Input standby
voltage
VTH
VSTB
VI
--
--
--
--
0.65
--
0.70
50
0.75
100
100
-0.6
V
mV
mV
μA
Input latch voltage
--
50
Input source
ICSCP
-1.4
-1.0
current
Oscillator
frequency
Frequency
stability for
voltage
CT=100pF, RT=18kΩ
fOSC
450
--
500
1
550
10
kHz
%
△f
VCC=4V to 5.5V
/fdv
Frequency
stability for
temperature
△f
Ta=-30℃ to 85℃
--
1
20
%
/fdt
Threshold voltage
VTH FB=IN
1.24
--
1.25
0.5
1.26
--
V
VT temperature
△VT/VT Ta = -30℃ to 85℃
%
stability
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
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Email: service@aimtron.com.tw
4
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
IN=0V
-320
-80
--
nA
(CH1 to CH3, CH5)
Input bias current
Voltage gain
IB
IN=0V (CH4)
DC
-120
60
-30
--
--
nA
dB
AV
100
Frequency
bandwidth
BW AV=0dB
--
1.0
--
MHz
VOH
VOL
--
--
2.2
--
2.4
50
--
200
V
mV
Output voltage
Output source
current
ISOURCE FB=2.3V
--
-2.0
-1.0
mA
Output sink
μA
V
ISINK FB=1.45V
VTH FB=0.55
70
1.24
--
140
1.25
0.5
--
1.26
--
current
Threshold voltage
Temperature
△VT/VT Ta = -30℃ to 85℃
%
stability
Input bias current
Voltage gain
IB
IN=0V
DC
-100
60
-20
75
--
--
nA
dB
AV
Frequency
BW AV=0dB
--
1.0
--
MHz
bandwidth
VOH
VOL
--
--
1.1
--
1.3
0
--
200
V
mV
Output voltage
Output source
current
ISOURCE FB=0.55V
ISINK FB=0.55V
--
-2.0
120
0
-1.0
--
mA
μA
mV
Output sink
current
60
Input offset
VIO
OUT=1.25V
-10
10
voltage
Input bias current
Voltage gain
IB
IN=0V
DC
-120
60
-30
--
--
nA
dB
AV
100
Frequency
BW
AV=0dB
--
1.0
--
MHz
bandwidth
VOH
VOL
--
--
2.2
--
2.4
50
--
200
V
mV
Output voltage
Output source
current
Output sink
current
ISOURCE OUT=1.25V
ISINK OUT=1.25V
--
70
-2.0
140
1.00
-1.0
--
mA
μA
VTH
Threshold voltage
CH1 to CH5
0.97
1.03
%
IN=0V
-320
-200
-80
-50
--
nA
nA
(CH1 to CH3, CH5)
Input bias current
IB
IN=0V (CH4)
Threshold voltage
VTH
--
0.8
0.9
1.0
V
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
5
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
VT0
Duty = 0 %
1.0
--
1.1
1.8
--
V
V
Threshold voltage
Input current
VTmax Duty = 100 %
1.9
DTC=0.4V
IDTC
μA
-1.0
-0.3
--
(CH1 to CH5)
VT0
VTmax Duty = 100 %
CT=100pF, RT=18kΩ
RB=24kΩ
Duty = 0 %
0.2
--
0.3
--
V
V
Threshold voltage
0.74
0.84
Maximum duty
cycle
Dtr
70
80
--
%
Output source
current
Output sink
current
ISOURCE OUT=VCC/2
ISINK OUT=VCC/2
--
--
-130
100
--
--
mA
mA
Ω
Ω
ROH OUT = -15mA
ROL OUT = 15mA
--
--
18
16
30
25
Output ON
resistor
Output source
current
Output sink
current
ISOURCE OUT=VCC/2
ISINK OUT=VCC/2
--
--
-130
100
--
--
mA
mA
Ω
Ω
ROH OUT = -15mA
ROL OUT = 15mA
--
--
18
16
30
25
Output ON
resistor
Output source
current
OUT=0.7V,RB=24kΩ
ISOURCE
-2.6
--
-2.0
40
-1.4
--
mA
Output sink
current
Duty≦5%,OUT=0.7V
ISINK
mA
V
VIH
VIL
SWOUT = ”L” level
SWOUT = ”H” level
1.5
0
--
--
6.5
0.4
SW input voltage
Input current
V
μA
ISWIN SWIN = 5V
--
100
200
Duty≧95%,
Output source
ISOURCE
--
--
-9
--
--
mA
current
SWOUT=0V
Output sink
current
Duty≦5%, SWOUT=5V
ISINK
17
mA
Ω
Ω
ROH SWOUT = -4mA
ROL SWOUT = 4mA
--
--
250
100
400
150
Output ON
resistor
VIH
VIL
Active mode
1.5
--
6.5
V
CTL input voltage
Input current
Standby mode
0
--
100
--
0.4
200
10
V
μA
μA
ICTL CTL = 5V
--
--
VCC Standby
Icss
Icss(o)
Icc
CTL=0V
current
PVCC Standby
current
μA
CTL=0V
--
--
--
6
10
9
VCC Nominal
Supply current
CTL, CTL1 to CTL5 =
5V
mA
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
6
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
Block Diagram
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
7
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
Application Circuit
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
8
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
9
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
Typical Characteristics
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
10
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
11
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
Function Description
1. Power Converter
＊Reference voltage block
A temperature independent voltage of typical value at 2.50V is generated from the
power source by the reference voltage circuit, which is used as a reference voltage
for all internal circuitry and supplies load current to external device up to 1 mA.
＊Triangular oscillator block
A triangular oscillation waveform is generated by connecting a timing resistor (RT)
to pin 25 and a timing capacitor (CT) to pin 26. The resulting waveforms CT
(amplitude at 0.3V to 0.8V), CT1 (in phase with CT with amplitude at 1.1V to
1.8V) and CT2 (reverse phase with CT with amplitude at 1.1V to 1.8V) serve as
input to the PWM comparator.
＊Error amplifier block
The error amplifier controls the error signal to the PWM comparator by sensing
the DC/DC converter output voltage. Furthermore, by connecting feedback
resistor and capacitor from the output pin to the inverted input pin of the error
amplifier, an arbitrary loop gain can be set to make the system stable.
＊Inverting amplifier block
The inverting amplifier detects the negative DC/DC converter output voltage
and sends a control signal to the error amplifier.
＊PWM comparator block
The PWM comparator converts the input voltage to pulse width and thereby the
duty cycle of the DC/DC converter.
Channels 1, 2, and 5 main sides, channel 3, 4, and 6 : The comparator keeps the
output transistor turn on while the error
amplifier output voltage and DTC voltage
are higher than the triangular wave voltage.
Channels 1, 2, and 5 synchronous rectification sides : The comparator keeps the
output transistor turn on while the error
amplifier output voltage are lower than the
triangular wave voltage.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
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Email: service@aimtron.com.tw
12
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
＊Output block
A totem pole configuration is designed for the output block and can drive external
MOSFET or transistor.
2. Channel Control
The channels are turned on and turned off according to the voltage levels at the
CTL, CTL12, CTL3, CTL4, and CTL5 as described in the following table.
Voltage level at control (CTL) pin
Channel on/off status
CTL CTL1,2 CTL3 CTL4 CTL5 CH6 CH1,2 CH3
CH4
CH5
L
X
X
X
L
X
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
OFF (standby state)
OFF
ON
OFF
L
OFF
ON
OFF
ON
H
L
L
OFF
OFF
ON
OFF
H
L
ON
OFF
ON
H
L
ON
H
ON
OFF
ON
OFF
OFF
ON
OFF
ON
H
L
H
ON
OFF
ON
OFF
H
ON
OFF
ON
H
ON
X : Don’t care
3. Protective Functions
＊Short circuit protection and timer latch
The comparator for short circuit detection in each channel detects the output
voltage level of the power converter. When the output voltage falls below the
short detection level, there will be a constant bias current charging the external
capacitor CSCP that is connected to the CSCP pin until the capacitor voltage level
reaches about 0.7V and the output transistor turned off consequently. The
actuated protection can be reset by restarting the power source.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
13
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
＊Under-voltage lockout protection
The under-voltage lockout protection is triggered when the supply voltage
momentarily drops during transient, which may cause the IC to malfunction. To
prevent such malfunctions, the under-voltage lockout protection circuit will turn
off the output transistor, set the dead time to 100%, and hold the CSCP pin at the
“L” level after detecting a decrease in internal reference voltage with respect to
the power supply voltage,.
＊Output switch control
When the power is turned on, output switch control circuit (SWIN = “L”) prevents
the reactive current from flowing to external CH5 and CH6. After releasing
UVLO and the C+IN6 pin voltage goes above 0.9V, if SWIN is “H” then SWOUT
becomes “L” to turn on the external MOSFET and generate output voltage.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
14
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
4. Soft Start Function
＊The CTL, CTL1,2, CTL3, CTL4, and CTL5 terminals are driven to high level at
the same time. The driving scheme is described in the following diagram.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
15
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
＊After CH6 soft start and driving the CTL1,2, CTL3, CTL4, and CTL5 to high
level. The driving scheme is described in following diagram.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
16
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
＊Soft start setting (for CH6)
Consider the input voltage and the load current to decide the value of the capacitor
connected to the CIN6 pin. The soft start time Ts(s) until the DC/DC converter
output voltage of CH6 reaches 95% can be calculated by:
Ts(s) = 0.45 * C1(μF)
＊Soft start setting (for CH1 to CH5)
Ts(s) = 1.25 * CS(μF)
Note : It could be disabled soft start function by floating CIN6 pin or CS pin.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
17
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
Determine Oscillator Frequency
The triangular oscillator frequency is decided by the timing capacitor (CT) and
timing resistor (RT) according to the following formula:
fOSC(KHz) = 900000/( RT(KΩ)* CT(pF))
DC/DC Output Voltage
＊For CH1 to CH3, CH5 and CH6
＊For CH4
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
18
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
19
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
The CH6 Source Current
The output circuit of CH6 is illustrated in the following diagram. It can determine
the output source current by defining the value of resistor RB.
Note that the source current can be calculated by the following equation.
Output source current = (VRB/RB) * 210 (A)
Setting Time of Short Circuit Protection
The SCP comparator in each channel detects the output voltage to decide whether the
power converter works at normal condition. At the same time, the voltage level of
CSCP pin is held at low level. If the output load of these converters rapidly
malfunction or become shorted, causing the output voltage to drop, the SCP
comparator detects that and enables short circuit protection. The time period for
short circuit protection is shown in the following equation.
Short detection time (tPE(s))
tPE(s) = 0.7 * CSCP (μF)
Note : It could be disabled short circuit protection function by connecting CSCP
pin into the ground.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
20
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
Setting the Dead Time Control Level
When using step up or Zeta or flyback DC/DC converter, it must prevent that
output transistor works at full-ON state (ON duty = 100%). To prevent this
situation, set the maximum duty of these channels. The dead time control circuit
is implemented as below. When the voltage at the DTC1 pin is higher than the
triangular wave voltage (CT1), the output transistor is turned on. The maximum
duty calculation formula assuming that triangular wave amplitude = 0.7V and
triangular wave minimum voltage = 1.1V.
Duty = Vd −1.1 / 0.7 ×100%
( ) ]
Note 1 : The circuit is suitable at CH1 to CH5.
Note 2 : Shorting DTC and VREF to disable dead time control function.
Using CH4 Inv Amp.
When not using the CH4 INV Amp., connect the INA4 and OUTA4 each other.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
21
AT1393/A/B/C
Preliminary Product Information
6-Channel DC-DC Converter IC for DSC
Package Description
LQFP48
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
22
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