AT1396A [ETC]
Preliminary Product Information 6-Channel DC-DC Converter for DS; 初步产品信息6通道DC-DC转换器，用于DS
| 型号： | AT1396A |
| 厂家： | 
ETC |
| 描述： | Preliminary Product Information 6-Channel DC-DC Converter for DS |
| 文件： | 总24页 (文件大小：798K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Features
General Description
The AT1396A/B/C/D provide a complete power
supply solution for digital cameras. They improve
performance, component count, and size compared
to other multi-channel controllers in 2-cell AA,
1-cell Li-Ion, and dual-battery designs. On-chip
MOSFETs provide up to 92~95% efficiency for
critical power supplies, while additional channels
operate with external FETs for optimum design
flexibility. All channels DC/DC operate at one
fixed frequency settable from 100KHz to 1MHz to
optimize size, cost, and efficiency.
• 95% Efficient possible DC/DC Converter
• Combine Step-Up and Step-Down for
90% Efficient Boost-Buck
• Bulit-in LED Driver and Open LED
Overvoltage Protection
• Transformerless Inverting Controller for CCD
Bias
• 2 Channel Built-in MOSFET Current- Mode
PWM and 4 Channel Extra PWM Controllers
(CH-3 Synchronous Output)
• Up to 1MHz Operating Frequency
• Shutdown Current <1uA
• Built-in Soft-Start Function
• Built-in Short-Circuit Protection Function
• QFN48 Package
Applications
• DSC Power Supply
Pin Assignment
Ordering Information
Part Number
AT1396AN
AT1396BN
AT1396CN
AT1396DN
Package
Marking
AT1396AN
AT1396BN
AT1396CN
AT1396DN
QFN48,Green
QFN48,Green
QFN48,Green
QFN48,Green
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
REVD: 05/05/23
1
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter 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
REVD: 05/05/23
2
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Pin Description
Pin No. Pin name
I/O
Description
1
2
3
4
5
6
7
8
SS1
CTL5
CTL6
LXU
CTLU
PGND1
PGND2
CTLD
LXD
CTL3
CTL4
SS2
/SDOK
CSCP
PVCC2
COMP2
FBD
I
I
I
O
I
P
P
I
O
I
I
I
O
I
P
O
I
I
O
I
I
O
I
CH1 Soft-Start Input
CH5 Enable Input
CH6 Enable Input
Step-Up Converter Switching Node
CH1 Enable and Chip Enable Input
Power Ground
Power Ground
CH2 Enable Input
9
Step-Down Converter Switching Node
CH3 Enable Input
CH4 Enable Input
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
44
45
46
47
48
CH2 Soft-Start Input
Open-Drain, Active Low, Power Good for Step-Down
Short Circuit Protection Input
Step-Down Converter Input
Step-Down Converter Compensation Node
Step-Down Converter Feedback Input
CH3 Soft-Start Input
CH3 Compensation Node
CH3 Feedback Input
CH4 Soft-Start Input
CH4 Compensation Node
CH4 Negative Feedback Input
CH4 Positive Feedback Input
CH3 Power
CH3 Master Output Driver
CH3 Slave Output Driver
Power Ground
SS3
COMP3
FB3
SS4
COMP4
IN4
IP4
I
PVCC3
OUT3M
OUT3S
PGND3
OUT4
OUT5
OUT6
PVCC4
GND
FB5H
FB5
COMP5
VBG
SS5
FB6
COMP6
CT
VREG
FBU
P
O
O
P
O
O
O
P
P
I
CH4 Output Driver
CH5 Output Driver
CH6 Output Driver
CH4 Power
Power Ground
CH5 Controller Voltage Feedback Input
CH5 Controller Voltage Feedback/Current Feedback
CH5 Compensation Node
Reference Bypass
CH5 Soft-Start Input
CH6 Feedback input
CH6 Compensation Node
Oscillator Control
Reference Output
Step-Up Converter Input
Step-Up Controller Compensation Node
IC power Input
Power Output of the Step-Up Converter
CH6 Soft-Start Input
I
O
O
I
I
O
O
P
I
O
P
P
I
COMP1
VCC
PVCC1
SS6
SEL4
I
Configures the CH4 as a Step-Up or Step-Down
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
REVD: 05/05/23
3
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Absolute Maximum Ratings
Item
Symbol
TSTG
TOPR
Ratings
Units
℃
Storage temperature
Operating temperature
-55～＋150
-30～＋85
-0.3～＋5.5
℃
V
PVCC1,PVCC2,PVCC3,PVCC
4 input voltage
LXU,LXD, OUT3M,OUT3S
input voltage
VLX/OUT
V
V
-0.3V～+5.5
Other input Pin
-0.3V～+5.5
LXU Current
LXD Current
OUT3M,OUT3S Current
Power consumption
ESD Classification
3.6
2.25
200
1000
2
A
A
mA
mW
KV
Pd
Electrical Characteristics
(PVCC1=PVCC2=PVCC3=PVCC4=VCC=3.6V, Ta=+250C)
Values
Unit
Parameter
Symbol
Condition
Min.
Typ.
Max.
GENERAL
Input Voltage Range
VCC Channel 1 DC/DC
No Switching,
1.2
-
-
5.5
1.1
V
CH1,CH2
Switch- Off Input Current
FBU=FBD=0.9V
IVCC
1
mA
CTLU=CTLD=3.6V,other
disable
No Switching,
CH1,CH2, CH3(or 4,5,6)
Switch- Off Input Current
FBU=FBD=FB3=0.9V
CTLU=CTLD=CTL3=3.6V
other disable
IVCC
-
-
1.2
1
1.3
10
mA
μA
Shutdown Current
IVCC All CTL disable
REFERENCE
Reference Output Voltage VREG IREG =1mA
Reference Load
2.275
2.30
2.325
10
V
1mA< IREG <10mA
-
-
5
-
mV
mV
∆VREG1
Regulation
Reference Line Regulation
2.5<VCC<5.5V
5
∆VREG2
OSC
Frequency
fOSC CT=82pF
T =-20°C ~+85°C
-
-
500
1
-
KHz
%
Frequency variation with
Temperature
10
∆fOSC1
a
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
REVD: 05/05/23
4
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Frequency variation with
Input Voltage
VCC =2.5V~5.5V
-
1
5
%
∆fOSC2
CHANNEL 1(STEP-UP)
Pre-OSC to OSC Trip
Level
Pre-OSC to OSC
Hysteresis
VCC1 VCC rising edge
∆VCC1
-
2.45
100
2.45
-
-
-
V
mV
V
-
Under Voltage Lockout
Input Voltage Range
VCC
-
-
PVCC1 Channel 1 DC/DC
ISS1 VCC =2.5V~5.5V
1.2
6.0
1.5
0.816
100
-
V
Normal Operating
Soft-Start Charge Current
0.8
1
µA
V
T =-20°C ~+85°C
a
FBU Regulation Voltage
FBU input Current
VFBU
0.784
0.8
-
IFBU FBU=0.8V
RCS
-
-
nA
V/A
µs
Current-Sense Amplifier
Transresistance
0.285
140
90
Transconductance
GMEA
-
-
Maximum Duty Cycle
PVCC1 Leakage Current
LX Leakage Current
DMAX FBU=0.7V
85
-
95
12
5
%
V
V
=0V,PVCC1=5.5V
=5.5V
IL1
5
µA
µA
mΩ
mΩ
A
LXU
LXU
ILX1
-
1
RN N-Channel
RP P-Channel
ILimit1
-
95
150
250
2.4
-
Switch On-Resistance
-
150
2.1
20
N-Channel Current Limit
1.8
-
P-Channel Turn-off
Current
IREV1
mA
mA
KHz
Startup Current Limit
Startup Frequency
ILimit-s PVCC1=1.5V
fSTART PVCC1=1.5V
-
450
200
-
-
-
CHANNEL 2(STEP-DOWN)
Input Voltage Range
PVCC2 Channel 2 DC/DC
ISS2 VCC =2.5V~5.5V
T =-20°C ~+85°C
1.2
0.8
-
1
6.0
1.5
V
µA
V
Normal Operating
Soft-Start Charge Current
FBD Regulation Voltage
VFBD
0.784
0.8
0.816
a
FBD input Current
IFBD FBD=0.8V
-
-
100
nA
Current-Sense Amplifier
Transresistance
RCS
-
-
-
0.6
140
100
-
-
-
V/A
Transconductance
GMEA
µs
Maximum Duty Cycle
DMAX FBD=0.7V
%
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
REVD: 05/05/23
5
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
V
=0~3.6V,PVCC2=3.6V
LX Leakage Current
Switch On-Resistance
P-Channel Current Limit
ILX2
-
-
1
5
150
250
1.4
-
µA
mΩ
mΩ
A
LX
RN N-Channel
RP P-Channel
ILimit2
95
-
150
1.2
20
1.0
-
N-Channel Turn-off
Current
IREV2
mA
V
/SDOK Output Low
Voltage
VSDOK 0.1mA into /SDOK
IL_SDOK CTLD=0V,/SDOK=5.5V
-
0.01
0.1
0.1
1
/SDOK Leakage current
CHANNEL 3
-
µA
Input Voltage Range
PVCC3 Channel 3 DC/DC
ISS3 VCC =2.5V~5.5V
IFB3 FB3=0.8V
1.2
-
1
6.0
V
µA
nA
V
Normal Operating
Soft-Start Charge Current
0.8
1.5
FB3 input Current
-
-
100
T =-20°C ~+85°C,
FB3=COMP3
a
FB3 Regulation Voltage
VFB3
0.784
0.8
-
0.816
Error Amplifier Voltage
Gain
AV DC
80
-
-
-
dB
MHz
V
Error Amplifier Frequency
Bandwidth
BW AV=0dB
5
V
-
1.0
10
-0.5
60
-130
100
18
16
90
100
-
OH
Error Amplifier Output
Voltage
V
-
-
mV
mA
µA
mA
mA
Ω
OL
Isource
COMP=0.8V
-
-
Error Amplifier Output
Source Current
Isink
Isource
Isink
COMP=0.8V
-
-
Output Source Current
Output Sink Current
DUTY=90%,OUT=1/2VCC
DUTY=0%,OUT=1/2VCC
OUT=-15mA
-
-80
-
65
-
ROH
ROL
30
25
95
-
Output On-Resistor
OUT=15mA
-
Ω
DMAX Step-Up Mode
85
-
%
Maximum Duty Cycle
DMAX Step-Down Mode
%
CHANNEL 4,5,6
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
REVD: 05/05/23
6
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Input Voltage Range
PVCC4 Channel 4,5,6 DC/DC
ISS4/5/6 VCC =2.5V~5.5V
1.2
-
1
6.0
1.5
0.816
0.21
1.02
-
V
µA
V
Normal Operating
Soft-Start Charge Current
0.8
T =-20°C ~+85°C,
FB_=COMP_
FB4/5/6 Regulation
Voltage
a
VFB4/5/6
0.784
0.8
0.20
1.00
-
T =-20°C ~+85°C,
FB5=COMP5
FB5 Regulation Voltage
for LED Driver
a
VFB5
0.19
V
T =-20°C ~+85°C,
a
FB5H OVP Trip Level
VFB5H
0.98
V
Error Amplifier Voltage
Gain
AV DC
80
-
dB
MHz
V
Error Amplifier Frequency
Bandwidth
BW AV=0dB
5
-
V
-
1.0
10
-
OH
Error Amplifier Output
Voltage
V
-
-
mV
mA
µA
%
OL
Isource
COMP=0.8V
COMP=0.8V
-
-0.5
60
-
Error Amplifier Output
Source Current
Isink
-
-
DMAX FB_=0.7V
DMAX FB5=0.1V
85
85
-
90
95
95
-80
-
Maximum Duty Cycle
90
%
Isource
Output Source Current
Output Sink Current
DUTY=90%,OUT=1/2VCC
DUTY=0%,OUT=1/2VCC
OUT=-15mA
-130
100
18
mA
mA
Ω
Isink
65
-
ROH
ROL
30
25
Output On-Resistor
OUT=15mA
-
16
Ω
SHORT CIRCUIT PROTECTION
VTH
Threshold Voltage
CH3,CH4,CH5,CH6
-
0.9
1.0
-
V
ICSCP
CSCP Charge Current
CONTROL BLOCK
0.8
1.5
µA
VIH
VIL
VIH
VIL
PVCC1=VCC=1.5 ~5.5V
PVCC1=VCC=1.5 ~5.5V
1.1
0
-
-
-
-
VCC
0.5
V
V
V
V
CTLU input Voltage
CTLD input Voltage
PVCC1 , 2=VCC=1.5 ~5.5V
CTLD=VIH
1.1
0
VCC
0.5
PVCC1 , 2=VCC=1.5 ~5.5V
CTLD=VIH
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
REVD: 05/05/23
7
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
PVCC1 , 3=VCC=1.5 ~5.5V
CTLU=VIH
VIH
VIL
VIH
VIL
VIH
VIL
1.4
0
-
-
-
-
-
-
VCC
0.5
V
V
V
V
V
V
CTL3 input Voltage
PVCC1 , 3=VCC=1.5 ~5.5V
CTLU=VIH
PVCC1 , 4=VCC=1.5 ~5.5V
CTLU=VIH
1.4
0
VCC
0.5
CTL4 , 5 , 6 input Voltage
SEL4 input Voltage
PVCC1 , 4=VCC=1.5 ~5.5V
CTLU=VIH
PVCC1 , 4=VCC=1.5 ~5.5V
CTLU=CTL4=VIH
1.4
0
VCC
0.5
PVCC1 , 4=VCC=1.5 ~5.5V
CTLU=CTL4=VIH
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
REVD: 05/05/23
8
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Characteristics
CH1 Efficiency VS. Load Current
CH3 Efficiency VS. Load Current
CH2 Efficiency VS. Load Current
CH4 , 5 , 6 Efficiency VS. Load Current
CH1 + CH2 Efficiency VS. Load Current
CH1 + CH2 Efficiency VS. Load Current
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
REVD: 05/05/23
9
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
CH4 , 5 , 6 Efficiency VS. Load Current
CH4 , 5 , 6 Efficiency VS. Load Current
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
REVD: 05/05/23
10
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter 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
REVD: 05/05/23
11
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
CH3 Start-Up Waveform
VBAT = 2.0V
Time : 20mS/Div
CTL3 , 2V/Div , DC
VM=3.3V , 2V/Div , DC
IoutM ,100mA/Div , DC
IBAT , 1A/Div , DC
CH3 Start-Up Waveform
VBAT = 3.0V
Time : 20mS/Div
CTL3 , 2V/Div , DC
VM=5.0V , 2V/Div , DC
IoutM , 100mA/Div , DC
IBAT , 1A/Div , DC
CH1,CH2,CH3 Start-Up Waveform
VBAT = 3.0V
Time : 50mS/Div
CTLU , 2V/Div , DC
VDSP_IO=3.3V , 2V/Div , DC
VDSP_Core=1.8V , 1V/Div , DC
VM=5V , 5V/Div , DC
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
REVD: 05/05/23
12
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
CH1 Load Transient Response
VBAT = 3.0V
Time : 1mS/Div
VM , 100mV/Div , AC
Iout1 , 200mA/Div , DC
CH2 Load Transient Response
VBAT = 2.0V
Time : 1mS/Div
VDSP_Core , 100mV , AC
Iout2 , 100mA/Div , DC
CH3 Load Transient Response
VBAT = 3.0V
Time : 1mS/Div
VDSP_IO , 100mV/Div , AC
Iout3 , 100mA/Div , DC
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
REVD: 05/05/23
13
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Application Circuit
Multi-Battery Application
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
REVD: 05/05/23
14
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
2-AA Battery Application
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
REVD: 05/05/23
15
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
1-Li Battery Application
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
REVD: 05/05/23
16
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Application Information
The AT1396A/B/C/D include 6 channels DC/DC to generate a multiple-output digital
camera power-supply system. It include:
z Step-Up DC/DC converter with on-chip synchronous MOSFETs.(CH1)
z Step-Down DC/DC converter with on-chip synchronous MOSFETs.(CH2)
z Main synchronous DC/DC controller can be configured as either a Step-Up or
Step-Down converter.(CH3)
z Selectable DC/DC controller for boost/flyback/buck/inverting converters.(CH4)
z White LED driver with open LED protection or boost controller.(CH5)
z Boost/flyback controller.(CH6)
Step-Up DC/DC Converter (CH1)
The step-up DC/DC converter typically is used to generate a 5V or the highest of the
DSC power system requirement from a 1.5V to 4.2V battery input and self-power the
AT1396. The efficiency is up to 95% with an internal MOSFET and external
synchronous rectifier.
Step-Down DC/DC Converter (CH2)
The step-down DC/DC is optimized for generating DSP core voltage (down to 0.8V)
at high efficiency. It runs from the voltage at PVCC2. This pin can be connected
directly to the battery if sufficient headroom exists to avoid dropout. It can be
powered from the output of another converter (CH1 or CH3) for boost-buck
operation.
The CH2 also features an open-drain /SDOK output that goes low when the CH2 is in
regulation. /SDOK may be used to drive an external P-MOSFET that gates 3.3V
power to the DSP after the core voltage is in regulation (Figure 1). The R1,R2 and C1
is for MOSFET soft-start function to avoid the more inrush current .
Step-Up or Step-Down DC/DC Converter (CH3)
The CH3 can be as a step-up (AT1396B/D) or step-down (AT1396A/C) voltage mode
PWM converter. An external MOSFET and synchronous rectifier allow conversion
efficiencies as high as 93%. Step-down operation can be direct from Li-Ion cell if the
minimum input voltage exceeds the desired output by approximately 200mV. When
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AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
generating 3.3V from Li-Ion, boost-buck operation may be needed so a regulated
output can be maintained for input voltages above and below 3.3V. The efficiency is
best than SEPIC or ZETA structure. In this case, it may be configure the CH3 as a
step-down and connect its input PVCC3 to the CH1 output, set to a voltage at or
above 4.2V. The output efficiency with this topology is typically up to 90%. Note that
the step-up output (CH1) supplies both the step-up(CH1) load and the step-down
(CH2) input current when the CH3 is powered from the CH1. The CH3 input current
reduces the available step-up output (CH1) current for other loads.
Figure 1. Using /SDOK to drive external MOSFET that gates 3.3V power to DSP after 1.8V core voltage is in regulation
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AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Auxiliary Controller (CH4,CH5,CH6)
The three auxiliary controllers operate as fixed-frequency voltage-mode PWM
controllers. They use the external MOSFETs, so output power is determined by
external components. All of auxiliary controllers have a guaranteed duty cycle of
minimum duty cycle of 85%(boost-type) or 100%(buck/inverting type). In boost
designs that employ continuous current (CCM), the maximum duty cycle limits the
boost ratio so:
VIN
1−
≤ 85%
VOUT
With discontinuous inductor current(DCM), no such limit exists for the input/output
ratio since the inductor has time to fully discharge before the next cycle begins. The
discontinuous conduction mode boost voltage conversion relationship is given by:
4 × D2
1+ 1+
K
D = K × M × (M − 1)
VO = Vi ×
2
Where K is defined as:
VO
M =
Vi
2 × L
K =
R ×TS
The CH4 is selectable DC/DC controller for drive N-channel MOSFETs (SEL=high)
or P-channel MOSFETs (SEL=low). It can be configure as the inverting circuit
(Figure 2), typically for CCD and LCD bias. This is useful in height-Limited designs
where transformers may not be desired. The efficiency is more than the charge-pump
inversion for some load conditions.
The CH5 can be configure as a switching-mode boost current source for white LEDs,
FB5(0.2V) provides current-sensing feedback, while FB5H(1.0V) provides (optional)
open-LED over-voltage protection(Figure 3). If used as a boost converter, FB5H is
grounded and FB5(0.8V) is used as the feedback input. In this case, CH5 behaves
exactly like CH4 and CH6.
The CH6 can be used for conventional DC/DC boost and flyback designs.(Figure
4 ,Figure 5 and Figure 6)
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AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Figure 2. Regulated –7.5V negative CCD Bias.
Figure 3. LED Drive with open LED over-voltage protection
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AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Figure 4. +15V and –7.5V CCD Bias with transformer
Figure 5. +15V and –7.5V CCD Bias with Charge-Pump Inversion
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AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Figure 6. +15V and –7.5V CCD Bias with Charge-Pump (using AT1202 to regulated the negative output)
Soft-Start Setting (CH1~CH6)
The AT1396 all channels feature a soft-start function that limits inrush current and
prevents excessive battery loading at start-up by ramping the output voltage of each
channel up to the regulation voltage. Consider the input voltage and load current to
design the capacitor connected to the SS pin. It can calculate the CH1~6 soft start
time Ts(s)(valid threshold 0.3~0.8V interval).
∆V
∆t
C ×
= I
Ts(s) = 0.5× C(µF)
Note : It could be disabled soft start function by floating SS pin.
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AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
SCP Protection Setting (CH3~CH6)
The CSCP comparator detects CH3,CH4,CH5 and CH6 output voltage while the
power converter work 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 short, causing the output voltage to drop, the CSCP comparator detects
that to enable short circuit protection. The time period when short circuit protection
show as follow equation.
Short detection time (TPE(s))
TPE(s) = 0.9 * CCSCP (μF)
Note : It could be disabled short circuit protection function by connecting CSCP pin
into the ground.
Determine the triangular Oscillator Frequency
The triangular oscillator frequency is determined by the timing capacitor (CT). It is
difficult to incorporate these non-linear characteristics into the equation. This
difference is caused by characteristics, such as changes in the maximum voltage
amplitude of the sawtooth waveform with the CT value and the circuit delay causing
the maximum amplitude to become large in the case of a high oscillating frequency
even for the same capacitor. In practical use, therefore, the user should read the CT
values from the characteristic curve or should determine an approximate target value
by using the equation.
41000
fOSC (KHz) =
CT ( pF)
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23
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Package Outline: QFN48
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
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REVD: 05/05/23
24
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