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PDF AP3603 Data sheet ( Hoja de datos )
| Número de pieza | AP3603 | |
| Descripción | High Power Dual Output Step-Up DC-DC Controller | |
| Fabricantes | AKM | |
| Logotipo |  |
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[AP3603]
AP3603
High Power Dual Output Step-Up DC-DC Controller
1. General Description
The AP3603 is a dual output step-up DC-DC controller. The output voltage can be set up to 60V by an
external feedback resistor. A wide input range of 6.4V to 20V is available, which is possible to realize a high
power boost source from the battery or the other power sources. The AP3603 supports either 200W×2ch dual
outputs or 400W×1ch dual phase single output. PWM switching frequency is set from 40kHz to 500kHz by
an external resistor. As the protective functions, it has output over voltage protection and over current
protection. The AP3603 is housed in a space-saving 20-pin HTSSOP package.
2. Features
Input Voltage Range
6.4 to 20V
Oscillation Frequency Setting Range 40k to 500kHz（Set by external resistor）
8V Gate Driver for External N-channel MOSFET（ON resistance : 3Ω)
Over Temperature Protection
Output Over Voltage Protection
Quasi-Foldback Over Current Protection
Accuracy of Feedback Voltage +3% /-2 % (Tj=-40～145℃)
Dual Output or Dual Phase Single Output Application is Selectable
Package 20-pin HTSSOP
1
A
R7
R9
B
C8
R8
C7
C9 R10
C R11
PWON
R12
D
1
23456
Vin
R1 C1 A
FSYN
RT
FB1
CC1
GND1
SS
CC2
FB2
PWON
MDC
2
RSP1
RSN1
DRV1
GND2
VDD
V8
V4
DRV2
RSN2
RSP2
3
C4
C5
C6
L1
D1
M1
M2
D2
Title
Size
A4
Date:
File:
L2
Num be r
R2
2014/09/12
C:\Users\..\AP3603do_140912.SchDoc
45
CH-1 Vout
R3 C2
B
R4
CH-2 VoutC
R5 C3
R6
Revision
Sheet of
Drawn By :
6
D
Dual Output Application
1
A
R7
R9
B
C8
R8
C7
C9 R10
C R11
PWON
R12
D
1
2
FSYN
RT
FB1
CC1
GND1
SS
CC2
FB2
PWON
MDC
2
3
RSP1
RSN1
DRV1
GND2
VDD
V8
V4
DRV2
RSN2
RSP2
3
4
C4
C5
C6
5
R1
L1
D1
M1
M2
D2
R3
R4
Title
Size
A4
Date:
File:
L2
Num be r
R2
Revision
2014/09/12
C:\Users\..\AP3603_140912.SchDoc
4
5
Sheet of
Drawn By :
6
Vin
C1 A
Vout
C2
B
C
D
6
Dual Phase Application
Applications
Power Amplifier
Booster 200W class
Booster 400W class
Input
Voltage
12V
6.4V
6.4V
Output
Voltage
20V
12V
12V
Output
Current
CH-1 7.5A
CH-2 7.5A
CH-1 17A
CH-2 17A
34A
Output
Power
CH-1 150W
CH-2 150W
CH-1 204W
CH-2 204W
400W
Circuit
Dual Output
Dual Output
Dual Phase Single Output
015000004-E-02
-1-
2015/07
1 page  
[AP3603]
■ Functions
No. Pin Name I/O
Function
External Synchronous Pin
1 FSYN I This pin switches boost N-channel MOSFET of CH1 ON, synchronizing the falling
edge of input clock. The pin is pulled-up by 10uA constant current internally.
PWM Frequency Setting Pin
2 RT I Connect the resistor to GND1 for setting the PWM frequency.
Refer 12.2 Operational Frequency Setting to calculate the resistance.
CH1 Output Voltage Feedback Pin
3
FB1
I
Output voltage is controlled so that FB1 pin voltage becomes 3.6V. Connect the
feedback resistance between the positive side of output capacitor and GND1, and
voltage divide node of feedback resistance should be connected to FB1 pin.
CH1 Error Amplifier Output Pin
4 CC1 O Connect the resistance and capacitor in parallel between CC1 pin and SS pin to
compensate phase stability.
Signal Ground Pin
5 GND1 - Connect GND2 at just below the AP3603 to prevent potential difference between
this pin and the GND2 pin.
CH1 and CH2 Soft Start Pin
6 SS O Connect a capacitor between SS pin and GND to set the soft start time. When the
capacitor value is 0.1uF, the soft start time becomes 12ms.
CH2 Error Amplifier Output Pin
7 CC2 O Connect the resistance and capacitor in parallel between CC2 pin and SS pin to
compensate phase stability.
CH2 Output Voltage Feedback Pin
Connect the feedback resistance between the positive side of output capacitor and
8 FB2 I GND1 during dual output application usage. Voltage divide node of feedback
resistance should be connected to FB2 pin.
Connect this pin to FB1 pin at the dual phase single output application usage.
Power On Signal Input Pin
9 PWON I After “H” signal input, the internal voltage source V5 is powered up and then the
start-up sequence is initiated.
Maximum On Duty Set Pin
10 MDC O Set the maximum on time by the external resistance connecting between MDC and
GND1.
11 RSP2 I CH2 Current Detect Positive Pin
12 RSN2 I CH2 Current Detect Negative Pin
13 DRV2 O CH2 N-channel MOSFET Drive Pin
V4 Linear Regulator Output Pin
14 V4 O Middle voltage node of boost driver. Connect MLCC 0.22μF or more between V4
pin and GND2 to stabilize the internal voltage.
V8 Linear Regulator Output Pin
15 V8 O Power source of Boost driver. Connect MLCC 2.2μF or more between V8 and
GND2 to stabilize the internal voltage.
16 VDD - Main Power Source Pin
Power Ground Pin
17 GND2 - Connect the GND1 at just below the AP3603 to prevent potential difference between
this pin and the GND1 pin.
18 DRV1 O CH1 N-channel MOSFET Drive Pin
19 RSN1 I CH1 Current Detect Negative Pin
20 RSP1 I CH1 Current Detect Positive Pin
015000004-E-02
-5-
2015/07
5 Page 
[AP3603]
12. Application Information
12.1 Output Voltage Setting
Output voltage is settled by feedback resistors that are connected between the output capacitor and the GND.
The value of R3, R4 (output capacitor-FB pin) and R5, R6(FB pin-GND1) is calculated by the next
equations.
CH1Vout＝3.6 1 R3 [V]
R4
CH2 Vout＝3.6 1 R5 [V]
R6
12.2 Operational Frequency Setting
Operational frequency is settled by the resistor R7 between the RT pin and the GND. The value of the
resistor is calculated by the next equations.
R7＝
0.5
Frequency Hz
3.2p
1.2V
F1.5V
4
[ Ω]
12.3 Maximum ON Duty Setting
Maximum On duty is settled by the resistor between MDC pin and GND. The value of the resistor is
calculated by the next equations.
RMDC [Ω]
Duty(typ) [%]
10k 60%
27k 70%
47k 80%
82k 90%
127k or more
(Note 6)
Note 6. Maximum ON duty is fixed by the operational frequency and minimum off time 250ns (typ). If
f>250kHz, duty may be limited by the minimum off time of the IC.
Max Duty＝(1 250ns Frequency)100 [ ％]
12.4 Maximum Output Voltage
The maximum output voltage depends on maximum ON duty. It is estimated by the next equation.
Max Vout＝ Vin [ V]
1.1 Duty
015000004-E-02
- 11 -
2015/07
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AP3603.PDF ] | |
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