AP3616 Datasheet PDF - BCD Semiconductor

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AP3616
BCD Semiconductor

Part Number AP3616
Description 75mA CURRENT SINK
Page 16 Pages


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Data Sheet
SIXTEEN-CHANNEL, 75mA CURRENT SINK WITH CURRENT MATCH AP3616
General Description
Features
The AP3616 is an sixteen-channel constant current · Input Voltage Range: 4.2V to 27V
sink with current match used for LED driver. It uses an · Maximum Output Current: Typical 1.2A (75mA
external resistor to set the current for sixteen LED
per Channel)
strings with an accuracy of ±1.5%. The full scale LED
current can be adjusted from 20mA to 75mA for each
channel. The LED lightness can be adjusted by PWM
dimming function.
·
·
·
Current Match Accuracy (Typical): ±1.5%
PWM / Linear Dimming Control
Open LED Self-check and Protection
· Flexible Short LED Protection
The device can keep working normally without any · Under Voltage Lockout Protection
damage when LEDs are short or open. It features under · Over Temperature Protection
voltage lockout protection and over temperature pro- · FBX and SYN Pins Enable Parallel Application
tection.
· Over Voltage Protection
The AP3616 has three interface terminals (FB, SYN
and FBX pins). The FB and SYN pins allow the device
to work with a DC/DC converter to drive LED arrays
for good performance. And the FBX pin enables the
device to be connected in parallel.
The AP3616 is available in SOIC-28 and HSOP-28
packages.
Applications
· LCD Display Modules
· LCD Monitor
· LCD TV
Jul. 2012 Rev. 1. 2
SOIC-28
HSOP-28
Figure 1. Package Types of AP3616
BCD Semiconductor Manufacturing Limited
1



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Data Sheet
SIXTEEN-CHANNEL, 75mA CURRENT SINK WITH CURRENT MATCH AP3616
Pin Configuration
CH1 1
CH2 2
CH3 3
CH4 4
CH5 5
CH6 6
CH7 7
CH8 8
FLAG 9
FB 10
FBX 11
EN 12
VIN 13
GND 14
M Package
(SOIC-28)
28 CH9
27 CH10
26 CH11
25 CH12
24 CH13
23 CH14
22 CH15
21 CH16
20 OVP
19 SCP
18 SYN
17 SYNF
16 DIM
15 ISET
M28 Package
(HSOP-28)
CH1
CH2
CH3
CH4
CH5
CH6
CH7
1
2
3
4
5
6
7
28 CH16
27 OVP
26 SCP
25 SYN
24 SYNF
23 DIM
22 ISET
CH8
CH9
CH10
CH11
CH12
CH13
CH14
8
9
10
11
12
13
14
21 GND
20 VIN
19 EN
18 FBX
17 FB
16 FLAG
15 CH15
Figure 2. Pin Configuration of AP3616 (Top View)
Jul. 2012 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Data Sheet
SIXTEEN-CHANNEL, 75mA CURRENT SINK WITH CURRENT MATCH AP3616
Pin Description
Pin Number
SOIC-28
1 to 8
28 to 21
HSOP-28
1 to 8
9 to 15 & 28
9 16
10 17
11 18
12 19
Pin Name
Function
CH1 to CH8 White LED cathode connection pins. If not used, leave them uncon-
CH9 to CH16 nected
FLAG
Error flag pin. When LED load goes to error (short or open ), the flag
open drain output will close
Feedback pin. This pin is an interface terminal, which samples the
FB voltage of each channel, and outputs the lowest voltage of the string
to DC/DC converter
FBX
This pin is an interface terminal. Connect it to FB pin can achieve
parallel application. If not used, leave it unconnected
EN Enable pin. Logic high enables the IC and logic low disables the IC
13 20 VIN Input voltage pin
14 21 GND Ground pin
LED current setting pin. An external resistor is connected to this pin.
15
22
ISET
Current on each channel can be expressed by ICHAN-
NEL=1.194*1560/RISET
16
23
DIM
Dimming control pin. Adding a PWM signal or DC signal to this pin
to control LED dimming. Connect it to high voltage level if not used
Synchronous PWM frequency setting pin. A nF level of capacitor
17 24 SYNF should be connected to this pin to set PWM frequency at about 80Hz
to 25kHz
PWM dimming synchronous pin, this pin outputs DC transformed
18 25 SYN PWM signal to synchronize parallel AP3616 and power converter, if
not used, leave it unconnected
19
26
SCP
LED short trigger voltage setting pin. This pin is used to set the LED
short circuit protection voltage level
This pin is used to trigger OVP condition. OVP triggering voltage
20 27 OVP should be lower than the OVP voltage of its cascade chip, such as ,
AP3039A in Figure 19
Jul. 2012 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
3



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Data Sheet
SIXTEEN-CHANNEL, 75mA CURRENT SINK WITH CURRENT MATCH AP3616
Functional Block Diagram
CH1 1 1
88
28 9
CH16
21 15
&
28
CH1_IREF
x3120
PGND
x1
2µA
VDD
VDS1
x7
x1
AGND
AGND
Short
SCP Detection
200mV
Open
Detection
OVP_EN
SCP
VREF 1.194V
_ VDD
+
VDD=5V
+
_
0.26V
SCP Open
Detection
VREF
9(16)
FLAG
10(17)
FB
11(18)VCH 16 to 1
FBX
12(19)
EN
EN
VDS1=VDD
Latch
Block
Open LED
Short LED
VREF
UVLO
Bandgap
PWM
13µA
Q_BAR
RS SET
RESET
+ 2.2V
_
+
_ 0.5V
VDD
Regulator
13µA
x1 x4
x4
VIN 13(20)
14(21)
GND
AGND
PGND
CH_IREF 1 to 16
A(B)
A for SOIC-28
B fro HSOP-28
20(27)
OVP
19(26)
SCP
18(25)
SYN
16(23)
DIM
17(24)
SYNF
15(22)
ISET
Figure 3. Functional Block Diagram of AP3616
Jul. 2012 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
4



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