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参数资料
| 型号： | TK61220AQ4 |
| 厂商： | TOKO INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, QCC24 |
| 封装： | 4 X 4 MM, HQFN-24 |
| 文件页数： | 12/23页 |
| 文件大小： | 342K |
| 代理商： | TK61220AQ4 |
TK61220AQ4
GC3-N008B
Page 2
2 Channel Step-up DC-DC Converter IC for White LED Driver
TK61220AQ4
1. DESCRIPTION
The TK61220AQ4 is a 2ch step-up DC-DC converter
White LED driver IC. The IC has 2 independent step-up
circuits that drive 2 external MOSFETs allowing many
LEDs per channel.
If ch1 stops operating due to an open in the ch1 LED
string, ch2 will continue to operate and vise versa. Each
channel is independently driven with the appropriate
voltage increasing efficiency and reducing overall heat
generation.
LED brightness control is available using PWM dimming
or bias current dimming. UVLO, over-voltage protection
circuit, FET over-current protection circuit and LED
over-current protection circuit are built in. An external
resistor and capacitor can set oscillator frequency.
2. FEATURES
Each channel can be operated independently
External n-channel power MOSFET
Bias current dimming, PWM dimming
Oscillator frequency, Max 2.2MHz
Maximum duty cycle can be set
Synchronize parallel operation between two or more
ICs
UVLO, over-voltage, FET over-current, LED over-
current protection
Non-lead small package less than 1.0mm
3. APPLICATIONS
LED backlight for displays
General Illumination, White LED driver
Step up DC-DC converter
4. PIN CONFIGURATION
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
PGND
IS2
FB2
OVP2
EAOUT2
DIM
CT
SW1
VDD
IS1
FB1
OVP1
EAOUT1
EN1
EN2
RT
DTC
REF
PGOOD1
PGOOD2
PVIN2
SW2
PVIN1
AGND
5. BLOCK DIAGRAM
1
2
3
4
5
24
23
22
21
SW2
OSC
PGND
IS2
FB2
OVP2
EAOUT2
DIM
CT
SW1
VDD
IS1
FB1
OVP1
EAOUT1
EN1
EN2
OSC1
PWM COMP2
DRIVER 2
OVP AMP2
DIM
FET CURRENT
SENSE2
PWM COMP1
DRIVER 1
OVP AMP1
ERROR AMP1
LED CURRENT
SENSE1
FET CURRENT
SENSE1
11
17
16
15
14
20
RT
DTC
REF
DIMMING
CONTROL
TIMMER LACH1
TIMMER LACH2
DIM
6
13
T-LACH1
0.1V
T-LACH1
1.5V
T-LACH1
DRIVER1
LED CURRENT
SENSE1
FET CURRENT
SENSE1
0.7V
0.5V
PGOOD1
DRIVER1
DRIVER2
LED
CURRENT
SENSE2
FET
CURRENT
SENSE2
DRIVER2
T-LACH2
0.1V
1.5V
0.7V
T-LACH2
LED CURRENT
SENSE2
EAOUT2
EAOUT1
PGOOD2
ERROR AMP2
DIM T-LACH2
12
19
PVIN2
V
REF(2.5V)
UVLO
TEMP
ENABLE
18
7
8
9
10
1ch
OSC
DIMMING
CONTROL
2ch
EN1 EN2
OSC2
OSC1
OSC2
SW2
PVIN1
OVP2
OVP1
AGND
T-LACH1
T-LACH2
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