TB62757FUG [MARKTECH]
Interface Circuit;
| 型号： | TB62757FUG |
| 厂家： | 
MARKTECH CORPORATE |
| 描述： | Interface Circuit 信息通信管理 开关 光电二极管 |
| 文件： | 总20页 (文件大小：559K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TB62757FUG
TOSHIBA BiCD Digital Integrated Circuit Silicon Monolithic
TB62757FUG
Step Up Type DC/DC Converter for White LED
The TB62757FUG is a high efficient Step-Up Type DC/DC
Converter specially designed for constant current driving of
White LED.
This IC can drive 2 to 6 white LEDs connected series using a
Li-ion battery.
This IC contains N-ch MOS-FET Transistor for Coil-Switching,
and LED Current (I ) is set with an external resistor.
F
This IC is especially for driving back light white LEDs in LCD
of PDA, Cellular Phone, or Handy Terminal Equipment.
This device is Pb-free product.
Weight: 0.016 g (typ.)
Features
•
•
•
•
•
Can drive 2 to 6 white LEDs connected series
Variable LED current I is set with a external resistor: 20 mA (typ.) @R
F
= 16 Ω
SENS
Output power: Available for 400 mW LED loading
High efficiency: 87% @Maximum
Output over voltage shutdown function:
Switching operation is shut downed when OVD terminal voltage is over 22 V (typ.).
•
•
IC package: SSOP6-P-0.95
Switching frequency: 1.1 MHz (typ.)
Company Headquarters
3 Northway Lane North
Latham, New York 12110
Toll Free: 800.984.5337
Fax: 518.785.4725
California Sales Office:
950 South Coast Drive, Suite 265
Costa Mesa, California 92626
Toll Free: 800.984.5337
Web: www.marktechopto.com | Email: info@marktechopto.com
Fax: 714.850.9314
2006-02-206
1
TB62757FUG
Block Diagram
SW
4
OVD
2
Over voltage
detection
V
IN
3
Monostable
multivibrator
for
Monostable
multivibrator
for
reference
off time control
CTL
AMP.
Circuit
on/off
6 FB
Error
AMP.
SHDN
1
5
GND
Pin Assignment (top view)
1
2
3
6
5
4
SHDN
OVD
FB
GND
SW
V
IN
Note 1: This IC could be destroyed in some case if amounted in 180° inverse direction.
Please be careful about IC direction in mounting.
Pin Function
Pin No.
Symbol
Function Description
Voltage-input terminal for IC-enable.
1
SHDN
SHDN = H → Operation Mode, SHDN = L → Shutdown Mode (IC shutdown)
Please do not open this terminal.
Over voltage detection terminal.
2
OVD
IC switching operation is disabled with detection over voltage.
If the voltage returns to detection level or less, operation is enabled again.
3
4
5
6
V
Supply voltage input terminal. (2.8 V to 5.5 V)
Switch terminal for DC/DC converter. Nch MOSFET built-in.
Ground terminal.
IN
SW
GND
FB
LED I setting resister connecting terminal.
F
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TB62757FUG
I/O Equivalent Pin Circuits
Terminal
1.
2. OVD Terminal
SHDN
V
IN
OVD
2
SHDN
1
3. V Terminal to GND Terminal
4. SW Terminal
IN
V
IN
SW
4
3
GND
5
5. FB Terminal
V
IN
FB
6
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TB62757FUG
Application Note
V
IN
4.7 to 10 µH
SW
4
Over voltage
detection
2
3
V
IN
OVD
Monostable
multivibrator
for
Monostable
multivibrator
for
reference
off time control
CTL
AMP.
Circuit
on/off
6
Error
AMP.
FB
SHDN
PWM
1
5
GND
Protection in LED Opened Condition (OVD Function)
The operation with OVD terminal is available for the protection in case LED Circuit opened.
If load of LED is detached, Nch MOS switching operation is disabled with detection of boost circuit voltage.
(* When the voltage value recovers below the detection voltage value, operation is restarted.)
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TB62757FUG
Setting of External Capacitor
In case not using PWM signal to SHDN terminal for brightness control, recommended values are
C = Over 2.2 (µF), C = Over 1.0 (µF)
1
2
In case with PWM signal to SHDN terminal for brightness control, recommended values are
C = Over 4.7 (µF), C = Under 0.1 (µF).
1
2
The recommended capacitor values depend on the Brightness Control Method.
<Please refer the next page or later>
The capacitor value must be considered for gain enough accuracy of brightness with reduction of noise from Input
current changing.
Setting of External Inductor Size
Please select the inductor size with referring this table corresponding to each number of LEDs.
LEDs
Indictor Size
Note
2
3
4
5
6
4.7 µH
LED current I = 20 mA
6.8 µH
8.1 µH
10 µH
F
LED Current I Setting
F
The resistance between the FB pin and GND, R
(Ω) is the resistance for the setting the output current.
SENS
Depending on the resistance value, it is possible to set the average output current Io (mA).
The average output current Io (mA) can be approximated with the following equation:
I
F
= (325 [mV]/R
[Ω])
SENS
The current value error is ±5%.
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TB62757FUG
Brightness Control Method
Recommended Brightness Control Circuits are 4 types.
1) Input PWM signal to SHDN terminal
I can be adjusted with PWM signal by inputting it to SHDN terminal.
F
[Notice]
<<Minimum ON-time of PWM signal input>>
•
Set the minimum ON-time or OFF-time 33 µs or more in inputting the PWM signal.
•
Set the Duty ratio satisfying the condition above.
Ex) In case PWM Frequency is 1 kHz,
1 kHz is 1 ms (PWM Width = 100%) and it takes 10 µs per 1%.
To set the pulse width 33 µs or more, necessary ON-or-OFF-time is calculated below.
33 µs ÷ 10 µs = 3.3% (Under the condition that 10 µs equals 1%.)
Finally, the Duty Ratio can be set in range of 3.3% to 96.7%.
Set On-time
33 µs or more = 3.3%
Available Duty Ratio
(3.3% to 96.7%)
1 ms (1 kHz) = 100%
Set Off-time
33 µs or more = 3.3%
<<PWM signal frequency>>
•
The recommended PWM signal frequency is from 100 Hz to 10 kHz. There is a possibility to arise
the audible frequency in mounting to the board because it is within the auditory area.
<<Constant number of external capacitor>>
•
To reduce the fluctuation of input current and increase the accuracy of brightness, the values that
C = 4.7 (µF) or more, C = 0.1 (µF) or less are recommended.
1
2
•
When the PWM signal is off, the time to drain C of charge depends on the constant number. And
2
so, the actual value is little different from the theoretical value.
<<PWM input signal>>
•
Set the amplitude of PWM signal within the range of SHDN terminal specification.
<<Rush current in inputting>>
•
In case dimming by inputting the PWM signal to the SHDN terminal, this IC turns on and off
repeatedly.
And the rush current, which provides the charge to C , arises in turning on. Take care in selecting
2
the condenser.
<<Current value in control with PWM: Ideal equation>>
325 [mV]× ON Duty [%]
(mA) =
I
F
[Ω]
R
SENS
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TB62757FUG
<Reference Data>
Condition: V = 3.6 V, L = 6.8 µH, 4LEDs, R
= 16 mΩ@Io = 20 mA
IN
SENS
(1) C = 4.7 µF, C = 0.1 µF
1
2
Wave Form
TB62757FUG
ON Duty width[%] V.S. Error with Ideal Value
SHDN
VOUT
25
20
15
10
5
500kHz
1kHz
2kHz
4kHz
8kHz
I
IN
12kHz
0
0
0
0
20
40
60
80
100
100
100
ON Duty width[%]
(2) C = 4.7 µF, C = 0.47 µF
1
2
Wave Form
Wave Form
Wave Form
TB62757FUG
ON Duty width[%] V.S. Error with Ideal Value
SHDN
VOUT
25
20
15
10
5
500kHz
1kHz
2kHz
4kHz
8kHz
I
IN
12kHz
0
20
40
60
80
ON Duty width[%]
(3) C = 4.7 µF, C = 1.0 µF
1
2
TB62757FUG
ON Duty width[%] V.S. Error with Ideal Value
SHDN
VOUT
25
20
15
10
5
500kHz
1kHz
2kHz
4kHz
8kHz
I
IN
12kHz
0
20
40
60
80
ON Duty width[%]
(4) C = 2.2 µF, C = 1.0 µF
1
2
TB62757FUG
ON Duty width[%] V.S. Error with Ideal Value
SHDN
VOUT
25
20
15
10
5
500kHz
1kHz
2kHz
4kHz
8kHz
I
IN
12kHz
0
0
20
40
60
80
100
ON Duty width[%]
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TB62757FUG
<<Recommended circuit>>
V
=
IN
2.8 to 5.5 V
6.8 µH
S-Di
V
CC
SW
SHDN
OVD
PWM signal
FB
GND
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TB62757FUG
2) Input analog voltage to FB terminal
I can be adjusted with analog voltage input to FB terminal.
F
This method is without repeating IC ON/OFF, and no need to consider holding rash current.
[Notice]
•
LED current value goes over 100% of the current set with R , if the input analog voltage is
SENS
between 0 V to 325 mV (typ.).
for ref.) Analog voltage = 0 to 2.2 V
About external parts value, please see recommended circuit.
Ratio with
Setting Current
Supply Voltage [V]
TB62757FUG
Analog Voltage Input to FB Terminal
No connect (OFF)
100%
140.0%
120.0%
100.0%
80.0%
60.0%
40.0%
20.0%
0.0%
0
116.0%
106.5%
95.4%
84.5%
73.6%
59.9%
48.4%
37.4%
26.6%
15.9%
5.8%
0.2
0.4
0.6
0.8
1
0
0.5
1
1.5
Input Voltage
2
2.5
1.2
1.4
1.6
1.8
2
2.2
0.0%
<<Recommended circuit>>
V
=
IN
2.8 to 5.5 V
6.8 µH
S-Di
V
CC
SW
SHDN
OVD
16 kΩ
FB
GND
Analog voltage
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TB62757FUG
3) Input PWM signal with filtering to FB terminal
I can be adjusted with filtering PWM signal using RC filter indicated in recommended circuit, because the
F
PWM signal can be regard as analog voltage after filtering.
This method is without repeating IC ON/OFF, and no need to consider holding rash current.
[Notice]
•
LED current value goes over 100% of the current set with R , if the input voltage after filtering is
SENS
between 0 V to 325 mV (typ.).
for ref.) Voltage during PWM Signal-ON = 2 V
About external parts value, please see recommended circuit.
Ratio with
Setting Current
Supply Voltage [V]
TB62757FUG
Input PWM signal filtered with R,C to the FB terminal
No connect (OFF)
100%
140.0%
120.0%
100.0%
80.0%
60.0%
40.0%
20.0%
0.0%
0
116.1%
105.3%
95.1%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
84.8%
74.6%
64.0%
0%
20%
40%
60%
80%
100%
PWM Duty(%)
53.8%
43.7%
34.0%
24.2%
13.3%
<<Recommended circuit>>
V
=
IN
2.8 to 5.5 V
6.8 µH
S-Di
V
CC
SW
SHDN
OVD
16 kΩ
FB
GND
PWM signal
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TB62757FUG
4) Input logic signal
I can be adjusted with Logic signal input as indicated in recommended circuit.
F
The Resistor connected the ON-State Nch MOS Drain and R
determines I .
F
SENS
Average of Setting Current Io (mA) is next, approximately.
I
F
= (325 [mV]/Sum of Resistor Value [Ω])
<<Recommended circuit>>
V
=
IN
2.8 to 5.5 V
6.8 µH
S-Di
V
SW
CC
SHDN
OVD
FB
GND
R1
R2
M2
M1
Logic signal
M1
M2
LED Current
325 [mV]
OFF
OFF
[Ω]
R
SENS
[Ω]×R1[Ω]
[Ω] + R1[Ω]
R
R
SENS
325 [mV] ×
325 [mV] ×
ON
OFF
ON
OFF
ON
SENS
[Ω]×R2[Ω]
[Ω] + R2[Ω]
R
SENS
R
SENS
[Ω]×R1[Ω]×R2[Ω]
R
SENS
[Ω]×R1[Ω] +
325 [mV] ×
ON
[Ω]×R2[Ω] + R1[Ω]×R2[Ω]
R
R
SENS
SENS
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TB62757FUG
Absolute Maximum Ratings (Ta = 25°C if without notice)
Characteristics
Power supply voltage
Symbol
Rating
Unit
V
−0.3 to +6.0
V
V
V
IN
Input voltage
−0.3 to + V + 0.3 (Note 1)
V
SHDN
IN
Switching terminal voltage
V (SW)
o
−0.3 to 24
0.41 (Device)
Power dissipation
Thermal resistance
P
W
D
0.47 (on PCB)
300 (Device)
260 (on PCB)
−40 to +85
−55 to +150
150
(Note 2)
R
°C/W
th (j-a)
Operation temperature range
Storage temperature range
Maximum junction temperature
T
opr
°C
°C
°C
T
stg
T
j
Note 1: However, do not exceed 6 V.
Note 2: Power dissipation must be calculated with subtraction of 3.8 mW/°C from Maximum Rating with every 1°C if
is upper 25°C. (on PCB)
T
opr
Recommended Operating Condition (Ta = −40°C to 85°C if without notice)
Characteristics
Power supply voltage
Symbol
Test Condition
Min
Typ.
Max
Unit
V
2.8
33
⎯
⎯
5.5
V
IN
SHDN terminal input pulse width
LED current (average value)
tpw
“H”, “L” duty width
⎯
µs
V
= 3.6 V, R
= 16 Ω
IN
SENS
I
⎯
20
⎯
mA
o1
4 white LEDs, Ta = 25°C
Electrical Characteristics (Ta = 25°C, V = 2.8 to 5.5 V, if without notice)
IN
Characteristics
Input voltage range
Symbol
Test Condition
Min
Typ.
Max
Unit
V
2.8
⎯
⎯
5.5
1.5
1.0
V
IN
Operating consumption current
Quiescent consumption current
I
I
(On)
(Off)
V
V
= 3.6 V, R
= 16 Ω
= 0 V
0.9
0.5
mA
µA
IN
IN
IN
SENS
= 3.6 V,
⎯
V
IN
SHDN
SHDN terminal “H” level input
voltage
⎯
1.3
⎯
V
V
V
V
IN
SHDNH
SHDNL
SHDN terminal “L” level input
voltage
⎯
0
⎯
0
0.4
10
V
SHDN terminal current
I
V
V
= 3.6 V,
= 3.6 V,
= 3.6 V or 0 V
= 3.6 V
−10
0.77
µA
V
V
SHDN
IN
IN
SHDN
SHDN
Integrated MOS-Tr switching
frequency
f
1.1
1.43
MHz
OSC
Sw terminal protection voltage
Switching terminal current
V
(SW)
(SW)
(SW)
⎯
⎯
⎯
25
400
0.5
⎯
⎯
V
o
oz
oz
I
I
⎯
⎯
mA
µA
mV
Switching terminal leakage current
FB terminal feedback voltage (VFB)
⎯
1
V
V
= 3.6 V, R
SENS
= 16 Ω, L = 6.8 µH
308
325
342
FB
∆V
IN
V
V
= 3.6 V center
= 3.0 to 5.0 V
IN
IN
FB terminal line regulation
−5
⎯
5
%
FB
OVD terminal voltage
V
⎯
19
22
23.5
1
V
OVD
OVD terminal leakage current
I
V
= 16 V
⎯
0.5
µA
OVDZ
OVD
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TB62757FUG
1. Application Circuit Example and Measurement Data (reference data)
V
=
IN
L
1
S-Di
2.8 to 5.5 V
• Evaluation conditions (Ta = 25°C)
L
1
: CXLD120 series (NEO MAX CO.,Ltd.)
(Size: 2.5 mm × 3.0 mm × 1.2 mm)
: C2012JB1E225K (TDK Corp.)
V
SW
WLEDs
2 to 6
IN
SHDN
OVD
C
C
1
: C2012JB1E105K (TDK Corp.)
2
S-Di
: CUS02 1 A/30 V (TOSHIBA Corp.)
FB
GND
WLEDs: NSCW215T (NICHIA Corp.)
Input Voltage
-
Efficiency/Output Current
Input Voltage
- Efficiency/Output Current
2LED Drive, L=4.7µH
5LED Drive, L=10µH
35
100
90
80
70
60
50
35
30
25
20
15
10
100
90
80
70
60
50
30
25
20
15
10
Efficiency
I
I
Efficiency
F
F
2.8
2.8
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
VIN(V)
VIN(V)
Input Voltage
-
Efficiency/Output Current
Input Voltage
- Efficiency/Output Current
3LED Drive, L=6.8µH
6LED Drive, L=10µH
35
30
25
20
15
10
100
90
80
70
60
50
35
30
25
20
15
10
100
90
80
70
60
50
I
I
I
Efficiency
F
F
Efficiency
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
VIN(V)
VIN(V)
<Measurement Data>
Input Voltage
- Efficiency/Output Current
Efficiency in the range of V = 2.8 to 5.5 V
IN
4LED Drive, L=6.8µH
35
30
25
20
15
10
100
90
80
70
60
50
Efficiency (%)
Average Efficiency (%)
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
82.60 to 88.46
82.69 to 87.78
80.73 to 86.22
80.73 to 87.28
79.78 to 85.55
86.29
85.95
83.05
83.45
81.15
I
I
Efficiency
F
Output current in the range of V = 3.0 to 5.0 V (V = 3.6 V typ.)
IN
IN
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Tolerance (%)
Output Current (mA)
VIN(V)
V
= 3.6 V
IN
Min
Max
1.77
1.38
1.11
1.15
1.28
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
21.13
20.60
20.87
20.06
19.90
−3.50
−1.95
−1.75
−1.81
−1.95
* V
voltage in driving 5 or 6 LEDs must be lower
OUT
than OVD detection level. (V
< 19 V)
OUT
Note: These application examples are provided for reference only. Thorough evaluation and testing should be
implemented when designing your application’s mass production design.
2006-02-206
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TB62757FUG
2. Application Circuit Example and Measurement Data (reference data)
V
=
IN
L
1
S-Di
2.8 to 5.5 V
• Evaluation conditions (Ta = 25°C)
: 1001AS series (TOKO, INC)
L
1
V
SW
WLEDs
2 to 6
IN
(Size: 3.6 mm × 3.6 mm × 1.2 mm)
: C2012JB1E225K (TDK Corp.)
: C2012JB1E105K (TDK Corp.)
: CUS02 1 A/30 V (TOSHIBA Corp.)
SHDN
OVD
C
C
1
2
S-Di
FB
GND
WLEDs: NSCW215T (NICHIA Corp.)
Input Voltage
-
Efficiency/Output Current
Input Voltage
- Efficiency/Output Current
2LED Drive, L=4.7µH
5LED Drive, L=10µH
35
100
90
80
70
60
50
35
30
25
20
15
10
100
90
80
70
60
50
30
25
20
15
10
I
Efficiency
F
I
I
F
Efficiency
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
VIN(V)
VIN(V)
Input Voltage
-
Efficiency/Output Current
Input Voltage
- Efficiency/Output Current
3LED Drive, L=6.8µH
6LED Drive, L=10µH
35
30
25
20
15
10
100
90
80
70
60
50
35
30
25
20
15
10
100
90
80
70
60
50
I
I
F
Efficiency
I
Efficiency
I
F
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
VIN(V)
VIN(V)
<Measurement Data>
Input Voltage
- Efficiency/Output Current
Efficiency in the range of V = 2.8 to 5.5 V
4LED Drive, L=6.8µH
IN
35
30
25
20
15
10
100
90
80
70
60
50
Efficiency (%)
Average Efficiency (%)
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
83.10 to 88.60
81.32 to 86.47
79.15 to 84.63
79.72 to 86.39
78.91 to 85.10
86.55
84.54
81.30
82.87
80.47
I
I
F
Efficiency
Output current in the range of V = 3.0 to 5.0 V (V = 3.6 V typ.)
IN
IN
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Tolerance (%)
Output Current (mA)
VIN(V)
V
= 3.6 V
IN
Min
Max
1.73
1.38
1.15
1.22
1.26
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
21.17
20.85
20.56
20.10
19.95
−3.32
−1.95
−1.79
−1.82
−1.94
* V
voltage in driving 5 or 6 LEDs must be lower
OUT
than OVD detection level. (V
< 19 V)
OUT
Note: These application examples are provided for reference only. Thorough evaluation and testing should be
implemented when designing your application’s mass production design.
2006-02-206
14
TB62757FUG
3. Application Circuit Example and Measurement Data (reference data)
V
=
IN
L
1
S-Di
2.8 to 5.5 V
• Evaluation conditions (Ta = 25°C)
: LQH2M series
L
1
V
SW
WLEDs
2 to 6
IN
(Murata Manufacturing Co.,Ltd.)
(Size: 2.0 mm × 1.6 mm × 0.95 mm)
: C2012JB1E105K (TDK Corp.)
: C2012JB1E105K (TDK Corp.)
: CUS02 1 A/30 V (TOSHIBA Corp.)
SHDN
OVD
C
C
1
FB
2
GND
S-Di
WLEDs: NSCW215T (NICHIA Corp.)
Input Voltage
-
Efficiency/Output Current
Input Voltage
- Efficiency/Output Current
2LED Drive, L=4.7µH
5LED Drive, L=10µH
35
100
90
80
70
60
50
35
30
25
20
15
10
100
90
80
70
60
50
30
25
20
15
10
I
I
F
E
Efficiency
I
I
F
E
Efficiency
2.8
2.8
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
VIN(V)
VIN(V)
Input Voltage
-
Efficiency/Output Current
Input Voltage
- Efficiency/Output Current
3LED Drive, L=6.8µH
6LED Drive, L=10µH
35
30
25
20
15
10
100
90
80
70
60
50
35
30
25
20
15
10
100
90
80
70
60
50
I
I
F
E
Efficiency
I
I
Efficiency
F
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
VIN(V)
VIN(V)
<Measurement Data>
Input Voltage
- Efficiency/Output Current
Efficiency in the range of V = 2.8 to 5.5 V
4LED Drive, L=6.8µH
IN
35
30
25
20
15
10
100
90
80
70
60
50
Efficiency (%)
Average Efficiency (%)
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
82.37 to 88.70
80.19 to 86.55
78.11 to 84.54
74.79 to 84.94
74.14 to 83.47
86.38
84.12
80.16
79.94
77.17
I
Efficiency
I
F
Output current in the range of V = 3.0 to 5.0 V (V = 3.6 V typ.)
IN
IN
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Tolerance (%)
Output Current (mA)
VIN(V)
V
= 3.6 V
IN
Min
Max
1.69
2.17
1.01
1.25
1.07
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
21.19
20.90
20.63
20.09
19.93
−3.26
−1.87
−1.78
−1.88
−1.99
* V
voltage in driving 5 or 6 LEDs must be lower
OUT
than OVD detection level. (V
< 19 V)
OUT
Note: These application examples are provided for reference only. Thorough evaluation and testing should be
implemented when designing your application’s mass production design.
2006-02-206
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TB62757FUG
4. Application Circuit Example and Measurement Data (reference data)
V
=
IN
L
1
S-Di
2.8 to 5.5 V
• Evaluation conditions (Ta = 25°C)
: VLF3010A series (TDK Corp.)
L
1
V
SW
WLEDs
2 to 6
IN
(Size: 3.0 mm × 3.0 mm × 1.0 mm)
: C2012JB1E225K (TDK Corp.)
: C2012JB1E105K (TDK Corp.)
: CUS02 1 A/30 V (TOSHIBA Corp.)
SHDN
OVD
C
C
1
2
S-Di
FB
GND
WLEDs: NSCW215T (NICHIA Corp.)
Input Voltage - Efficiency/Output Current
2LED Drive, L=4.7µH
Input Voltage
- Efficiency/Output Current
5LED Drive, L=10µH
35
100
90
80
70
60
50
35
30
25
20
15
10
100
90
80
70
60
50
30
25
20
15
10
I
I
F
Efficiency
I
F
Efficiency
2.8
2.8
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
VIN(V)
VIN(V)
Input Voltage
-
Efficiency/Output Current
Input Voltage
- Efficiency/Output Current
3LED Drive, L=6.8µH
6LED Drive, L=10µH
35
30
25
20
15
10
100
90
80
70
60
50
35
30
25
20
15
10
100
90
80
70
60
50
II
F
Efficiency
I
F
Efficiency
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
VIN(V)
VIN(V)
<Measurement Data>
Input Voltage
- Efficiency/Output Current
Efficiency in the range of V = 2.8 to 5.5 V
4LED Drive, L=6.8µH
IN
35
30
25
20
15
10
100
90
80
70
60
50
Efficiency (%)
Average Efficiency (%)
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
79.85 to 86.97
80.19 to 85.32
78.77 to 83.60
79.72 to 86.39
78.91 to 85.10
84.02
83.39
80.69
82.87
80.49
I
Efficiency
I
F
Output current in the range of V = 3.0 to 5.0 V (V = 3.6 V typ.)
IN
IN
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Tolerance (%)
Output Current (mA)
VIN(V)
V
= 3.6 V
IN
Min
Max
1.67
1.33
1.11
1.22
1.26
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
21.19
20.89
20.64
20.10
19.95
−3.08
−1.86
−1.68
−1.82
−1.94
* V
voltage in driving 5 or 6 LEDs must be lower
OUT
than OVD detection level. (V
< 19 V)
OUT
Note: These application examples are provided for reference only. Thorough evaluation and testing should be
implemented when designing your application’s mass production design.
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TB62757FUG
5. Application Circuit Example and Measurement Data (reference data)
V
=
IN
L
1
S-Di
2.8 to 5.5 V
• Evaluation conditions (Ta = 25°C)
: 32R51 (KOA Corp.)
L
1
V
SW
WLEDs
2 to 4
IN
(Size: 3.2 mm × 2.5 mm × 0.6 mm)
: C2012JB1E225K (TDK Corp.)
: C2012JB1E105K (TDK Corp.)
: CUS02 1 A/30 V (TOSHIBA Corp.)
SHDN
OVD
C
C
1
2
S-Di
FB
GND
WLEDs: NSCW215T (NICHIA Corp.)
Input Voltage - Efficiency/Output Current
2LED Drive, L=5.1μH
Input Voltage - Efficiency/Output Current
3LED Drive, L=5.1μH
35
30
25
20
15
10
100
90
80
70
60
50
35
30
25
20
15
10
100
90
80
70
60
50
I
F
I
I
F
Efficiency
Efficiency
E
2.8
3.1
3.4
3.7
4
4.3
VIN(V)
4.6
4.9
5.2
5.5
2.8
3.1
3.4
3.7
4
4.3
VIN(V)
4.6
4.9
5.2
5.5
<Measurement Data>
Input Voltage - Efficiency/Output Current
4LED Drive, L=5.1μH
Efficiency in the range of V = 2.8 to 5.5 V
IN
35
30
25
20
15
10
100
90
80
70
60
50
Efficiency (%)
Average Efficiency (%)
2 LEDs
3 LEDs
4 LEDs
83.08 to 89.23
79.02 to 86.30
75.75 to 83.83
86.73
83.52
80.78
Output current in the range of V = 3.0 to 5.0 V (V = 3.6 V typ.)
I
IN
IN
F
Efficiency
Tolerance (%)
Output Current (mA)
V
= 3.6 V
IN
Min
Max
4.02
2.94
2.65
2.8
3.1
3.4
3.7
4
4.3
VIN(V)
4.6
4.9
5.2
5.5
2 LEDs
3 LEDs
4 LEDs
21.06
20.57
20.22
−2.46
−2.39
−2.28
Note: These application examples are provided for reference only. Thorough evaluation and testing should be
implemented when designing your application’s mass production design.
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TB62757FUG
Package Dimensions
Weight: 0.016 g (typ.)
2006-02-206
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TB62757FUG
Notes on Contents
Block Diagrams
Some functional blocks, circuits, or constants may be omitted or simplified in the block diagram for
explanatory purposes.
Equivalent Circuitry
Some parts of the equivalent circuitry may have been omitted or simplified for explanatory purposes.
Maximum Ratings
The absolute maximum ratings of a semiconductor device are a set of specified parameter values that must
not be exceeded during operation, even for an instant.
If any of these ratings are exceeded during operation, the electrical characteristics of the device may be
irreparably altered and the reliability and lifetime of the device can no longer be guaranteed.
Moreover, any exceeding of the ratings during operation may cause breakdown, damage and/or degradation in
other equipment. Applications using the device should be designed so that no maximum rating will ever be
exceeded under any operating conditions.
Before using, creating and/or producing designs, refer to and comply with the precautions and conditions set
forth in this document.
Application Examples
The application examples provided in this data sheet are provided for reference only. Thorough evaluation
and testing should be implemented when designing your application’s mass production design.
In providing these application examples, Toshiba does not grant the use of any industrial property rights.
Handling of the IC
Ensure that the product is installed correctly to prevent breakdown, damage and/or degradation in the
product or equipment.
Short circuiting between output and line to ground faults may result in damage to the IC. Please exercise
precaution in designing the output line, power line and GND line so as to prevent such damage.
Be careful to insert the IC correctly. Inserting the IC the wrong way (e.g., wrong direction) may result in
damage to the IC.
Please exercise precaution in handling external components as shorting and opening such components may
cause an overcurrent, which in turn may result in power overcurrent and/or in damage to the IC.
Overcurrent and Thermal Protection
Toshiba does not guarantee that these protection functions will prevent damage to the product. These
functions are only intended as a temporary means of preventing output short circuiting and other abnormal
conditions.
If the guaranteed operating ranges of this product are exceeded, these protection functions may not function
as intended and this product might be damaged due to output short circuiting.
The overcurrent protection function is intended to protect this product from temporary short circuiting only.
Short circuiting that last for a long time may cause excessive stress and damage to this product.
2006-02-206
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TB62757FUG
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