TB62D901FNG
TOSHIBA BiCD Integrated Circuit Silicon Monolithic
TB62D901FNG
AC/DC Step-Down Conversion Type LED Lighting Driver
1. General
The TB62D901FNG is a constant current driver IC ideal for
use in the step-down AC/DC conversion type LED lighting
applications.
The TB62D901FNG features architecture with automatic Off
time adjustment control that can be used to achieve minimum
LED current variations by the effect of fluctuated input voltage
or change of LED forward voltage.
The device allows linear dimming or PWM dimming. It has
extensive detection functions that are thermal shutdown,
over-current detection, over-voltage detection, under-voltage
lockout, and current sensing input terminal (ISEN1) open
detection.
TB62D901FNG
SSOP16-P-225-0.65B
Weight: 0.07 g (typ.)
2. Application
LED lighting
3. Features
•
Operating supply voltage
•
Dimming function
•
Switching frequency
•
Operation mode
: 12V to 30V
: Linear dimming (by adjustment of LED peak current)
PWM dimming
: Adjustable of up to 500kHz (MAX)
: Current continuous conduction mode
(
Automatic OFF time control mode, Fixed off time mode
)
Critical conduction mode
: 90% or more with recommended components
: Thermal shutdown (TSD)
: Over-current detection (OCP)
: Over-voltage detection (OVP)
: Under-voltage lockout (UVLO)
: ISEN terminal open detection (IOP)
: EN signal allows standby mode with 0.8mA (MAX) consumption
current
: T
opr
=
−40
°C to 105 °C
: SSOP16-P-225-0.65B
•
Efficiency
•
Detection function
•
IC standby function
•
Operating temperature
•
Package
1
2012-03-12
TB62D901FNG
4. Block Diagram
VCC
Vref
VREG
PWMD
LDO
UVLO
TSD
COMP
RC
EN
LD
REF
COMP
R
S
ISEN2
Q
LOGIC
OFF time
Control
VSEN
Gate
Driver
GATE
MS
ISEN2
PGND
OSC
PGND
ISEN
OPEN Protection
GND
ISEN1
2
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TB62D901FNG
5. Pin Assignment (top view)
VCC
VREG
MS
PWMD
LD
RC
EN
GND
1
2
3
4
5
6
7
8
16 PGND
15 GATE
14 ISEN1
13 ISEN2
12 VSEN
11 NC
10 NC
9
NC
6. Pin Description
Pin
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin
Name
VCC
VREG
MS
PWMD
LD
RC
EN
GND
NC
NC
NC
VSEN
ISEN2
ISEN1
GATE
PGND
I/O
P
O
I
I
I
I
I
P
-
-
-
I
I
I
O
P
Function
Power supply input.
Output of the internal regulator.
Input to set switching operation mode.
GND short-circuit: Continuous mode
VREG terminal short-circuit: Critical mode
PWM signal input for the PWM dimming.
“H" level voltage input: LED lighting current on
"L" level voltage input: LED lighting current off
Analogue input voltage to set the peak value of the LED current.
Analog input to set the ripple range of the LED current.
IC enable signal input.
“H" level voltage input: Operation mode
"L" level voltage input: Standby mode.
In standby mode, circuits other than the regulator circuit, the standard voltage circuit,
and the UVLO circuit stop operation.
Ground.
No Connect. Connect to GND
No Connect. Connect to GND
No Connect. Connect to GND
Input for feedback voltage.
This input voltage of VSEN determines the OFF time of the control output GATE for
external power MOSFET of the step-down driver.
Detection terminal for LED current.
Connect to the GND side of the current sensing resistor between ISEN1 and GND.
Detection terminal for LED current.
The peak value of LED current is determined by the resistance connected between
ISEN1 terminal and GND.
Output for controlling the Gate of the Power MOSFET
Power ground for GATE diver.
*I/O symbol I: Input, O: Output, P: Power supply
3
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TB62D901FNG
7. I/O Equivalent Circuits
Pin
No
Pin
Name
Pin
No
Pin
Name
Equivalent circuit
Equivalent circuit
1
VCC
8
GND
VREG VCC
2
VREG
13
PGND
PGND
GND
ISEN2
3
MS
16
ISEN2
5
LD
12
VSEN
6
RC
14
ISEN1
VCC
4
PWMD
15
GATE
PGND
PGND
7
EN
4
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TB62D901FNG
8. Absolute Maximum Ratings (T
a
= 25°C)
Characteristics
Supply voltage
Input pin voltage (PWMD, LD, RC, EN,
and MS)
VREG pin voltage
Feedback pin voltage
(ISEN1 and VSEN)
GATE pin voltage
Operating temperature
Storage temperature
Thermal resistance
Power dissipation
Symbol
V
CC
V
IN
V
REG
V
FB
V
GATE
T
opr
T
stg
R
th(j-a)
P
D
Rating Note1
−0.3
to 40
−0.3
to 6.0
−0.3
to 6.0
−0.3
to 6.0
−0.3
to V
CC
−40
to 105
−55
to 150
87.3* Note 2
1.43* Note2,3
Unit
V
V
V
V
V
°C
°C
°C/ W
W
Note1: Voltage is PGND/GND/ISEN2 referenced.
Note2: PCB condition is 76.2×114.3×1.6mm (JEDEC 4 layer substrate)
Note3: When ambient temperature is 25°C or more. Every time ambient temperature exceeded 1°C, please decrease 1/Rth(j-a).
9. Operating Condition (Unless otherwise noted, T
a
= -40 to 105 °C)
Characteristics
Operating supply voltage
Switching frequency
Symbol
V
CC
f
SW
V
LD1
LD pin input voltage
V
LD2
V
RC1
RC pin input voltage
V
RC2
V
VSEN1
V
VSEN2
When LED peak current adjustment
function is used
When
When
When
LED
LED
LED
peak
peak
peak
current
current
current
adjustment
adjustment
adjustment
function is not used
function is used
function is not used
When using it in automatic OFF time
control mode
When using it in Fixed OFF time mode
Test Conditions
Min
12
―
0.2
4.5
1
0
0.5
4.5
Typ.
―
―
―
―
―
―
―
―
Max
30
500
3.8
V
V
REG
4.0
V
0.5
3
V
REG
Unit
V
kHz
VSEN pin input voltage
V
GATE pin output voltage which is the same level as V
CC
. Please set up V
CC
in consideration of the Absolute Maximum Ratings of
the external power MOSFET
5
2012-03-12
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