POWER&RF
Step-up DC-DC converter
鏄囧湩鍨婦C-DC銈熾兂銉愩兗銈縄C
TK11880FTL-G
(SON3024-8)
DESCRIPTION
The TK11880FTL-G is a step-up DC-DC converter designed
for White LED driver applications, using constant frequency
PWM architecture, with the following built in: a very high
current switching transistor 0.6A peak), a high speed
oscillator (1.0MHz), a switch over current detector, a low
voltage reference (VRef=0.495V), an error amplifier, a PWM
comparator, a zener diode for open-circuit protection and
ON/OFF control.
TK11880FTL-G can drive up to six White LEDs in series.
This IC works with a very wide operation supply range
(2.65V~10V) and the adjustable output voltage can be set as
high as 24.5V. The white LEDs are connected in series and
driven at a constant current, resulting in uniform brightness
and high efficiency. The reference voltage is a very low
0.495V, achieving high efficiency operation with the constant
current output. The ON/OFF control is built-in and the circuit
current can be decreased when the EN pin is low (shutdown
mode). The built-in zener diode can be used for open-circuit
protection in case the output load is disconnected, such as
the string of LEDs opened. The internal zener diode reduces
the external component count.
The TK11880FTL-G can also be used in other applications
as a step-up DC-DC converter.
The TK11880FTL-G is available in the SON3024-8 surface
mount package.
TK11880FTL-G銇拷½鑹睱ED銈掋儔銉┿偆銉栥仚銈嬨仧銈併伀闁嬬櫤銇椼仧銆?/div>
PWM鏂瑰紡鏄囧湩鍨婦C-DC銈熾兂銉愩兗銈縄C銇с仚銆傜洿鍒椼伀鎺ョ稓銇曘倢
銇熸渶澶?鍊嬨伄錕?frac12;鑹睱ED銈掋儔銉┿偆銉栧嚭鏉ャ伨銇欍€傦拷½鑹睱ED鐩村垪鎺?/div>
綞氥€佸畾闆繪祦椐嗗嫊妲嬫垚銇с€佽紳搴︺儬銉┿亴灝戙仾銇忋€侀珮鍔圭巼銇у嫊錕?frac12;錕姐仐
銇俱仚銆傚熀婧栭浕鍦с伅0.5V銇拷½錕姐亸銆佸畾闆繪祦鍑哄姏銇ч珮鍔圭巼銇с仚銆傘仢
銇粬銆佷竴鑸殑銇槆鍦у瀷DC-DC銈熾兂銉愩兗銈褲仺銇椼仸銈傦拷½錕界敤鍙拷½
銇с仚銆?/div>
FEATURES
Very wide operating voltage range (2.65 to 10V)
1.0MHz operation
Internal switching transistor
Maximum duty cycle 93%
24.5v
MAX
output
Very small inductor available
Very small package SON3024-8
鍕曪拷½錕介浕鍦х瘎鍥?/div>
2.65 to 10V
鍕曪拷½錕藉懆娉㈡暟
1MHz
銈廣偆銉冦儊銉熾偘銉堛儵銉熾偢銈廣偪鍐呰數(shù)
鏈€澶с儑銉ャ兗銉嗐偅銉箋偟銈ゃ偗銉?/div>
93錛?/div>
鏈€澶у嚭鍔涢浕鍦?4.5V
灝忓瀷銈熾偆銉拷½錕界敤鍙拷½
0.75mm钖勫瀷銉戙儍銈便兗銈窼ON3024-8
ABSOLUTE MAXIMUM RATINGS
Parameter
Operating voltage range
Operating temperature range
Power dissipation
Operating frequency range
闋呯洰Symbol 璦樺彿Rating
瀹氭牸
V
OP
2.65 to 10.0
鍕曪拷½錕介浕鍦х瘎鍥?/div>
T
OP
-30 to +85
鍕曪拷½錕芥俯搴︾瘎鍥?/div>
璦卞娑堣不闆誨姏
P
D
600
鍕曪拷½錕藉懆娉㈡暟綃勫洸
f
OP
1.0
Unit
鍗橈拷½錕?/div>
Remarks
鍌欒€?/div>
V
擄C
mW
MHz
*Board mounted
鍩烘澘瀹熻鏅?/div>
ELECTRICAL CHARCTERISTICS
V
IN
=3V, T
A
=25
擄
C
Parameter
闋呯洰Symbol 璦樺彿
MIN.
Value
Unit
TYP. MAX.
鍗橈拷½錕?/div>
Conditions
鏉′歡
Oscillator section
鐧烘尟鍣ㄩ儴
f
0.7
1.0
1.3
Operating frequency
鍕曪拷½錕藉懆娉㈡暟
Error amplifier section (V
fb
pin, Ea
out
pin)
銈ㄣ儵銉箋偄銉熾儣閮?/div>
(V
FB
绔瓙,
EA
OUT
绔瓙)
MHz
2005 FALL
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