Linear LED Driver
EC4216C
General Description
EC4216C is a Linear LED Driver of 6-segment LED switch, and its current of each segment in Pow=16V and VD=75V can provide 118mA by Sink. In addition, it contains simple application circuit, every few external components (e.g. a bridge rectifier external resistor and a 4.7uF capacitor are required only in use of 6 Watts)and Negative Temperature Coefficient Output.
Features
● ESOP8 package
● Simple application circuit
● Built-in 8V~18V Zener Diode Equivalent circuit, provides for internal circuit, without Start up HVNMOS, convenient for 110V/220V power use.
Applications
● LED Bulbs
Absolute Maximum Ratings
● IZ=10mA.
● Pow=16.5V.
● D1~D6 Break Down Voltage=700V at Pow=0V.
● Operating Temperature Range：-40℃ to 120℃
● Storage Temperature Range：-40℃ to 140℃
● ESD Level………………(H.B.M) 2KV
(M.M) 200V
Note:
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional Operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect device reliability.
Pin Configuration
Top View
Pin Number | Pin Name | Function |
1 | Pow | 8V~18V Power |
2 | D1 | Segment 1 Driver |
3 | D2 | Segment 2 Driver |
4 | D3 | Segment 3 Driver |
5 | D4 | Segment 4 Driver |
6 | D5 | Segment 5 Driver |
7 | D6 | Segment 6 Driver |
8 | Vref | 2.5V Reference & Set Power Voltage |
Exposed Pad | Gnd | Ground |
Ordering Information
EC4216C XX XX R
AA： R：Tape Reel
6 Segment without OVP Package：
MH：ESOP8
Part No. | Package Type | Marking Information | Remark |
EC4216CAMHR | ESOP8 | EC4216 LLLLAA YYWWT |
|
Electrical Characteristics TA = 25°C unless otherwise specified
Parameter | Symbol | Condition | Min | Typ | Max | Unit |
Power | Pow | R1=22k, VCC=30V, D1~D6 Open | 8.27 | 8.48 | 8.69 | V |
Reference Voltage | Vref | Pin8 Open | 2.54 | 2.61 | 2.68 | V |
Leak Current | ILeak | Pow=0V, V(D1~D6)=40V |
| 0.8 | 1.25 | uA |
Driver Current | ID | Pow=8.48V, VD=75V | 105 | 120 | 135 | mA |
Quiescent Current | IQ | R1=120k, D1~D6 Open, Vi=110Vrms |
| 0.75 |
| mArms |
Switch Segment Current | ISW | Pow=16V, DN+1 current (IDN+1)to turn off DN |
| 12 |
| mA |
Vref Input Resistor | Ri | Pow Open, Pin8 to Gnd Resistor |
| 88 |
| kΩ |
Channel Resistor | RON | VCC=30V, R3=∞, C1=4.7uF | 100 | 120 | 130 | Ω |
Functional Description
Traditional single-segment Linear LED Driver needs to use higher Driver LED Current in order to increase brightness when LED lights up, so the drawback is the low efficiency of LED. EC4216C is a six-segment Linear LED designed to improve the drawback of single-segment Drive LED. The six-segment switch LED Driver is to divide traditional single-segment LED into six segments, and then conducts segment by segment according to the input voltage changes (D1->D1+D2-> D1+D2+D3 …….). Such an arrangement can overcome the Forward bias of LED, allowing the LED to light up when the input voltage is low, and thus increase the efficiency of the LED, but also no Over Driver LED is required. EC4216C consists of two portions, one is Chip power; please refers to Application Circuit (Fig1). In the Application Circuit, an external resistor R3 is used to set the operating voltage of Chip and the output current for D1~D6. The set method is as follows: two resistors R9 (with value 192K) and R9A (with value 88k) are set between Chip Pin1 (Pow) and Pin8 (Vref), and a reference voltage 2.61V is on Pin8. The relationship among Pow, Vref, R9 and R9A is shown as formula 1.
Fig-1 110VRMS Application Circuit
Therefore, where the external resistor R3 does not exist (Default), R=88k, and Pow=8.47V, and where R=38.5k (R3=68k//R9A), the Pow=15.56V. The second portion includes Segment Switch Circuit and LED Current Driver. Six segments will be conducted sequentially according to Sine Wave changes. When Sine Wave is under positive slope changes, the conducting way is as follows: D1, D1+D2, D1+D2+D3, D1+D2+D3+D4, D1+D2+D3+D4+D5, and D1+D2+D3+D4+D5+D6, and when the Sine Wave is under negative slop changes, then the way is in the opposite direction. The switch of those segments is carried out by Segment Switch Circuit. The conditions to switch two segments is that where ID(N+1)≧12mA is closed, D(N) ....Segment is turned off. Drive Current is relevant to Pow voltage; in Default value, the external resistor R3 of application circuit does not exist, Pow=8.48V. Pow pin=0V 2V 4V 6V 8V 10V 12V 14V 16V which the maximum current of each Segment (D1~D6) is 120mA. As for the relationship between Drive Current and Pow, please refer to Fig2.
Fig2 D1~6 Drive Current with Pow pin
Outline Dimensions
ESOP8
