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Datasheet ELM650DA PDF ( 特性, スペック, ピン接続図 )

部品番号 ELM650DA
部品説明 CC/CV Mode 36V step down 2A DC/DC converter
メーカ ELM
ロゴ ELM ロゴ 
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ELM650DA Datasheet, ELM650DA PDF,ピン配置, 機能
ELM650DA CC/CV Mode 36V step down 2A DC/DC converter
General description
ELM650DA is a step down switching regulator, which has a built-in 40V P-channel power MOSFET for
delivering output current. ELM650A is designed to allow for operating a wide supply voltage range from 8V to
36V and capable of delivering 2A output current.
ELM650DA features programmable CV/CC mode control functions, the CV mode (Constant Voltage) function
to provide a regulated voltage output and the CC mode (Constant Current) function provide a current limitation
function, it is suitable for the DC/DC switching power applications when requested the current limitation
function.
■Features
• CC/CV mode control
• Soft start function for start-up
• Output over-voltage protection
• Over temperature protection
• Fold back short-circuit protection
• High efficiency operation
• Input voltage range
: 8V to 36V
• Input voltage surge
: 40V
• Fixed operating frequency
: 100kHz
• Voltage reference accuracy
: ±1%
• Current limit accuracy
: ±4%
• Package
: SOP-8
■Application
• Car charger
• Portable charger applications
• DC/DC converters with current limited
• General purpose CV/CC power supply
■Maximum absolute ratings
Parameter
Symbol
Limit
VCC to GND
Vcc -0.3 to +40.0
LX to VCC
LX +0.3 to -40.0
VSEN to GND
Vsen
-0.3 to +7.0
ISEN+ to GND
ISEN+
-0.3 to +7.0
ISEN- to GND
ISEN-
-0.3 to +7.0
OVP to GND
OVP
-0.3 to +7.0
COMP to GND
COMP
-0.3 to +7.0
Output current
Icc 3
Power dissipation at Ta <60 °C
Pd
0.75
Operationg temperature
Top
-40 to +85
Storage temperature range
Tstg
-60 to 150
Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used.
Unit
V
V
V
V
V
V
V
A
W
°C
°C
■Selection guide
ELM650DA-N
Symbol
a Package
b Product version
c Taping direction
* Taping direction is one way.
D: SOP-8
A
N: Refer to PKG file
ELM650DA - N
↑↑ ↑
ab c
10 - 1
Rev.1.2

1 Page



ELM650DA pdf, ピン配列
ELM650DA CC/CV Mode 36V step down 2A DC/DC converter
■Standard circuit
Vin
+
C1
R1
C3
U1
6 VCC
LX 5
7 OVP ISEN+ 4
8 COMP ISEN- 3
C4 1 GND VSEN 2
ELM650DA
L1 R2
+
D1A C2
C5
R3
Vout
R5
R4 R6
GND
■Functional descriptions
1. CV/CC mode control
ELM650DA provides CV/CC function. The CV (constant voltage) function is implemented to deliver a regu-
lated output voltage for the output terminal, and the CC (constant current) function is to limit output current to
be a limited value to prevent the device damaged due to output short circuit or over current condition.
2. Soft start function
ELM650DA is composed of built-in internal soft start function to prevent a large surge current happening
when during start-up period due to the surge current charging output filter capacitors.
3. Output over-voltage protection
ELM650DA provides output over-voltage protection function. When output over-voltage happens, ELM650DA
shuts down and recovers to normal state automatically if output over-voltage is released.
4. Output short-circuit protection
ELM650DA provides output short-circuit protection function. When output short-circuit happens, ELM650DA
shuts down and recovers to normal state automatically if output short-circuit is released.
■Marking
SOP-8
Mark
650
a to o
Content
Product No.code
Assembly lot No.
10 - 3
Rev.1.2


3Pages


ELM650DA 電子部品, 半導体
ELM650DA CC/CV Mode 36V step down 2A DC/DC converter
2. CC current setting
The constant current value of ELM650DA is set by a Rs resistor which is connected between Isen+ and Isen-
pin. The output current of CC mode and Rs resistor are set by the following equation: Rs = 0.112 / ICC
Icc
Rs Vout
ELM650DA Isen+
Isen-
Fig-2 : Constant current mode setting
When output voltage is set over 6V, the voltage of the V(Isen+), V(Isen-) should be set under 6V by the follow-
ing equation: Visen± = (1/ks) Vout ≤ 6V, ks = (Rs1 + Rs2) / Rs2 = (Rs3 + Rs4) / Rs4
Also ks = (Rs1 + Rs2) / Rs2, and Rs = ks × 0.112/Icc at this time.
Rs Vout
Isen+
Isen-
Rs1
Rs3
Rs2 Rs4
Fig-3 : Constant current mode setting ( At Vout ≥ 6V )
3. Input capacitor selection
The bulk input capacitor selection is based on the voltage rating, the RMS current carrying capability, and the
required input voltage ripple.
The capacitor voltage rating is recommended with 1.5 times for the maximum input voltage as conservative
guideline, depending on the application condition.
The capacitor RMS current rating is considered for stress condition, and the trapezoid current waveform as the
simplified formula is described:
Irms = Iout(max) * √ ( Vout / Vin )
Vin = input voltage ; Vout = output voltage ; Iout(max) = maximum output current.
The capacitor values with respect to the required input voltage ripple if neglect ESR is described:
C = Iout(max) * ΔT / ΔV
ΔT = capacitor supplied charging time ; ΔV = allowable input voltage ripple.
10 - 6
Rev.1.2

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