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PDF CP6238 Data sheet ( Hoja de datos )
| Número de pieza | CP6238 | |
| Descripción | BOOST CONVERT CONTROL IC | |
| Fabricantes | ETC | |
| Logotipo |  |
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CP6238
BOOST CONVERT CONTROL IC
GENERAL DESCRIPTION
The CP6238 is a boost topology switching regulator control IC for battery-used applications
field. The CP6238 includes a totem-pole single output stage for driving NPN transistor or
N-MOS, high precision reference (0.5V) for comparing output voltage with feedback amplifier,
an internal dead-time control for controlling the minimum duty cycle, programmable soft start
with short circuit protection function and logic level control for operating mode or standby
mode.
FEATURES
Wide supply voltage operating range: 1.8 to 15V
Reference voltage precision: 2%
Low current consumption: Operation Mode 5.5mA
Standby-by Mode 1µA
High speed oscillator frequency: 1MHz max.
Programmable Soft Start function (SS)
Short Circuit Protection function(SCP)
Totem-pole output with adjustable on/off current
(for NPN transistors or n-channel MOSFET)
Logic level control stand-by mode function
Package: SOP8/TSSOP8
SOP8
TYPICAL APPLICATION
Digital Camera
PDA
Portable Equipment
1 page  
CP6238
DC ELECTRICAL CHARACTERISTICS(Ta=25 ,VCC=+2V, unless otherwise noted)
Under Voltage Lock-Out section (U.V.L.O.)
PARAMETER
SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Low threshold voltage
VLOW
--
- - 0.9 V
Upper threshold voltage
VUPPER
--
1.1 1.3 1.5
V
Soft Start section (S.S.)
PARAMETER
Input source current
Soft start threshold voltage
SYMBOL
ISS
VSST
TEST CONDITIONS
VSCP= 0V
--
MIN.
-1.5
0.8
TYP.
-1.0
0.9
MAX.
-0.7
1.0
UNIT
A
V
Short Circuit Protection section (S.C.P.)
PARAMETER
Input source current
S.C.P. threshold voltage
SYMBOL
ISCP
VSCP
TEST CONDITIONS
VSCP= 0V
--
MIN.
-1.5
0.7
TYP.
-1.0
0.8
MAX. UNIT
-0.7 A
0.9 V
Oscillator section
PARAMETER
Oscillation frequency
Frequency change with
voltage
Frequency change with
temperature
SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
f RT=3.0KΩ,CT=270pF 400 500 600 KHz
∆f / ∆V
VCC=2V to 15V
- 2 10 %
∆f / ∆T
Ta = 0 to 85
- 5 -%
Idle Period Adjustment section
PARAMETER
SYMBOL TEST CONDITIONS MIN.
Maximum duty cycle
TDUTY
RT=3.0kΩ, CT=270pF,
VFB=0.8V
75
TYP.
-
MAX. UNIT
85 %
Total device section
PARAMETER
Stand-by current
Average supply current
SYMBOL
ISTANDBY
IAVE
TEST CONDITIONS
Pin4 is open or VCC
RB=390Ω,VCC=0~20V
MIN.
-
-
TYP.
-
5.0
MAX. UNIT
1 µA
10 mA
5 Page 
CP6238
Under voltage lockout (UVLO)
The under voltage lockout circuits turn the output off and whenever the supply voltage drops
too low (approximately 0.9V at 25 ) for proper operation. A hysteresis voltage of 200mV
eliminates false triggering on noise and chattering.
Soft Start/ Short-circuit protection (S.S. / S.C.P.)
The soft start is functional after power on, and the interval of soft start time is determined by a
capacitor connected to SCP pin (pin 2). When soft start function finished, the internal soft start
voltage is setting high, but external SCP pin is setting low in order to change to short circuit
detection / protection function.
The time of soft start is following expression:
Tss = 0.35 ∗C[µF ]
The short circuit protection is functional due to a heavy loading drop and output of error
amplifier (COMP pin) is maintain a VPOS (typ. 0.9V), the capacitor is charged until SCP
threshold voltage (typ. 0.8V), then CP6238 output is disable (internal pull-low) and the
capacitor is discharged to low.
The time of short circuit protection is following expression:
Tscp = 0.8 ∗ C[µF ]
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet CP6238.PDF ] | |
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