CS2841B Datasheet, PDF (4/10 Pages) Cherry Semiconductor Corporation – Automotive Current Mode PWM Control Circuit

CS2841B
ELECTRICAL CHARACTERISTICS (−40°C ≤ T_A ≤ 85°C, R_T = 680 kW, C_T = 0.022 mF for Triangular Mode, V_CC = 15 V (Note 3),
R_T = 10 kW, C_T = 3.3 nF for Sawtooth Mode (see Figure 7); unless otherwise specified.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
Output Section
Output Low Level
I_SINK = 20 mA
I_SINK = 200 mA
−
0.1
0.4
V
−
1.5
2.2
V
Output High Level
Rise Time
Fall Time
Output Leakage
Total Standby Current
I_SOURCE = 20 mA
I_SOURCE = 200 mA
T_J = 25°C, C_L = 1.0 nF. Note 7
T_J = 25°C, C_L = 1.0 nF. Note 7
Undervoltage Active, V_OUT = 0
13
13.5
−
V
12
13.5
−
V
−
50
150
ns
−
50
150
ns
−
−0.01
−10
mA
Startup Current
−
−
0.5
1.0
mA
Operating Supply Current I_CC
V_FB = V_Sense = 0 V, R_T = 10 kW, C_T = 3.3 nF
−
Undervoltage Lockout Section
11
17
mA
Start Threshold
−
7.6
8.0
8.4
V
Min. Operating Voltage
After Turn On
7.0
7.4
7.8
V
7. These parameters, although guaranteed, are not 100% tested in production.
PACKAGE PIN DESCRIPTION
PACKAGE PIN #
PDIP−8
SOIC−14
1
1
PIN SYMBOL
COMP
2
3
V_FB
3
5
Sense
4
7
OSC
5
8
GND
9
Pwr GND
6
10
V_OUT
11
V_CC Pwr
7
12
V_CC
8
14
V_REF
2, 4, 6, 13
NC
FUNCTION
Error Amp Output, Used to Compensate Error Amplifier
Error Amp Inverting Input
Noninverting Input to Current Sense Comparator
Oscillator Timing Network with Capacitor to Ground, Resistor to V_REF
Ground
Output Driver Ground
Output Drive Pin
Output Driver Positive Supply
Positive Power Supply
Output of 5.0 V Internal Reference
No Connection
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