Datasheet
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G +
ǒ
DV
PIN7
Ǔ
ǒ
DV
PIN4
Ǔ
UC1846-EP
CURRENT-MODE PWM CONTROLLER
SGLS329 – MAY 2006
Electrical Characteristics (continued)
T
A
= –55 ° C to 125 ° C, V
IN
= 15 V, R
T
= 10 k, C
T
= 4.7 nF, T
A
= T
J
(unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Current-Sense Amplifier
Amplifier gain V
PIN3
= 0 V, Pin 1 open
(2) (3)
2.5 2.75 3 V
Maximum differential input signal
Pin 1 open,
(2)
R
L
(pin 7) = 15 kW 1.1 1.2 V
(V
PIN4
– V
PIN3
)
Input offset voltage V
PIN1
= 0.5 V, Pin 7 open
(2)
5 25 mV
CMRR V
CM
= 1 V to 12 V 60 83 dB
PSRR V
IN
= 8 V to 40 V 60 84 dB
Input bias current V
PIN1
= 0.5 V, Pin 7 open
(2)
–2.5 –10 µ A
Input offset current V
PIN1
= 0.5 V, Pin 7 open
(2)
0.08 1 µ A
Input common-mode range 0 V
IN
– 3 V
Delay to outputs T
J
= 25 ° C
(4)
200 500 ns
Current-Limit Adjust
Current-limit offset V
PIN3
= 0 V, V
PIN4
= 0 V, Pin 7 open
(2)
0.45 0.5 0.55 V
Input bias current V
PIN5
= V
REF,
V
PIN6
= 0 V –10 –30 µ A
Shutdown Terminal
Threshold voltage 250 350 400 mV
Input voltage range 0 V
IN
V
Minimum latching current (I
PIN1
)
(5)
3 1.5 mA
Maximum nonlatching current (I
PIN1
)
(6)
1.5 0.8 mA
Delay to outputs T
J
= 25 ° C
(4)
300 600 ns
Output
Collector-emitter voltage 40 V
Collector leakage current V
C
= 40 V 200 µ A
I
SINK
= 20 mA 0.1 0.4
Output low level V
I
SINK
= 100 mA 0.4 2.1
I
SOURCE
= 20 mA 13 13.5
Output high level V
I
SOURCE
= 100 mA 12 13.5
Rise time C
L
= 1 nF, T
J
= 25 ° C
(4)
50 300 ns
Fall time C
L
= 1 nF, T
J
= 25 ° C
(4)
50 300 ns
Undervoltage Lockout
Start-up threshold 7.7 8 V
Threshold hysteresis 0.75 V
Total Standby Current
Supply current 17 21 mA
(2) Parameter measured at trip point of latch with V
PIN5
= V
REF
, V
PIN6
= 0 V.
(3) Amplifier gain defined as:
where V
PIN4
= 0 to 1 V
(4) These parameters, although specified over the recommended operating conditions, are not 100% tested in production.
(5) Current into pin 1 is ensured to latch circuit in shutdown state.
(6) Current into pin 1 is ensured not to latch circuit in shutdown state.
5
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